diff --git a/.mailmap b/.mailmap
index 96a4f257..7c9dc3d 100644
--- a/.mailmap
+++ b/.mailmap
@@ -7,3 +7,4 @@
 Shawn Pearce <spearce@spearce.org>           Shawn O. Pearce <sop@google.com>
 Shawn Pearce <spearce@spearce.org>           Shawn Pearce <sop@google.com>
 Shawn Pearce <spearce@spearce.org>           Shawn O. Pearce <spearce@spearce.org>
+Terry Parker <tparker@google.com>            tparker <tparker@google.com>
diff --git a/WORKSPACE b/WORKSPACE
index df99c95..9d723d2 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -11,8 +11,8 @@
 
 maven_jar(
     name = "jsch",
-    artifact = "com.jcraft:jsch:0.1.53",
-    sha1 = "658b682d5c817b27ae795637dfec047c63d29935",
+    artifact = "com.jcraft:jsch:0.1.54",
+    sha1 = "da3584329a263616e277e15462b387addd1b208d",
 )
 
 maven_jar(
@@ -29,26 +29,26 @@
 
 maven_jar(
     name = "httpclient",
-    artifact = "org.apache.httpcomponents:httpclient:4.5.2",
-    sha1 = "733db77aa8d9b2d68015189df76ab06304406e50",
+    artifact = "org.apache.httpcomponents:httpclient:4.5.5",
+    sha1 = "1603dfd56ebcd583ccdf337b6c3984ac55d89e58",
 )
 
 maven_jar(
     name = "httpcore",
-    artifact = "org.apache.httpcomponents:httpcore:4.4.6",
-    sha1 = "e3fd8ced1f52c7574af952e2e6da0df8df08eb82",
+    artifact = "org.apache.httpcomponents:httpcore:4.4.9",
+    sha1 = "a86ce739e5a7175b4b234c290a00a5fdb80957a0",
 )
 
 maven_jar(
     name = "commons-codec",
-    artifact = "commons-codec:commons-codec:1.4",
-    sha1 = "4216af16d38465bbab0f3dff8efa14204f7a399a",
+    artifact = "commons-codec:commons-codec:1.10",
+    sha1 = "4b95f4897fa13f2cd904aee711aeafc0c5295cd8",
 )
 
 maven_jar(
     name = "commons-logging",
-    artifact = "commons-logging:commons-logging:1.1.3",
-    sha1 = "f6f66e966c70a83ffbdb6f17a0919eaf7c8aca7f",
+    artifact = "commons-logging:commons-logging:1.2",
+    sha1 = "4bfc12adfe4842bf07b657f0369c4cb522955686",
 )
 
 maven_jar(
@@ -89,8 +89,8 @@
 
 maven_jar(
     name = "junit",
-    artifact = "junit:junit:4.11",
-    sha1 = "4e031bb61df09069aeb2bffb4019e7a5034a4ee0",
+    artifact = "junit:junit:4.12",
+    sha1 = "2973d150c0dc1fefe998f834810d68f278ea58ec",
 )
 
 maven_jar(
@@ -111,46 +111,46 @@
     sha1 = "3edcfe49d2c6053a70a2a47e4e1c2f94998a49cf",
 )
 
-JETTY_VER = "9.4.8.v20171121"
+JETTY_VER = "9.4.11.v20180605"
 
 maven_jar(
     name = "jetty-servlet",
     artifact = "org.eclipse.jetty:jetty-servlet:" + JETTY_VER,
-    sha1 = "bbbb9b5de08f468c7b9b3de6aea0b098d2c679b6",
-    src_sha1 = "6ef1e65a5af7ab2d79ba6043923affdaeaafb1e5",
+    sha1 = "66d31900fcfc70e3666f0b3335b6660635154f98",
+    src_sha1 = "930c50de49b9c258d5f0329426cbcac4d3143497",
 )
 
 maven_jar(
     name = "jetty-security",
     artifact = "org.eclipse.jetty:jetty-security:" + JETTY_VER,
-    sha1 = "e8350eec683b55494287f06740543e4be6f75425",
-    src_sha1 = "e3a879d8675fa10bc305e7a59006f1d09db04a68",
+    sha1 = "926def86d31ee07ca4b4658833dc6ee6918b8e86",
+    src_sha1 = "019bc7c2a366cbb201950f24dd64d9d9a49b6840",
 )
 
 maven_jar(
     name = "jetty-server",
     artifact = "org.eclipse.jetty:jetty-server:" + JETTY_VER,
-    sha1 = "34614bd9a29de57ef28ca31f1f2b49a412af196d",
-    src_sha1 = "fef49ac6b2bbc6d142dc0be34f68f0fb0792d52b",
+    sha1 = "58353c2f27515b007fc83ae22002feb34fc24714",
+    src_sha1 = "e7d832d74df616137755996b41bc28bb82b3bc42",
 )
 
 maven_jar(
     name = "jetty-http",
     artifact = "org.eclipse.jetty:jetty-http:" + JETTY_VER,
-    sha1 = "9879d6c4e37400bf43f0cd4b3c6e34a3ba409864",
-    src_sha1 = "5e746cd0ccb732eef0427c8c4b9dcb034e26c61b",
+    sha1 = "20c35f5336befe35b0bd5c4a63e07170fe7872d7",
+    src_sha1 = "5bc30d1f7e8c4456c22cc85999b8cafd3741bdff",
 )
 
 maven_jar(
     name = "jetty-io",
     artifact = "org.eclipse.jetty:jetty-io:" + JETTY_VER,
-    sha1 = "d3fe2dfa62f52ee91ff07cb359f63387e0e30b40",
-    src_sha1 = "41f25e1e1bba14ab0d3415488fa189f09c27a1cf",
+    sha1 = "d164de1dac18c4ca80a1b783d879c97449909c3b",
+    src_sha1 = "02c0caba292b1cb74cec1d36c6f91dc863c89b5a",
 )
 
 maven_jar(
     name = "jetty-util",
     artifact = "org.eclipse.jetty:jetty-util:" + JETTY_VER,
-    sha1 = "d6ec1a1613c7fa72aa6bf5d8c204750afbc3df3b",
-    src_sha1 = "a74ecb43f96b2e21852f6908604316d7348a16ad",
+    sha1 = "f0f25aa2f27d618a04bc7356fa247ae4a05245b3",
+    src_sha1 = "4e5c4c483cfd9804c2fc5d5751866243bbb9d740",
 )
diff --git a/lib/BUILD b/lib/BUILD
index 0e659e5..ebba0da 100644
--- a/lib/BUILD
+++ b/lib/BUILD
@@ -51,6 +51,7 @@
     name = "httpcore",
     visibility = [
         "//org.eclipse.jgit.http.apache:__pkg__",
+        "//org.eclipse.jgit.http.test:__pkg__",
         "//org.eclipse.jgit.lfs.server:__pkg__",
         "//org.eclipse.jgit.lfs.server.test:__pkg__",
         "//org.eclipse.jgit.pgm:__pkg__",
diff --git a/org.eclipse.jgit.ant.test/META-INF/MANIFEST.MF b/org.eclipse.jgit.ant.test/META-INF/MANIFEST.MF
index 268baee..1effd4d 100644
--- a/org.eclipse.jgit.ant.test/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.ant.test/META-INF/MANIFEST.MF
@@ -4,13 +4,13 @@
 Bundle-Name: %plugin_name
 Automatic-Module-Name: org.eclipse.jgit.ant.test
 Bundle-SymbolicName: org.eclipse.jgit.ant.test
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
 Bundle-ActivationPolicy: lazy
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
 Import-Package: org.apache.tools.ant,
- org.eclipse.jgit.ant.tasks;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.junit;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util;version="[5.0.4,5.1.0)",
+ org.eclipse.jgit.ant.tasks;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.junit;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util;version="[5.1.2,5.2.0)",
  org.hamcrest.core;version="[1.1.0,2.0.0)",
  org.junit;version="[4.12,5.0.0)"
diff --git a/org.eclipse.jgit.ant.test/pom.xml b/org.eclipse.jgit.ant.test/pom.xml
index 4bfbc9e..69fe1e8 100644
--- a/org.eclipse.jgit.ant.test/pom.xml
+++ b/org.eclipse.jgit.ant.test/pom.xml
@@ -50,7 +50,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>org.eclipse.jgit-parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <artifactId>org.eclipse.jgit.ant.test</artifactId>
diff --git a/org.eclipse.jgit.ant/META-INF/MANIFEST.MF b/org.eclipse.jgit.ant/META-INF/MANIFEST.MF
index 6df3091..06af7e2 100644
--- a/org.eclipse.jgit.ant/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.ant/META-INF/MANIFEST.MF
@@ -3,11 +3,11 @@
 Bundle-Name: %Bundle-Name
 Automatic-Module-Name: org.eclipse.jgit.ant
 Bundle-SymbolicName: org.eclipse.jgit.ant
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
 Import-Package: org.apache.tools.ant,
-  org.eclipse.jgit.storage.file;version="[5.0.4,5.1.0)"
+  org.eclipse.jgit.storage.file;version="[5.1.2,5.2.0)"
 Bundle-Localization: plugin
 Bundle-Vendor: %Provider-Name
-Export-Package: org.eclipse.jgit.ant.tasks;version="5.0.4";
+Export-Package: org.eclipse.jgit.ant.tasks;version="5.1.2";
  uses:="org.apache.tools.ant.types,org.apache.tools.ant"
diff --git a/org.eclipse.jgit.ant/pom.xml b/org.eclipse.jgit.ant/pom.xml
index a288360..af8a3ba 100644
--- a/org.eclipse.jgit.ant/pom.xml
+++ b/org.eclipse.jgit.ant/pom.xml
@@ -48,7 +48,7 @@
 	<parent>
 		<groupId>org.eclipse.jgit</groupId>
 		<artifactId>org.eclipse.jgit-parent</artifactId>
-		<version>5.0.4-SNAPSHOT</version>
+		<version>5.1.2-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>org.eclipse.jgit.ant</artifactId>
diff --git a/org.eclipse.jgit.archive/META-INF/MANIFEST.MF b/org.eclipse.jgit.archive/META-INF/MANIFEST.MF
index 3285ee4..59de3ea 100644
--- a/org.eclipse.jgit.archive/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.archive/META-INF/MANIFEST.MF
@@ -3,7 +3,7 @@
 Bundle-Name: %plugin_name
 Automatic-Module-Name: org.eclipse.jgit.archive
 Bundle-SymbolicName: org.eclipse.jgit.archive
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
 Bundle-Vendor: %provider_name
 Bundle-Localization: plugin
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
@@ -13,15 +13,15 @@
  org.apache.commons.compress.compressors.bzip2;version="[1.4,2.0)",
  org.apache.commons.compress.compressors.gzip;version="[1.4,2.0)",
  org.apache.commons.compress.compressors.xz;version="[1.4,2.0)",
- org.eclipse.jgit.api;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.nls;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.revwalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util;version="[5.0.4,5.1.0)",
+ org.eclipse.jgit.api;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.nls;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.revwalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util;version="[5.1.2,5.2.0)",
  org.osgi.framework;version="[1.3.0,2.0.0)"
 Bundle-ActivationPolicy: lazy
 Bundle-Activator: org.eclipse.jgit.archive.FormatActivator
-Export-Package: org.eclipse.jgit.archive;version="5.0.4";
+Export-Package: org.eclipse.jgit.archive;version="5.1.2";
   uses:="org.eclipse.jgit.lib,
    org.eclipse.jgit.api,
    org.apache.commons.compress.archivers,
diff --git a/org.eclipse.jgit.archive/META-INF/SOURCE-MANIFEST.MF b/org.eclipse.jgit.archive/META-INF/SOURCE-MANIFEST.MF
index f85551e..664e272 100644
--- a/org.eclipse.jgit.archive/META-INF/SOURCE-MANIFEST.MF
+++ b/org.eclipse.jgit.archive/META-INF/SOURCE-MANIFEST.MF
@@ -3,5 +3,5 @@
 Bundle-Name: org.eclipse.jgit.archive - Sources
 Bundle-SymbolicName: org.eclipse.jgit.archive.source
 Bundle-Vendor: Eclipse.org - JGit
-Bundle-Version: 5.0.4.qualifier
-Eclipse-SourceBundle: org.eclipse.jgit.archive;version="5.0.4.qualifier";roots="."
+Bundle-Version: 5.1.2.qualifier
+Eclipse-SourceBundle: org.eclipse.jgit.archive;version="5.1.2.qualifier";roots="."
diff --git a/org.eclipse.jgit.archive/pom.xml b/org.eclipse.jgit.archive/pom.xml
index 4bfa176..a7594ca 100644
--- a/org.eclipse.jgit.archive/pom.xml
+++ b/org.eclipse.jgit.archive/pom.xml
@@ -50,7 +50,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>org.eclipse.jgit-parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <artifactId>org.eclipse.jgit.archive</artifactId>
diff --git a/org.eclipse.jgit.http.apache/META-INF/MANIFEST.MF b/org.eclipse.jgit.http.apache/META-INF/MANIFEST.MF
index 69fb47c..dd198c2 100644
--- a/org.eclipse.jgit.http.apache/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.http.apache/META-INF/MANIFEST.MF
@@ -3,7 +3,7 @@
 Bundle-Name: %Bundle-Name
 Automatic-Module-Name: org.eclipse.jgit.http.apache
 Bundle-SymbolicName: org.eclipse.jgit.http.apache
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
 Bundle-Localization: plugin
 Bundle-Vendor: %Provider-Name
@@ -23,10 +23,10 @@
  org.apache.http.impl.client;version="[4.3.0,5.0.0)",
  org.apache.http.impl.conn;version="[4.3.0,5.0.0)",
  org.apache.http.params;version="[4.3.0,5.0.0)",
- org.eclipse.jgit.nls;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport.http;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util;version="[5.0.4,5.1.0)"
-Export-Package: org.eclipse.jgit.transport.http.apache;version="5.0.4";
+ org.eclipse.jgit.nls;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport.http;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util;version="[5.1.2,5.2.0)"
+Export-Package: org.eclipse.jgit.transport.http.apache;version="5.1.2";
   uses:="org.apache.http.client,
    org.eclipse.jgit.transport.http,
    org.apache.http.entity,
diff --git a/org.eclipse.jgit.http.apache/pom.xml b/org.eclipse.jgit.http.apache/pom.xml
index bc71faa..254e77f 100644
--- a/org.eclipse.jgit.http.apache/pom.xml
+++ b/org.eclipse.jgit.http.apache/pom.xml
@@ -48,7 +48,7 @@
 	<parent>
 		<groupId>org.eclipse.jgit</groupId>
 		<artifactId>org.eclipse.jgit-parent</artifactId>
-		<version>5.0.4-SNAPSHOT</version>
+		<version>5.1.2-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>org.eclipse.jgit.http.apache</artifactId>
diff --git a/org.eclipse.jgit.http.apache/src/org/eclipse/jgit/transport/http/apache/HttpClientConnection.java b/org.eclipse.jgit.http.apache/src/org/eclipse/jgit/transport/http/apache/HttpClientConnection.java
index 7f1fecb..77c5dc0 100644
--- a/org.eclipse.jgit.http.apache/src/org/eclipse/jgit/transport/http/apache/HttpClientConnection.java
+++ b/org.eclipse.jgit.http.apache/src/org/eclipse/jgit/transport/http/apache/HttpClientConnection.java
@@ -272,10 +272,14 @@
 	public Map<String, List<String>> getHeaderFields() {
 		Map<String, List<String>> ret = new HashMap<>();
 		for (Header hdr : resp.getAllHeaders()) {
-			List<String> list = new LinkedList<>();
-			for (HeaderElement hdrElem : hdr.getElements())
+			List<String> list = ret.get(hdr.getName());
+			if (list == null) {
+				list = new LinkedList<>();
+				ret.put(hdr.getName(), list);
+			}
+			for (HeaderElement hdrElem : hdr.getElements()) {
 				list.add(hdrElem.toString());
-			ret.put(hdr.getName(), list);
+			}
 		}
 		return ret;
 	}
diff --git a/org.eclipse.jgit.http.server/META-INF/MANIFEST.MF b/org.eclipse.jgit.http.server/META-INF/MANIFEST.MF
index c97b927..34ab913 100644
--- a/org.eclipse.jgit.http.server/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.http.server/META-INF/MANIFEST.MF
@@ -3,13 +3,13 @@
 Bundle-Name: %plugin_name
 Automatic-Module-Name: org.eclipse.jgit.http.server
 Bundle-SymbolicName: org.eclipse.jgit.http.server
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
 Bundle-Localization: plugin
 Bundle-Vendor: %provider_name
-Export-Package: org.eclipse.jgit.http.server;version="5.0.4",
- org.eclipse.jgit.http.server.glue;version="5.0.4";
+Export-Package: org.eclipse.jgit.http.server;version="5.1.2",
+ org.eclipse.jgit.http.server.glue;version="5.1.2";
   uses:="javax.servlet,javax.servlet.http",
- org.eclipse.jgit.http.server.resolver;version="5.0.4";
+ org.eclipse.jgit.http.server.resolver;version="5.1.2";
   uses:="org.eclipse.jgit.transport.resolver,
    org.eclipse.jgit.lib,
    org.eclipse.jgit.transport,
@@ -18,12 +18,12 @@
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
 Import-Package: javax.servlet;version="[2.5.0,3.2.0)",
  javax.servlet.http;version="[2.5.0,3.2.0)",
- org.eclipse.jgit.errors;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.dfs;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.file;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.nls;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.revwalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport.resolver;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util;version="[5.0.4,5.1.0)"
+ org.eclipse.jgit.errors;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.dfs;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.file;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.nls;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.revwalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport.resolver;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util;version="[5.1.2,5.2.0)"
diff --git a/org.eclipse.jgit.http.server/pom.xml b/org.eclipse.jgit.http.server/pom.xml
index 6f70081..6de6c6a 100644
--- a/org.eclipse.jgit.http.server/pom.xml
+++ b/org.eclipse.jgit.http.server/pom.xml
@@ -52,7 +52,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>org.eclipse.jgit-parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <artifactId>org.eclipse.jgit.http.server</artifactId>
diff --git a/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/InfoRefsServlet.java b/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/InfoRefsServlet.java
index 0f4633b..1a9d192 100644
--- a/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/InfoRefsServlet.java
+++ b/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/InfoRefsServlet.java
@@ -43,6 +43,7 @@
 
 package org.eclipse.jgit.http.server;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.http.server.ServletUtils.getRepository;
 
 import java.io.IOException;
@@ -73,7 +74,7 @@
 		final Repository db = getRepository(req);
 		try (OutputStreamWriter out = new OutputStreamWriter(
 				new SmartOutputStream(req, rsp, true),
-				Constants.CHARSET)) {
+				UTF_8)) {
 			final RefAdvertiser adv = new RefAdvertiser() {
 				@Override
 				protected void writeOne(CharSequence line)
diff --git a/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/SmartServiceInfoRefs.java b/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/SmartServiceInfoRefs.java
index 195dff9..75611ee 100644
--- a/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/SmartServiceInfoRefs.java
+++ b/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/SmartServiceInfoRefs.java
@@ -77,7 +77,7 @@
 
 	SmartServiceInfoRefs(String service, List<Filter> filters) {
 		this.svc = service;
-		this.filters = filters.toArray(new Filter[filters.size()]);
+		this.filters = filters.toArray(new Filter[0]);
 	}
 
 	/** {@inheritDoc} */
diff --git a/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/glue/ServletBinderImpl.java b/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/glue/ServletBinderImpl.java
index 18650eb..f167497 100644
--- a/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/glue/ServletBinderImpl.java
+++ b/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/glue/ServletBinderImpl.java
@@ -98,7 +98,7 @@
 	 * @return the configured filters; zero-length array if none.
 	 */
 	protected Filter[] getFilters() {
-		return filters.toArray(new Filter[filters.size()]);
+		return filters.toArray(new Filter[0]);
 	}
 
 	/** @return the pipeline that matches and executes this chain. */
diff --git a/org.eclipse.jgit.http.test/BUILD b/org.eclipse.jgit.http.test/BUILD
index 85a2242..dcffa06 100644
--- a/org.eclipse.jgit.http.test/BUILD
+++ b/org.eclipse.jgit.http.test/BUILD
@@ -10,6 +10,7 @@
     deps = [
         ":helpers",
         "//lib:commons-logging",
+        "//lib:httpcore",
         "//lib:jetty-http",
         "//lib:jetty-io",
         "//lib:jetty-security",
diff --git a/org.eclipse.jgit.http.test/META-INF/MANIFEST.MF b/org.eclipse.jgit.http.test/META-INF/MANIFEST.MF
index 8bb282e..6dfab66 100644
--- a/org.eclipse.jgit.http.test/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.http.test/META-INF/MANIFEST.MF
@@ -3,7 +3,7 @@
 Bundle-Name: %plugin_name
 Automatic-Module-Name: org.eclipse.jgit.http.test
 Bundle-SymbolicName: org.eclipse.jgit.http.test
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
 Bundle-Vendor: %provider_name
 Bundle-Localization: plugin
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
@@ -11,6 +11,9 @@
  javax.servlet.http;version="[2.5.0,3.2.0)",
  org.apache.commons.codec;version="[1.6.0,2.0.0)",
  org.apache.commons.codec.binary;version="[1.6.0,2.0.0)",
+ org.apache.http;version="[4.3.0,5.0.0)",
+ org.apache.http.client;version="[4.3.0,5.0.0)",
+ org.apache.http.message;version="[4.3.0,5.0.0)",
  org.eclipse.jetty.continuation;version="[9.4.5,10.0.0)",
  org.eclipse.jetty.http;version="[9.4.5,10.0.0)",
  org.eclipse.jetty.io;version="[9.4.5,10.0.0)",
@@ -25,25 +28,25 @@
  org.eclipse.jetty.util.log;version="[9.4.5,10.0.0)",
  org.eclipse.jetty.util.security;version="[9.4.5,10.0.0)",
  org.eclipse.jetty.util.thread;version="[9.4.5,10.0.0)",
- org.eclipse.jgit.errors;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.http.server;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.http.server.glue;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.http.server.resolver;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.dfs;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.file;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.reftable;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.junit;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.junit.http;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.nls;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.revwalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.storage.file;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport.http;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport.http.apache;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport.resolver;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util;version="[5.0.4,5.1.0)",
+ org.eclipse.jgit.errors;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.http.server;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.http.server.glue;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.http.server.resolver;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.dfs;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.file;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.reftable;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.junit;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.junit.http;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.nls;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.revwalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.storage.file;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport.http;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport.http.apache;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport.resolver;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util;version="[5.1.2,5.2.0)",
  org.hamcrest;version="[1.1.0,2.0.0)",
  org.hamcrest.core;version="[1.1.0,2.0.0)",
  org.junit;version="[4.12,5.0.0)",
diff --git a/org.eclipse.jgit.http.test/pom.xml b/org.eclipse.jgit.http.test/pom.xml
index 7b83240..2d77659 100644
--- a/org.eclipse.jgit.http.test/pom.xml
+++ b/org.eclipse.jgit.http.test/pom.xml
@@ -51,7 +51,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>org.eclipse.jgit-parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <artifactId>org.eclipse.jgit.http.test</artifactId>
diff --git a/org.eclipse.jgit.http.test/tst/org/eclipse/jgit/http/test/HttpClientTests.java b/org.eclipse.jgit.http.test/tst/org/eclipse/jgit/http/test/HttpClientTests.java
index ef059bf..53626b1 100644
--- a/org.eclipse.jgit.http.test/tst/org/eclipse/jgit/http/test/HttpClientTests.java
+++ b/org.eclipse.jgit.http.test/tst/org/eclipse/jgit/http/test/HttpClientTests.java
@@ -175,7 +175,9 @@
 			} catch (NoRemoteRepositoryException err) {
 				String exp = uri + ": " + uri
 						+ "/info/refs?service=git-upload-pack not found";
-				assertEquals(exp, err.getMessage());
+				assertNotNull(err.getMessage());
+				assertTrue("Unexpected error message",
+						err.getMessage().startsWith(exp));
 			}
 		}
 	}
@@ -191,7 +193,9 @@
 			} catch (NoRemoteRepositoryException err) {
 				String exp = uri + ": " + uri
 						+ "/info/refs?service=git-upload-pack not found";
-				assertEquals(exp, err.getMessage());
+				assertNotNull(err.getMessage());
+				assertTrue("Unexpected error message",
+						err.getMessage().startsWith(exp));
 			}
 		}
 	}
@@ -363,7 +367,7 @@
 		c.setRequestMethod("GET");
 		c.setRequestProperty("Git-Protocol", "version=2");
 		c.connect();
-		assertThat(c.getResponseCode(), is(200));
+		assertEquals(200, c.getResponseCode());
 
 		PacketLineIn pckIn = new PacketLineIn(c.getInputStream());
 
@@ -384,7 +388,7 @@
 		c.setRequestMethod("GET");
 		c.setRequestProperty("Git-Protocol", "version=2");
 		c.connect();
-		assertThat(c.getResponseCode(), is(200));
+		assertEquals(200, c.getResponseCode());
 
 		PacketLineIn pckIn = new PacketLineIn(c.getInputStream());
 		assertThat(pckIn.readString(), is("version 2"));
@@ -415,12 +419,12 @@
 		// properly. Tests for other commands go in
 		// UploadPackTest.java.
 
-		OutputStream os = c.getOutputStream();
-		PacketLineOut pckOut = new PacketLineOut(os);
-		pckOut.writeString("command=ls-refs");
-		pckOut.writeDelim();
-		pckOut.end();
-		os.close();
+		try (OutputStream os = c.getOutputStream()) {
+			PacketLineOut pckOut = new PacketLineOut(os);
+			pckOut.writeString("command=ls-refs");
+			pckOut.writeDelim();
+			pckOut.end();
+		}
 
 		PacketLineIn pckIn = new PacketLineIn(c.getInputStream());
 
@@ -430,6 +434,6 @@
 			assertTrue(s.matches("[0-9a-f]{40} [A-Za-z/]*"));
 		}
 
-		assertThat(c.getResponseCode(), is(200));
+		assertEquals(200, c.getResponseCode());
 	}
 }
diff --git a/org.eclipse.jgit.http.test/tst/org/eclipse/jgit/http/test/SmartClientSmartServerTest.java b/org.eclipse.jgit.http.test/tst/org/eclipse/jgit/http/test/SmartClientSmartServerTest.java
index 42db0fe..51aa5f2 100644
--- a/org.eclipse.jgit.http.test/tst/org/eclipse/jgit/http/test/SmartClientSmartServerTest.java
+++ b/org.eclipse.jgit.http.test/tst/org/eclipse/jgit/http/test/SmartClientSmartServerTest.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.http.test;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.util.HttpSupport.HDR_CONTENT_ENCODING;
 import static org.eclipse.jgit.util.HttpSupport.HDR_CONTENT_LENGTH;
 import static org.eclipse.jgit.util.HttpSupport.HDR_CONTENT_TYPE;
@@ -1081,7 +1081,7 @@
 	public void testInvalidWant() throws Exception {
 		@SuppressWarnings("resource")
 		ObjectId id = new ObjectInserter.Formatter().idFor(Constants.OBJ_BLOB,
-				"testInvalidWant".getBytes(CHARSET));
+				"testInvalidWant".getBytes(UTF_8));
 
 		Repository dst = createBareRepository();
 		try (Transport t = Transport.open(dst, remoteURI);
diff --git a/org.eclipse.jgit.http.test/tst/org/eclipse/jgit/transport/http/apache/HttpClientConnectionTest.java b/org.eclipse.jgit.http.test/tst/org/eclipse/jgit/transport/http/apache/HttpClientConnectionTest.java
new file mode 100644
index 0000000..72c4921
--- /dev/null
+++ b/org.eclipse.jgit.http.test/tst/org/eclipse/jgit/transport/http/apache/HttpClientConnectionTest.java
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2018 Gabriel Couto <gmcouto@gmail.com>
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.eclipse.jgit.transport.http.apache;
+
+import org.apache.http.HttpEntity;
+import org.apache.http.HttpResponse;
+import org.apache.http.ProtocolVersion;
+import org.apache.http.StatusLine;
+import org.apache.http.message.AbstractHttpMessage;
+import org.junit.Test;
+
+import java.net.MalformedURLException;
+import java.util.List;
+import java.util.Locale;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+public class HttpClientConnectionTest {
+	@Test
+	public void testGetHeaderFieldsAllowMultipleValues()
+			throws MalformedURLException {
+		HttpResponse responseMock = new HttpResponseMock();
+		String headerField = "WWW-Authenticate";
+		responseMock.addHeader(headerField, "Basic");
+		responseMock.addHeader(headerField, "Digest");
+		responseMock.addHeader(headerField, "NTLM");
+		HttpClientConnection connection = new HttpClientConnection(
+				"http://0.0.0.0/");
+		connection.resp = responseMock;
+		List<String> headerValues = connection.getHeaderFields()
+				.get(headerField);
+		assertEquals(3, headerValues.size());
+		assertTrue(headerValues.contains("Basic"));
+		assertTrue(headerValues.contains("Digest"));
+		assertTrue(headerValues.contains("NTLM"));
+	}
+
+	private class HttpResponseMock extends AbstractHttpMessage
+			implements HttpResponse {
+		@Override
+		public StatusLine getStatusLine() {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public void setStatusLine(StatusLine statusLine) {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public void setStatusLine(ProtocolVersion protocolVersion, int i) {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public void setStatusLine(ProtocolVersion protocolVersion, int i,
+				String s) {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public void setStatusCode(int i) throws IllegalStateException {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public void setReasonPhrase(String s) throws IllegalStateException {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public HttpEntity getEntity() {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public void setEntity(HttpEntity httpEntity) {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public Locale getLocale() {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public void setLocale(Locale locale) {
+			throw new UnsupportedOperationException();
+		}
+
+		@Override
+		public ProtocolVersion getProtocolVersion() {
+			throw new UnsupportedOperationException();
+		}
+	}
+}
diff --git a/org.eclipse.jgit.junit.http/META-INF/MANIFEST.MF b/org.eclipse.jgit.junit.http/META-INF/MANIFEST.MF
index a68d152..2e13960 100644
--- a/org.eclipse.jgit.junit.http/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.junit.http/META-INF/MANIFEST.MF
@@ -3,7 +3,7 @@
 Bundle-Name: %plugin_name
 Automatic-Module-Name: org.eclipse.jgit.junit.http
 Bundle-SymbolicName: org.eclipse.jgit.junit.http
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
 Bundle-Localization: plugin
 Bundle-Vendor: %provider_name
 Bundle-ActivationPolicy: lazy
@@ -22,16 +22,16 @@
  org.eclipse.jetty.util.log;version="[9.4.5,10.0.0)",
  org.eclipse.jetty.util.security;version="[9.4.5,10.0.0)",
  org.eclipse.jetty.util.ssl;version="[9.4.5,10.0.0)",
- org.eclipse.jgit.errors;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.http.server;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.file;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.junit;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.revwalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport.resolver;version="[5.0.4,5.1.0)",
+ org.eclipse.jgit.errors;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.http.server;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.file;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.junit;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.revwalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport.resolver;version="[5.1.2,5.2.0)",
  org.junit;version="[4.12,5.0.0)"
-Export-Package: org.eclipse.jgit.junit.http;version="5.0.4";
+Export-Package: org.eclipse.jgit.junit.http;version="5.1.2";
   uses:="org.eclipse.jgit.transport,
    org.eclipse.jgit.junit,
    javax.servlet.http,
diff --git a/org.eclipse.jgit.junit.http/pom.xml b/org.eclipse.jgit.junit.http/pom.xml
index eb7d02f..72a0c19 100644
--- a/org.eclipse.jgit.junit.http/pom.xml
+++ b/org.eclipse.jgit.junit.http/pom.xml
@@ -50,7 +50,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>org.eclipse.jgit-parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <artifactId>org.eclipse.jgit.junit.http</artifactId>
diff --git a/org.eclipse.jgit.junit.http/src/org/eclipse/jgit/junit/http/AppServer.java b/org.eclipse.jgit.junit.http/src/org/eclipse/jgit/junit/http/AppServer.java
index 9309fe7..9aef086 100644
--- a/org.eclipse.jgit.junit.http/src/org/eclipse/jgit/junit/http/AppServer.java
+++ b/org.eclipse.jgit.junit.http/src/org/eclipse/jgit/junit/http/AppServer.java
@@ -349,7 +349,7 @@
 		sec.setAuthenticator(authType);
 		sec.setLoginService(users);
 		sec.setConstraintMappings(
-				mappings.toArray(new ConstraintMapping[mappings.size()]));
+				mappings.toArray(new ConstraintMapping[0]));
 		sec.setHandler(ctx);
 
 		contexts.removeHandler(ctx);
diff --git a/org.eclipse.jgit.junit/META-INF/MANIFEST.MF b/org.eclipse.jgit.junit/META-INF/MANIFEST.MF
index 749f8fe..adb1838 100644
--- a/org.eclipse.jgit.junit/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.junit/META-INF/MANIFEST.MF
@@ -3,31 +3,31 @@
 Bundle-Name: %plugin_name
 Automatic-Module-Name: org.eclipse.jgit.junit
 Bundle-SymbolicName: org.eclipse.jgit.junit
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
 Bundle-Localization: plugin
 Bundle-Vendor: %provider_name
 Bundle-ActivationPolicy: lazy
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
-Import-Package: org.eclipse.jgit.api;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.api.errors;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.dircache;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.errors;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.file;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.pack;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.merge;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.revwalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.storage.file;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.treewalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.treewalk.filter;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util.io;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util.time;version="[5.0.4,5.1.0)",
+Import-Package: org.eclipse.jgit.api;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.api.errors;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.dircache;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.errors;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.file;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.pack;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.merge;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.revwalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.storage.file;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.treewalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.treewalk.filter;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util.io;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util.time;version="[5.1.2,5.2.0)",
  org.junit;version="[4.12,5.0.0)",
  org.junit.rules;version="[4.12,5.0.0)",
  org.junit.runner;version="[4.12,5.0.0)",
  org.junit.runners.model;version="[4.12,5.0.0)"
-Export-Package: org.eclipse.jgit.junit;version="5.0.4";
+Export-Package: org.eclipse.jgit.junit;version="5.1.2";
   uses:="org.eclipse.jgit.dircache,
    org.eclipse.jgit.lib,
    org.eclipse.jgit.revwalk,
@@ -36,4 +36,4 @@
    org.eclipse.jgit.util,
    org.eclipse.jgit.storage.file,
    org.eclipse.jgit.api",
- org.eclipse.jgit.junit.time;version="5.0.4"
+ org.eclipse.jgit.junit.time;version="5.1.2"
diff --git a/org.eclipse.jgit.junit/pom.xml b/org.eclipse.jgit.junit/pom.xml
index 30ce0b3..ce56e03 100644
--- a/org.eclipse.jgit.junit/pom.xml
+++ b/org.eclipse.jgit.junit/pom.xml
@@ -52,7 +52,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>org.eclipse.jgit-parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <artifactId>org.eclipse.jgit.junit</artifactId>
diff --git a/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/JGitTestUtil.java b/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/JGitTestUtil.java
index a102da1..b59b714 100644
--- a/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/JGitTestUtil.java
+++ b/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/JGitTestUtil.java
@@ -45,7 +45,7 @@
 
 package org.eclipse.jgit.junit;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.File;
 import java.io.FileNotFoundException;
@@ -246,7 +246,7 @@
 			throws IOException {
 		FileUtils.mkdirs(f.getParentFile(), true);
 		try (Writer w = new OutputStreamWriter(new FileOutputStream(f),
-				CHARSET)) {
+				UTF_8)) {
 			w.write(body);
 		}
 	}
@@ -263,7 +263,7 @@
 	 */
 	public static String read(File file) throws IOException {
 		final byte[] body = IO.readFully(file);
-		return new String(body, 0, body.length, CHARSET);
+		return new String(body, 0, body.length, UTF_8);
 	}
 
 	/**
diff --git a/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/LocalDiskRepositoryTestCase.java b/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/LocalDiskRepositoryTestCase.java
index 6cdd0eb..12b2169 100644
--- a/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/LocalDiskRepositoryTestCase.java
+++ b/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/LocalDiskRepositoryTestCase.java
@@ -45,7 +45,7 @@
 
 package org.eclipse.jgit.junit;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.fail;
 
@@ -352,7 +352,7 @@
 			if (0 != (includedOptions & CONTENT)) {
 				sb.append(", content:"
 						+ new String(repo.open(entry.getObjectId(),
-						Constants.OBJ_BLOB).getCachedBytes(), CHARSET));
+								Constants.OBJ_BLOB).getCachedBytes(), UTF_8));
 			}
 			if (0 != (includedOptions & ASSUME_UNCHANGED))
 				sb.append(", assume-unchanged:"
diff --git a/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/RepositoryTestCase.java b/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/RepositoryTestCase.java
index e983e5d..95fe18b 100644
--- a/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/RepositoryTestCase.java
+++ b/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/RepositoryTestCase.java
@@ -46,7 +46,7 @@
 
 package org.eclipse.jgit.junit;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 
 import java.io.File;
@@ -192,7 +192,7 @@
 	protected static void checkFile(File f, String checkData)
 			throws IOException {
 		try (Reader r = new InputStreamReader(new FileInputStream(f),
-				CHARSET)) {
+				UTF_8)) {
 			if (checkData.length() > 0) {
 				char[] data = new char[checkData.length()];
 				assertEquals(data.length, r.read(data));
diff --git a/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/TestRepository.java b/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/TestRepository.java
index d23c0d3..c9fa2f5 100644
--- a/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/TestRepository.java
+++ b/org.eclipse.jgit.junit/src/org/eclipse/jgit/junit/TestRepository.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.junit;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.fail;
 
@@ -268,7 +268,7 @@
 	 * @throws Exception
 	 */
 	public RevBlob blob(String content) throws Exception {
-		return blob(content.getBytes(CHARSET));
+		return blob(content.getBytes(UTF_8));
 	}
 
 	/**
@@ -276,7 +276,7 @@
 	 *
 	 * @param content
 	 *            binary file content.
-	 * @return reference to the blob.
+	 * @return the new, fully parsed blob.
 	 * @throws Exception
 	 */
 	public RevBlob blob(byte[] content) throws Exception {
@@ -285,7 +285,7 @@
 			id = ins.insert(Constants.OBJ_BLOB, content);
 			ins.flush();
 		}
-		return pool.lookupBlob(id);
+		return (RevBlob) pool.parseAny(id);
 	}
 
 	/**
@@ -312,21 +312,22 @@
 	 * @param entries
 	 *            the files to include in the tree. The collection does not need
 	 *            to be sorted properly and may be empty.
-	 * @return reference to the tree specified by the entry list.
+	 * @return the new, fully parsed tree specified by the entry list.
 	 * @throws Exception
 	 */
 	public RevTree tree(DirCacheEntry... entries) throws Exception {
 		final DirCache dc = DirCache.newInCore();
 		final DirCacheBuilder b = dc.builder();
-		for (DirCacheEntry e : entries)
+		for (DirCacheEntry e : entries) {
 			b.add(e);
+		}
 		b.finish();
 		ObjectId root;
 		try (ObjectInserter ins = inserter) {
 			root = dc.writeTree(ins);
 			ins.flush();
 		}
-		return pool.lookupTree(root);
+		return pool.parseTree(root);
 	}
 
 	/**
@@ -422,7 +423,7 @@
 	 *            the root tree for the commit.
 	 * @param parents
 	 *            zero or more parents of the commit.
-	 * @return the new commit.
+	 * @return the new, fully parsed commit.
 	 * @throws Exception
 	 */
 	public RevCommit commit(final int secDelta, final RevTree tree,
@@ -442,7 +443,7 @@
 			id = ins.insert(c);
 			ins.flush();
 		}
-		return pool.lookupCommit(id);
+		return pool.parseCommit(id);
 	}
 
 	/**
@@ -467,7 +468,7 @@
 	 *            with {@code refs/tags/}.
 	 * @param dst
 	 *            object the tag should be pointed at.
-	 * @return the annotated tag object.
+	 * @return the new, fully parsed annotated tag object.
 	 * @throws Exception
 	 */
 	public RevTag tag(String name, RevObject dst) throws Exception {
@@ -481,7 +482,7 @@
 			id = ins.insert(t);
 			ins.flush();
 		}
-		return (RevTag) pool.lookupAny(id, Constants.OBJ_TAG);
+		return pool.parseTag(id);
 	}
 
 	/**
@@ -705,8 +706,8 @@
 	 *
 	 * @param id
 	 *            commit-ish to cherry-pick.
-	 * @return newly created commit, or null if no work was done due to the
-	 *         resulting tree being identical.
+	 * @return the new, fully parsed commit, or null if no work was done due to
+	 *         the resulting tree being identical.
 	 * @throws Exception
 	 */
 	public RevCommit cherryPick(AnyObjectId id) throws Exception {
@@ -757,7 +758,7 @@
 	public void updateServerInfo() throws Exception {
 		if (db instanceof FileRepository) {
 			final FileRepository fr = (FileRepository) db;
-			RefWriter rw = new RefWriter(fr.getAllRefs().values()) {
+			RefWriter rw = new RefWriter(fr.getRefDatabase().getRefs()) {
 				@Override
 				protected void writeFile(String name, byte[] bin)
 						throws IOException {
@@ -852,7 +853,7 @@
 				for (RevObject o : tips)
 					ow.markStart(ow.parseAny(o));
 			} else {
-				for (Ref r : db.getAllRefs().values())
+				for (Ref r : db.getRefDatabase().getRefs())
 					ow.markStart(ow.parseAny(r.getObjectId()));
 			}
 
@@ -905,7 +906,7 @@
 			final File pack, idx;
 			try (PackWriter pw = new PackWriter(db)) {
 				Set<ObjectId> all = new HashSet<>();
-				for (Ref r : db.getAllRefs().values())
+				for (Ref r : db.getRefDatabase().getRefs())
 					all.add(r.getObjectId());
 				pw.preparePack(m, all, PackWriter.NONE);
 
@@ -1197,7 +1198,7 @@
 					commitId = ins.insert(c);
 					ins.flush();
 				}
-				self = pool.lookupCommit(commitId);
+				self = pool.parseCommit(commitId);
 
 				if (branch != null)
 					branch.update(self);
diff --git a/org.eclipse.jgit.lfs.server.test/META-INF/MANIFEST.MF b/org.eclipse.jgit.lfs.server.test/META-INF/MANIFEST.MF
index c805f75..89f0f0f 100644
--- a/org.eclipse.jgit.lfs.server.test/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.lfs.server.test/META-INF/MANIFEST.MF
@@ -3,7 +3,7 @@
 Bundle-Name: %plugin_name
 Automatic-Module-Name: org.eclipse.jgit.lfs.server.test
 Bundle-SymbolicName: org.eclipse.jgit.lfs.server.test
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
 Bundle-Vendor: %provider_name
 Bundle-Localization: plugin
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
@@ -28,24 +28,24 @@
  org.eclipse.jetty.util.log;version="[9.4.5,10.0.0)",
  org.eclipse.jetty.util.security;version="[9.4.5,10.0.0)",
  org.eclipse.jetty.util.thread;version="[9.4.5,10.0.0)",
- org.eclipse.jgit.api;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.api.errors;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.file;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.junit;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.junit.http;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs.errors;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs.server;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs.server.fs;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs.test;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.revwalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.storage.file;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.treewalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.treewalk.filter;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util;version="[5.0.4,5.1.0)",
+ org.eclipse.jgit.api;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.api.errors;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.file;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.junit;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.junit.http;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs.errors;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs.server;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs.server.fs;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs.test;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.revwalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.storage.file;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.treewalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.treewalk.filter;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util;version="[5.1.2,5.2.0)",
  org.hamcrest.core;version="[1.1.0,2.0.0)",
  org.junit;version="[4.12,5.0.0)",
  org.junit.rules;version="[4.12,5.0.0)",
diff --git a/org.eclipse.jgit.lfs.server.test/pom.xml b/org.eclipse.jgit.lfs.server.test/pom.xml
index dee3199..715867a 100644
--- a/org.eclipse.jgit.lfs.server.test/pom.xml
+++ b/org.eclipse.jgit.lfs.server.test/pom.xml
@@ -50,7 +50,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>org.eclipse.jgit-parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <artifactId>org.eclipse.jgit.lfs.server.test</artifactId>
@@ -111,7 +111,6 @@
     <dependency>
       <groupId>org.apache.httpcomponents</groupId>
       <artifactId>httpclient</artifactId>
-      <version>4.3.6</version>
     </dependency>
   </dependencies>
 
diff --git a/org.eclipse.jgit.lfs.server.test/tst/org/eclipse/jgit/lfs/server/fs/LfsServerTest.java b/org.eclipse.jgit.lfs.server.test/tst/org/eclipse/jgit/lfs/server/fs/LfsServerTest.java
index 50a06f9..10823b8 100644
--- a/org.eclipse.jgit.lfs.server.test/tst/org/eclipse/jgit/lfs/server/fs/LfsServerTest.java
+++ b/org.eclipse.jgit.lfs.server.test/tst/org/eclipse/jgit/lfs/server/fs/LfsServerTest.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.lfs.server.fs;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 
 import java.io.BufferedInputStream;
@@ -211,11 +211,11 @@
 				if (buf.hasArray()) {
 					error = new String(buf.array(),
 							buf.arrayOffset() + buf.position(), buf.remaining(),
-							CHARSET);
+							UTF_8);
 				} else {
 					final byte[] b = new byte[buf.remaining()];
 					buf.duplicate().get(b);
-					error = new String(b, CHARSET);
+					error = new String(b, UTF_8);
 				}
 			} catch (IOException e) {
 				error = statusLine.getReasonPhrase();
diff --git a/org.eclipse.jgit.lfs.server/.settings/org.eclipse.pde.api.tools.prefs b/org.eclipse.jgit.lfs.server/.settings/org.eclipse.pde.api.tools.prefs
index 112e3c3..c0030de 100644
--- a/org.eclipse.jgit.lfs.server/.settings/org.eclipse.pde.api.tools.prefs
+++ b/org.eclipse.jgit.lfs.server/.settings/org.eclipse.pde.api.tools.prefs
@@ -81,7 +81,7 @@
 METHOD_ELEMENT_TYPE_CHANGED_VARARGS_TO_ARRAY=Error
 METHOD_ELEMENT_TYPE_REMOVED_ANNOTATION_DEFAULT_VALUE=Error
 METHOD_ELEMENT_TYPE_REMOVED_TYPE_PARAMETER=Error
-MISSING_EE_DESCRIPTIONS=Error
+MISSING_EE_DESCRIPTIONS=Warning
 TYPE_PARAMETER_ELEMENT_TYPE_ADDED_CLASS_BOUND=Error
 TYPE_PARAMETER_ELEMENT_TYPE_ADDED_INTERFACE_BOUND=Error
 TYPE_PARAMETER_ELEMENT_TYPE_CHANGED_CLASS_BOUND=Error
diff --git a/org.eclipse.jgit.lfs.server/META-INF/MANIFEST.MF b/org.eclipse.jgit.lfs.server/META-INF/MANIFEST.MF
index 14d3ab8..0448f3a 100644
--- a/org.eclipse.jgit.lfs.server/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.lfs.server/META-INF/MANIFEST.MF
@@ -3,19 +3,19 @@
 Bundle-Name: %plugin_name
 Automatic-Module-Name: org.eclipse.jgit.lfs.server
 Bundle-SymbolicName: org.eclipse.jgit.lfs.server
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
 Bundle-Localization: plugin
 Bundle-Vendor: %provider_name
-Export-Package: org.eclipse.jgit.lfs.server;version="5.0.4";
+Export-Package: org.eclipse.jgit.lfs.server;version="5.1.2";
   uses:="javax.servlet.http,
    org.eclipse.jgit.lfs.lib",
- org.eclipse.jgit.lfs.server.fs;version="5.0.4";
+ org.eclipse.jgit.lfs.server.fs;version="5.1.2";
   uses:="javax.servlet,
    javax.servlet.http,
    org.eclipse.jgit.lfs.server,
    org.eclipse.jgit.lfs.lib",
- org.eclipse.jgit.lfs.server.internal;version="5.0.4";x-internal:=true,
- org.eclipse.jgit.lfs.server.s3;version="5.0.4";
+ org.eclipse.jgit.lfs.server.internal;version="5.1.2";x-internal:=true,
+ org.eclipse.jgit.lfs.server.s3;version="5.1.2";
   uses:="org.eclipse.jgit.lfs.server,
    org.eclipse.jgit.lfs.lib"
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
@@ -25,15 +25,15 @@
  javax.servlet.http;version="[3.1.0,4.0.0)",
  org.apache.http;version="[4.3.0,5.0.0)",
  org.apache.http.client;version="[4.3.0,5.0.0)",
- org.eclipse.jgit.annotations;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.file;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs.errors;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs.internal;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.nls;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport.http;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport.http.apache;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util;version="[5.0.4,5.1.0)",
+ org.eclipse.jgit.annotations;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.file;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs.errors;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs.internal;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.nls;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport.http;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport.http.apache;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util;version="[5.1.2,5.2.0)",
  org.slf4j;version="[1.7.0,2.0.0)"
diff --git a/org.eclipse.jgit.lfs.server/pom.xml b/org.eclipse.jgit.lfs.server/pom.xml
index 7c81c1a..0a9cfb8 100644
--- a/org.eclipse.jgit.lfs.server/pom.xml
+++ b/org.eclipse.jgit.lfs.server/pom.xml
@@ -50,7 +50,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>org.eclipse.jgit-parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <artifactId>org.eclipse.jgit.lfs.server</artifactId>
diff --git a/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/LfsProtocolServlet.java b/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/LfsProtocolServlet.java
index d22d459..c7f55dd 100644
--- a/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/LfsProtocolServlet.java
+++ b/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/LfsProtocolServlet.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.lfs.server;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.apache.http.HttpStatus.SC_FORBIDDEN;
 import static org.apache.http.HttpStatus.SC_INSUFFICIENT_STORAGE;
 import static org.apache.http.HttpStatus.SC_INTERNAL_SERVER_ERROR;
@@ -202,10 +202,10 @@
 	protected void doPost(HttpServletRequest req, HttpServletResponse res)
 			throws ServletException, IOException {
 		Writer w = new BufferedWriter(
-				new OutputStreamWriter(res.getOutputStream(), CHARSET));
+				new OutputStreamWriter(res.getOutputStream(), UTF_8));
 
 		Reader r = new BufferedReader(
-				new InputStreamReader(req.getInputStream(), CHARSET));
+				new InputStreamReader(req.getInputStream(), UTF_8));
 		LfsRequest request = LfsGson.fromJson(r, LfsRequest.class);
 		String path = req.getPathInfo();
 
diff --git a/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/s3/SignerV4.java b/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/s3/SignerV4.java
index 374a560..b21c94e 100644
--- a/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/s3/SignerV4.java
+++ b/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/s3/SignerV4.java
@@ -43,7 +43,7 @@
  */
 package org.eclipse.jgit.lfs.server.s3;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.util.HttpSupport.HDR_AUTHORIZATION;
 
 import java.io.UnsupportedEncodingException;
@@ -359,13 +359,13 @@
 
 	private static byte[] hash(String s) {
 		MessageDigest md = Constants.newMessageDigest();
-		md.update(s.getBytes(CHARSET));
+		md.update(s.getBytes(UTF_8));
 		return md.digest();
 	}
 
 	private static byte[] sign(String stringData, byte[] key) {
 		try {
-			byte[] data = stringData.getBytes(CHARSET);
+			byte[] data = stringData.getBytes(UTF_8);
 			Mac mac = Mac.getInstance(HMACSHA256);
 			mac.init(new SecretKeySpec(key, HMACSHA256));
 			return mac.doFinal(data);
@@ -395,7 +395,7 @@
 	private static String urlEncode(String url, boolean keepPathSlash) {
 		String encoded;
 		try {
-			encoded = URLEncoder.encode(url, CHARSET.name());
+			encoded = URLEncoder.encode(url, UTF_8.name());
 		} catch (UnsupportedEncodingException e) {
 			throw new RuntimeException(LfsServerText.get().unsupportedUtf8, e);
 		}
diff --git a/org.eclipse.jgit.lfs.test/META-INF/MANIFEST.MF b/org.eclipse.jgit.lfs.test/META-INF/MANIFEST.MF
index d8376ce..14e604d 100644
--- a/org.eclipse.jgit.lfs.test/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.lfs.test/META-INF/MANIFEST.MF
@@ -3,23 +3,23 @@
 Bundle-Name: %plugin_name
 Automatic-Module-Name: org.eclipse.jgit.lfs.test
 Bundle-SymbolicName: org.eclipse.jgit.lfs.test
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
 Bundle-Vendor: %provider_name
 Bundle-Localization: plugin
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
-Import-Package: org.eclipse.jgit.internal.storage.dfs;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.junit;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs.errors;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.revwalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.treewalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.treewalk.filter;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util;version="[5.0.4,5.1.0)",
+Import-Package: org.eclipse.jgit.internal.storage.dfs;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.junit;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs.errors;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.revwalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.treewalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.treewalk.filter;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util;version="[5.1.2,5.2.0)",
  org.hamcrest.core;version="[1.1.0,2.0.0)",
  org.junit;version="[4.12,5.0.0)",
  org.junit.runner;version="[4.12,5.0.0)",
  org.junit.runners;version="[4.12,5.0.0)"
-Export-Package: org.eclipse.jgit.lfs.test;version="5.0.4";x-friends:="org.eclipse.jgit.lfs.server.test"
+Export-Package: org.eclipse.jgit.lfs.test;version="5.1.2";x-friends:="org.eclipse.jgit.lfs.server.test"
 
diff --git a/org.eclipse.jgit.lfs.test/pom.xml b/org.eclipse.jgit.lfs.test/pom.xml
index a55cecd..9670b37 100644
--- a/org.eclipse.jgit.lfs.test/pom.xml
+++ b/org.eclipse.jgit.lfs.test/pom.xml
@@ -50,7 +50,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>org.eclipse.jgit-parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <artifactId>org.eclipse.jgit.lfs.test</artifactId>
diff --git a/org.eclipse.jgit.lfs.test/src/org/eclipse/jgit/lfs/test/LongObjectIdTestUtils.java b/org.eclipse.jgit.lfs.test/src/org/eclipse/jgit/lfs/test/LongObjectIdTestUtils.java
index e3c6ef8..c3c3859 100644
--- a/org.eclipse.jgit.lfs.test/src/org/eclipse/jgit/lfs/test/LongObjectIdTestUtils.java
+++ b/org.eclipse.jgit.lfs.test/src/org/eclipse/jgit/lfs/test/LongObjectIdTestUtils.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.lfs.test;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.BufferedInputStream;
 import java.io.FileNotFoundException;
@@ -66,7 +66,7 @@
 	 */
 	public static LongObjectId hash(String s) {
 		MessageDigest md = Constants.newMessageDigest();
-		md.update(s.getBytes(CHARSET));
+		md.update(s.getBytes(UTF_8));
 		return LongObjectId.fromRaw(md.digest());
 	}
 
diff --git a/org.eclipse.jgit.lfs.test/tst/org/eclipse/jgit/lfs/lib/LongObjectIdTest.java b/org.eclipse.jgit.lfs.test/tst/org/eclipse/jgit/lfs/lib/LongObjectIdTest.java
index 8642e7e..92a8176 100644
--- a/org.eclipse.jgit.lfs.test/tst/org/eclipse/jgit/lfs/lib/LongObjectIdTest.java
+++ b/org.eclipse.jgit.lfs.test/tst/org/eclipse/jgit/lfs/lib/LongObjectIdTest.java
@@ -43,6 +43,7 @@
 
 package org.eclipse.jgit.lfs.lib;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static java.nio.charset.StandardCharsets.US_ASCII;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -62,7 +63,6 @@
 import org.eclipse.jgit.junit.JGitTestUtil;
 import org.eclipse.jgit.lfs.errors.InvalidLongObjectIdException;
 import org.eclipse.jgit.lfs.test.LongObjectIdTestUtils;
-import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.util.FileUtils;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
@@ -393,7 +393,7 @@
 		AnyLongObjectId id1 = LongObjectIdTestUtils.hash("test");
 		ByteArrayOutputStream os = new ByteArrayOutputStream(64);
 		try (OutputStreamWriter w = new OutputStreamWriter(os,
-				Constants.CHARSET)) {
+				UTF_8)) {
 			id1.copyTo(w);
 		}
 		assertEquals(id1, LongObjectId.fromString(os.toByteArray(), 0));
@@ -404,7 +404,7 @@
 		AnyLongObjectId id1 = LongObjectIdTestUtils.hash("test");
 		ByteArrayOutputStream os = new ByteArrayOutputStream(64);
 		try (OutputStreamWriter w = new OutputStreamWriter(os,
-				Constants.CHARSET)) {
+				UTF_8)) {
 			char[] buf = new char[64];
 			id1.copyTo(buf, w);
 		}
diff --git a/org.eclipse.jgit.lfs/.settings/org.eclipse.pde.api.tools.prefs b/org.eclipse.jgit.lfs/.settings/org.eclipse.pde.api.tools.prefs
index 112e3c3..c0030de 100644
--- a/org.eclipse.jgit.lfs/.settings/org.eclipse.pde.api.tools.prefs
+++ b/org.eclipse.jgit.lfs/.settings/org.eclipse.pde.api.tools.prefs
@@ -81,7 +81,7 @@
 METHOD_ELEMENT_TYPE_CHANGED_VARARGS_TO_ARRAY=Error
 METHOD_ELEMENT_TYPE_REMOVED_ANNOTATION_DEFAULT_VALUE=Error
 METHOD_ELEMENT_TYPE_REMOVED_TYPE_PARAMETER=Error
-MISSING_EE_DESCRIPTIONS=Error
+MISSING_EE_DESCRIPTIONS=Warning
 TYPE_PARAMETER_ELEMENT_TYPE_ADDED_CLASS_BOUND=Error
 TYPE_PARAMETER_ELEMENT_TYPE_ADDED_INTERFACE_BOUND=Error
 TYPE_PARAMETER_ELEMENT_TYPE_CHANGED_CLASS_BOUND=Error
diff --git a/org.eclipse.jgit.lfs/META-INF/MANIFEST.MF b/org.eclipse.jgit.lfs/META-INF/MANIFEST.MF
index 3e1e221..22172a9 100644
--- a/org.eclipse.jgit.lfs/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.lfs/META-INF/MANIFEST.MF
@@ -3,34 +3,33 @@
 Bundle-Name: %plugin_name
 Automatic-Module-Name: org.eclipse.jgit.lfs
 Bundle-SymbolicName: org.eclipse.jgit.lfs
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
 Bundle-Localization: plugin
 Bundle-Vendor: %provider_name
-Export-Package: org.eclipse.jgit.lfs;version="5.0.4",
- org.eclipse.jgit.lfs.errors;version="5.0.4",
- org.eclipse.jgit.lfs.internal;version="5.0.4";x-friends:="org.eclipse.jgit.lfs.test,org.eclipse.jgit.lfs.server.fs,org.eclipse.jgit.lfs.server",
- org.eclipse.jgit.lfs.lib;version="5.0.4"
+Export-Package: org.eclipse.jgit.lfs;version="5.1.2",
+ org.eclipse.jgit.lfs.errors;version="5.1.2",
+ org.eclipse.jgit.lfs.internal;version="5.1.2";x-friends:="org.eclipse.jgit.lfs.test,org.eclipse.jgit.lfs.server.fs,org.eclipse.jgit.lfs.server",
+ org.eclipse.jgit.lfs.lib;version="5.1.2"
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
 Import-Package: com.google.gson;version="[2.8.2,3.0.0)",
  com.google.gson.stream;version="[2.8.2,3.0.0)",
  org.apache.http.impl.client;version="[4.2.6,5.0.0)",
  org.apache.http.impl.conn;version="[4.2.6,5.0.0)",
- org.eclipse.jgit.annotations;version="[5.0.4,5.1.0)";resolution:=optional,
- org.eclipse.jgit.api.errors;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.attributes;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.diff;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.errors;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.hooks;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.file;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.nls;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.revwalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.storage.file;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.storage.pack;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport.http;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.treewalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.treewalk.filter;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util.io;version="[5.0.4,5.1.0)",
- org.slf4j;version="[1.7.0,2.0.0)"
+ org.eclipse.jgit.annotations;version="[5.1.2,5.2.0)";resolution:=optional,
+ org.eclipse.jgit.api.errors;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.attributes;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.diff;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.errors;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.hooks;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.file;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.nls;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.revwalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.storage.file;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.storage.pack;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport.http;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.treewalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.treewalk.filter;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util.io;version="[5.1.2,5.2.0)"
diff --git a/org.eclipse.jgit.lfs/pom.xml b/org.eclipse.jgit.lfs/pom.xml
index c231692..8384fbf 100644
--- a/org.eclipse.jgit.lfs/pom.xml
+++ b/org.eclipse.jgit.lfs/pom.xml
@@ -50,7 +50,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>org.eclipse.jgit-parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <artifactId>org.eclipse.jgit.lfs</artifactId>
diff --git a/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/LfsPointer.java b/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/LfsPointer.java
index 4f95940..0e3830c 100644
--- a/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/LfsPointer.java
+++ b/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/LfsPointer.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.lfs;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.BufferedReader;
 import java.io.IOException;
@@ -134,7 +134,7 @@
 	 */
 	public void encode(OutputStream out) {
 		try (PrintStream ps = new PrintStream(out, false,
-				CHARSET.name())) {
+				UTF_8.name())) {
 			ps.print("version "); //$NON-NLS-1$
 			ps.print(VERSION + "\n"); //$NON-NLS-1$
 			ps.print("oid " + HASH_FUNCTION_NAME + ":"); //$NON-NLS-1$ //$NON-NLS-2$
@@ -143,7 +143,7 @@
 			ps.print(size + "\n"); //$NON-NLS-1$
 		} catch (UnsupportedEncodingException e) {
 			// should not happen, we are using a standard charset
-			throw new UnsupportedCharsetException(CHARSET.name());
+			throw new UnsupportedCharsetException(UTF_8.name());
 		}
 	}
 
@@ -165,7 +165,7 @@
 		long sz = -1;
 
 		try (BufferedReader br = new BufferedReader(
-				new InputStreamReader(in, CHARSET))) {
+				new InputStreamReader(in, UTF_8))) {
 			for (String s = br.readLine(); s != null; s = br.readLine()) {
 				if (s.startsWith("#") || s.length() == 0) { //$NON-NLS-1$
 					continue;
diff --git a/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/LfsPrePushHook.java b/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/LfsPrePushHook.java
index de4449f..3e6a261 100644
--- a/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/LfsPrePushHook.java
+++ b/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/LfsPrePushHook.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.lfs;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.lfs.Protocol.OPERATION_UPLOAD;
 import static org.eclipse.jgit.lfs.internal.LfsConnectionFactory.toRequest;
 import static org.eclipse.jgit.transport.http.HttpConnection.HTTP_OK;
@@ -201,14 +201,14 @@
 
 	private Map<String, LfsPointer> requestBatchUpload(HttpConnection api,
 			Set<LfsPointer> toPush) throws IOException {
-		LfsPointer[] res = toPush.toArray(new LfsPointer[toPush.size()]);
+		LfsPointer[] res = toPush.toArray(new LfsPointer[0]);
 		Map<String, LfsPointer> oidStr2ptr = new HashMap<>();
 		for (LfsPointer p : res) {
 			oidStr2ptr.put(p.getOid().name(), p);
 		}
 		Gson gson = Protocol.gson();
 		api.getOutputStream().write(
-				gson.toJson(toRequest(OPERATION_UPLOAD, res)).getBytes(CHARSET));
+				gson.toJson(toRequest(OPERATION_UPLOAD, res)).getBytes(UTF_8));
 		int responseCode = api.getResponseCode();
 		if (responseCode != HTTP_OK) {
 			throw new IOException(
@@ -221,7 +221,7 @@
 	private void uploadContents(HttpConnection api,
 			Map<String, LfsPointer> oid2ptr) throws IOException {
 		try (JsonReader reader = new JsonReader(
-				new InputStreamReader(api.getInputStream()))) {
+				new InputStreamReader(api.getInputStream(), UTF_8))) {
 			for (Protocol.ObjectInfo o : parseObjects(reader)) {
 				if (o.actions == null) {
 					continue;
diff --git a/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/SmudgeFilter.java b/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/SmudgeFilter.java
index 6bff12f..fac87c1 100644
--- a/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/SmudgeFilter.java
+++ b/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/SmudgeFilter.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.lfs;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.IOException;
 import java.io.InputStream;
@@ -170,7 +170,7 @@
 				.write(gson
 						.toJson(LfsConnectionFactory
 								.toRequest(Protocol.OPERATION_DOWNLOAD, res))
-						.getBytes(CHARSET));
+						.getBytes(UTF_8));
 		int responseCode = lfsServerConn.getResponseCode();
 		if (responseCode != HttpConnection.HTTP_OK) {
 			throw new IOException(
@@ -179,7 +179,8 @@
 							Integer.valueOf(responseCode)));
 		}
 		try (JsonReader reader = new JsonReader(
-				new InputStreamReader(lfsServerConn.getInputStream()))) {
+				new InputStreamReader(lfsServerConn.getInputStream(),
+						UTF_8))) {
 			Protocol.Response resp = gson.fromJson(reader,
 					Protocol.Response.class);
 			for (Protocol.ObjectInfo o : resp.objects) {
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.feature/feature.xml b/org.eclipse.jgit.packaging/org.eclipse.jgit.feature/feature.xml
index d09852b..3fde8c8 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.feature/feature.xml
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.feature/feature.xml
@@ -2,7 +2,7 @@
 <feature
       id="org.eclipse.jgit"
       label="%featureName"
-      version="5.0.4.qualifier"
+      version="5.1.2.qualifier"
       provider-name="%providerName">
 
    <description url="http://www.eclipse.org/jgit/">
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.feature/pom.xml b/org.eclipse.jgit.packaging/org.eclipse.jgit.feature/pom.xml
index a9a58af..ff55786 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.feature/pom.xml
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.feature/pom.xml
@@ -50,7 +50,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>jgit.tycho.parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <groupId>org.eclipse.jgit.feature</groupId>
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.http.apache.feature/feature.xml b/org.eclipse.jgit.packaging/org.eclipse.jgit.http.apache.feature/feature.xml
index 485fd6b..5aed14f 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.http.apache.feature/feature.xml
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.http.apache.feature/feature.xml
@@ -2,7 +2,7 @@
 <feature
       id="org.eclipse.jgit.http.apache"
       label="%featureName"
-      version="5.0.4.qualifier"
+      version="5.1.2.qualifier"
       provider-name="%providerName">
 
    <description url="http://www.eclipse.org/jgit/">
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.http.apache.feature/pom.xml b/org.eclipse.jgit.packaging/org.eclipse.jgit.http.apache.feature/pom.xml
index d148ac3..254b10d 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.http.apache.feature/pom.xml
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.http.apache.feature/pom.xml
@@ -50,7 +50,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>jgit.tycho.parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <groupId>org.eclipse.jgit.feature</groupId>
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.junit.feature/feature.xml b/org.eclipse.jgit.packaging/org.eclipse.jgit.junit.feature/feature.xml
index 6551330..30bbebc 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.junit.feature/feature.xml
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.junit.feature/feature.xml
@@ -2,7 +2,7 @@
 <feature
       id="org.eclipse.jgit.junit"
       label="%featureName"
-      version="5.0.4.qualifier"
+      version="5.1.2.qualifier"
       provider-name="%providerName">
 
    <description url="http://www.eclipse.org/jgit/">
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.junit.feature/pom.xml b/org.eclipse.jgit.packaging/org.eclipse.jgit.junit.feature/pom.xml
index f65326e..2ba32e4 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.junit.feature/pom.xml
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.junit.feature/pom.xml
@@ -50,7 +50,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>jgit.tycho.parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <groupId>org.eclipse.jgit.feature</groupId>
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.lfs.feature/feature.xml b/org.eclipse.jgit.packaging/org.eclipse.jgit.lfs.feature/feature.xml
index 72e15da..9886e2f 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.lfs.feature/feature.xml
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.lfs.feature/feature.xml
@@ -2,7 +2,7 @@
 <feature
       id="org.eclipse.jgit.lfs"
       label="%featureName"
-      version="5.0.4.qualifier"
+      version="5.1.2.qualifier"
       provider-name="%providerName">
 
    <description url="http://www.eclipse.org/jgit/">
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.lfs.feature/pom.xml b/org.eclipse.jgit.packaging/org.eclipse.jgit.lfs.feature/pom.xml
index 35a4fda..a0cde81 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.lfs.feature/pom.xml
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.lfs.feature/pom.xml
@@ -50,7 +50,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>jgit.tycho.parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <groupId>org.eclipse.jgit.feature</groupId>
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.pgm.feature/feature.xml b/org.eclipse.jgit.packaging/org.eclipse.jgit.pgm.feature/feature.xml
index 18a7d1a..ba541c2 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.pgm.feature/feature.xml
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.pgm.feature/feature.xml
@@ -2,7 +2,7 @@
 <feature
       id="org.eclipse.jgit.pgm"
       label="%featureName"
-      version="5.0.4.qualifier"
+      version="5.1.2.qualifier"
       provider-name="%providerName">
 
    <description url="http://www.eclipse.org/jgit/">
@@ -31,8 +31,8 @@
          version="0.0.0"/>
 
    <requires>
-      <import feature="org.eclipse.jgit" version="5.0.4" match="equivalent"/>
-      <import feature="org.eclipse.jgit.lfs" version="5.0.4" match="equivalent"/>
+      <import feature="org.eclipse.jgit" version="5.1.2" match="equivalent"/>
+      <import feature="org.eclipse.jgit.lfs" version="5.1.2" match="equivalent"/>
    </requires>
 
    <plugin
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.pgm.feature/pom.xml b/org.eclipse.jgit.packaging/org.eclipse.jgit.pgm.feature/pom.xml
index 73a7d3f..971ea72 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.pgm.feature/pom.xml
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.pgm.feature/pom.xml
@@ -50,7 +50,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>jgit.tycho.parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <groupId>org.eclipse.jgit.feature</groupId>
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.pgm.source.feature/feature.xml b/org.eclipse.jgit.packaging/org.eclipse.jgit.pgm.source.feature/feature.xml
index 810d018..044974c 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.pgm.source.feature/feature.xml
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.pgm.source.feature/feature.xml
@@ -2,7 +2,7 @@
 <feature
       id="org.eclipse.jgit.pgm.source"
       label="%featureName"
-      version="5.0.4.qualifier"
+      version="5.1.2.qualifier"
       provider-name="%providerName">
 
    <description url="http://www.eclipse.org/jgit/">
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.pgm.source.feature/pom.xml b/org.eclipse.jgit.packaging/org.eclipse.jgit.pgm.source.feature/pom.xml
index 88b8ce9..90ea49d 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.pgm.source.feature/pom.xml
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.pgm.source.feature/pom.xml
@@ -50,7 +50,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>jgit.tycho.parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <groupId>org.eclipse.jgit.feature</groupId>
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.repository/pom.xml b/org.eclipse.jgit.packaging/org.eclipse.jgit.repository/pom.xml
index c8c3b51..549ff45 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.repository/pom.xml
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.repository/pom.xml
@@ -50,7 +50,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>jgit.tycho.parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <artifactId>org.eclipse.jgit.repository</artifactId>
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.source.feature/feature.xml b/org.eclipse.jgit.packaging/org.eclipse.jgit.source.feature/feature.xml
index 12d6fe3..390af58 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.source.feature/feature.xml
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.source.feature/feature.xml
@@ -2,7 +2,7 @@
 <feature
       id="org.eclipse.jgit.source"
       label="%featureName"
-      version="5.0.4.qualifier"
+      version="5.1.2.qualifier"
       provider-name="%providerName">
 
    <description url="http://www.eclipse.org/jgit/">
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.source.feature/pom.xml b/org.eclipse.jgit.packaging/org.eclipse.jgit.source.feature/pom.xml
index 7c83241..ec49a0d 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.source.feature/pom.xml
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.source.feature/pom.xml
@@ -50,7 +50,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>jgit.tycho.parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <groupId>org.eclipse.jgit.feature</groupId>
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/META-INF/MANIFEST.MF b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/META-INF/MANIFEST.MF
index fc7dfa6..08596db 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/META-INF/MANIFEST.MF
@@ -2,4 +2,4 @@
 Bundle-ManifestVersion: 2
 Bundle-Name: JGit Target Platform Bundle
 Bundle-SymbolicName: org.eclipse.jgit.target
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.5.target b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.5.target
index dfb5a8f..28ebdbf 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.5.target
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.5.target
@@ -1,40 +1,40 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <?pde?>
 <!-- generated with https://github.com/mbarbero/fr.obeo.releng.targetplatform -->
-<target name="jgit-4.5" sequenceNumber="1535179254">
+<target name="jgit-4.5" sequenceNumber="1536523000">
   <locations>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
-      <unit id="org.eclipse.jetty.client" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.client.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.continuation" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.continuation.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.http" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.http.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.io" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.io.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.security" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.security.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.server" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.server.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.servlet" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.servlet.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.util" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.util.source" version="9.4.8.v20171121"/>
-      <repository id="jetty-9.4.8" location="http://download.eclipse.org/jetty/updates/jetty-bundles-9.x/9.4.8.v20171121"/>
+      <unit id="org.eclipse.jetty.client" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.client.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.continuation" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.continuation.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.http" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.http.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.io" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.io.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.security" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.security.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.server" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.server.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.servlet" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.servlet.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.util" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.util.source" version="9.4.11.v20180605"/>
+      <repository id="jetty-9.4.11" location="http://download.eclipse.org/jetty/updates/jetty-bundles-9.x/9.4.11.v20180605"/>
     </location>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
       <unit id="org.apache.ant" version="1.9.6.v201510161327"/>
       <unit id="org.apache.ant.source" version="1.9.6.v201510161327"/>
-      <unit id="org.apache.commons.codec" version="1.9.0.v20170208-1614"/>
-      <unit id="org.apache.commons.codec.source" version="1.9.0.v20170208-1614"/>
+      <unit id="org.apache.commons.codec" version="1.10.0.v20180409-1845"/>
+      <unit id="org.apache.commons.codec.source" version="1.10.0.v20180409-1845"/>
       <unit id="org.apache.commons.compress" version="1.15.0.v20180119-1613"/>
       <unit id="org.apache.commons.compress.source" version="1.15.0.v20180119-1613"/>
-      <unit id="org.apache.commons.logging" version="1.1.1.v201101211721"/>
-      <unit id="org.apache.commons.logging.source" version="1.1.1.v201101211721"/>
-      <unit id="org.apache.httpcomponents.httpcore" version="4.4.6.v20170210-0925"/>
-      <unit id="org.apache.httpcomponents.httpcore.source" version="4.4.6.v20170210-0925"/>
-      <unit id="org.apache.httpcomponents.httpclient" version="4.5.2.v20180410-1551"/>
-      <unit id="org.apache.httpcomponents.httpclient.source" version="4.5.2.v20180410-1551"/>
+      <unit id="org.apache.commons.logging" version="1.2.0.v20180409-1502"/>
+      <unit id="org.apache.commons.logging.source" version="1.2.0.v20180409-1502"/>
+      <unit id="org.apache.httpcomponents.httpclient" version="4.5.5.v20180409-1525"/>
+      <unit id="org.apache.httpcomponents.httpclient.source" version="4.5.5.v20180409-1525"/>
+      <unit id="org.apache.httpcomponents.httpcore" version="4.4.9.v20180409-1525"/>
+      <unit id="org.apache.httpcomponents.httpcore.source" version="4.4.9.v20180409-1525"/>
       <unit id="org.apache.log4j" version="1.2.15.v201012070815"/>
       <unit id="org.apache.log4j.source" version="1.2.15.v201012070815"/>
       <unit id="org.kohsuke.args4j" version="2.33.0.v20160323-2218"/>
@@ -66,7 +66,7 @@
       <unit id="org.slf4j.impl.log4j12.source" version="1.7.2.v20131105-2200"/>
       <unit id="com.jcraft.jzlib" version="1.1.1.v201205102305"/>
       <unit id="com.jcraft.jzlib.source" version="1.1.1.v201205102305"/>
-      <repository location="http://download.eclipse.org/tools/orbit/downloads/drops/R20180606145124/repository"/>
+      <repository location="http://download.eclipse.org/tools/orbit/downloads/drops/R20180905201904/repository"/>
     </location>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
       <unit id="org.eclipse.osgi" version="0.0.0"/>
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.5.tpd b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.5.tpd
index c85343c..8e65c98 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.5.tpd
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.5.tpd
@@ -1,7 +1,7 @@
 target "jgit-4.5" with source configurePhase
 
-include "projects/jetty-9.4.8.tpd"
-include "orbit/R20180606145124-Photon.tpd"
+include "projects/jetty-9.4.11.tpd"
+include "orbit/R20180905201904-2018-09.tpd"
 
 location "http://download.eclipse.org/releases/mars/" {
 	org.eclipse.osgi lazy
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.6.target b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.6.target
index dbfd694..8490e55 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.6.target
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.6.target
@@ -1,40 +1,40 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <?pde?>
 <!-- generated with https://github.com/mbarbero/fr.obeo.releng.targetplatform -->
-<target name="jgit-4.6" sequenceNumber="1535179241">
+<target name="jgit-4.6" sequenceNumber="1536522989">
   <locations>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
-      <unit id="org.eclipse.jetty.client" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.client.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.continuation" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.continuation.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.http" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.http.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.io" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.io.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.security" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.security.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.server" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.server.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.servlet" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.servlet.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.util" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.util.source" version="9.4.8.v20171121"/>
-      <repository id="jetty-9.4.8" location="http://download.eclipse.org/jetty/updates/jetty-bundles-9.x/9.4.8.v20171121"/>
+      <unit id="org.eclipse.jetty.client" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.client.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.continuation" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.continuation.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.http" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.http.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.io" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.io.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.security" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.security.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.server" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.server.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.servlet" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.servlet.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.util" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.util.source" version="9.4.11.v20180605"/>
+      <repository id="jetty-9.4.11" location="http://download.eclipse.org/jetty/updates/jetty-bundles-9.x/9.4.11.v20180605"/>
     </location>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
       <unit id="org.apache.ant" version="1.9.6.v201510161327"/>
       <unit id="org.apache.ant.source" version="1.9.6.v201510161327"/>
-      <unit id="org.apache.commons.codec" version="1.9.0.v20170208-1614"/>
-      <unit id="org.apache.commons.codec.source" version="1.9.0.v20170208-1614"/>
+      <unit id="org.apache.commons.codec" version="1.10.0.v20180409-1845"/>
+      <unit id="org.apache.commons.codec.source" version="1.10.0.v20180409-1845"/>
       <unit id="org.apache.commons.compress" version="1.15.0.v20180119-1613"/>
       <unit id="org.apache.commons.compress.source" version="1.15.0.v20180119-1613"/>
-      <unit id="org.apache.commons.logging" version="1.1.1.v201101211721"/>
-      <unit id="org.apache.commons.logging.source" version="1.1.1.v201101211721"/>
-      <unit id="org.apache.httpcomponents.httpcore" version="4.4.6.v20170210-0925"/>
-      <unit id="org.apache.httpcomponents.httpcore.source" version="4.4.6.v20170210-0925"/>
-      <unit id="org.apache.httpcomponents.httpclient" version="4.5.2.v20180410-1551"/>
-      <unit id="org.apache.httpcomponents.httpclient.source" version="4.5.2.v20180410-1551"/>
+      <unit id="org.apache.commons.logging" version="1.2.0.v20180409-1502"/>
+      <unit id="org.apache.commons.logging.source" version="1.2.0.v20180409-1502"/>
+      <unit id="org.apache.httpcomponents.httpclient" version="4.5.5.v20180409-1525"/>
+      <unit id="org.apache.httpcomponents.httpclient.source" version="4.5.5.v20180409-1525"/>
+      <unit id="org.apache.httpcomponents.httpcore" version="4.4.9.v20180409-1525"/>
+      <unit id="org.apache.httpcomponents.httpcore.source" version="4.4.9.v20180409-1525"/>
       <unit id="org.apache.log4j" version="1.2.15.v201012070815"/>
       <unit id="org.apache.log4j.source" version="1.2.15.v201012070815"/>
       <unit id="org.kohsuke.args4j" version="2.33.0.v20160323-2218"/>
@@ -66,7 +66,7 @@
       <unit id="org.slf4j.impl.log4j12.source" version="1.7.2.v20131105-2200"/>
       <unit id="com.jcraft.jzlib" version="1.1.1.v201205102305"/>
       <unit id="com.jcraft.jzlib.source" version="1.1.1.v201205102305"/>
-      <repository location="http://download.eclipse.org/tools/orbit/downloads/drops/R20180606145124/repository"/>
+      <repository location="http://download.eclipse.org/tools/orbit/downloads/drops/R20180905201904/repository"/>
     </location>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
       <unit id="org.eclipse.osgi" version="0.0.0"/>
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.6.tpd b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.6.tpd
index 3c2a910..44c846e 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.6.tpd
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.6.tpd
@@ -1,7 +1,7 @@
 target "jgit-4.6" with source configurePhase
 
-include "projects/jetty-9.4.8.tpd"
-include "orbit/R20180606145124-Photon.tpd"
+include "projects/jetty-9.4.11.tpd"
+include "orbit/R20180905201904-2018-09.tpd"
 
 location "http://download.eclipse.org/releases/neon/" {
 	org.eclipse.osgi lazy
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.7.target b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.7.target
index be7719d..a6651b8 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.7.target
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.7.target
@@ -1,40 +1,40 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <?pde?>
 <!-- generated with https://github.com/mbarbero/fr.obeo.releng.targetplatform -->
-<target name="jgit-4.7" sequenceNumber="1535179221">
+<target name="jgit-4.7" sequenceNumber="1536522970">
   <locations>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
-      <unit id="org.eclipse.jetty.client" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.client.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.continuation" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.continuation.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.http" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.http.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.io" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.io.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.security" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.security.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.server" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.server.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.servlet" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.servlet.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.util" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.util.source" version="9.4.8.v20171121"/>
-      <repository id="jetty-9.4.8" location="http://download.eclipse.org/jetty/updates/jetty-bundles-9.x/9.4.8.v20171121"/>
+      <unit id="org.eclipse.jetty.client" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.client.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.continuation" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.continuation.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.http" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.http.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.io" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.io.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.security" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.security.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.server" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.server.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.servlet" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.servlet.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.util" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.util.source" version="9.4.11.v20180605"/>
+      <repository id="jetty-9.4.11" location="http://download.eclipse.org/jetty/updates/jetty-bundles-9.x/9.4.11.v20180605"/>
     </location>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
       <unit id="org.apache.ant" version="1.9.6.v201510161327"/>
       <unit id="org.apache.ant.source" version="1.9.6.v201510161327"/>
-      <unit id="org.apache.commons.codec" version="1.9.0.v20170208-1614"/>
-      <unit id="org.apache.commons.codec.source" version="1.9.0.v20170208-1614"/>
+      <unit id="org.apache.commons.codec" version="1.10.0.v20180409-1845"/>
+      <unit id="org.apache.commons.codec.source" version="1.10.0.v20180409-1845"/>
       <unit id="org.apache.commons.compress" version="1.15.0.v20180119-1613"/>
       <unit id="org.apache.commons.compress.source" version="1.15.0.v20180119-1613"/>
-      <unit id="org.apache.commons.logging" version="1.1.1.v201101211721"/>
-      <unit id="org.apache.commons.logging.source" version="1.1.1.v201101211721"/>
-      <unit id="org.apache.httpcomponents.httpcore" version="4.4.6.v20170210-0925"/>
-      <unit id="org.apache.httpcomponents.httpcore.source" version="4.4.6.v20170210-0925"/>
-      <unit id="org.apache.httpcomponents.httpclient" version="4.5.2.v20180410-1551"/>
-      <unit id="org.apache.httpcomponents.httpclient.source" version="4.5.2.v20180410-1551"/>
+      <unit id="org.apache.commons.logging" version="1.2.0.v20180409-1502"/>
+      <unit id="org.apache.commons.logging.source" version="1.2.0.v20180409-1502"/>
+      <unit id="org.apache.httpcomponents.httpclient" version="4.5.5.v20180409-1525"/>
+      <unit id="org.apache.httpcomponents.httpclient.source" version="4.5.5.v20180409-1525"/>
+      <unit id="org.apache.httpcomponents.httpcore" version="4.4.9.v20180409-1525"/>
+      <unit id="org.apache.httpcomponents.httpcore.source" version="4.4.9.v20180409-1525"/>
       <unit id="org.apache.log4j" version="1.2.15.v201012070815"/>
       <unit id="org.apache.log4j.source" version="1.2.15.v201012070815"/>
       <unit id="org.kohsuke.args4j" version="2.33.0.v20160323-2218"/>
@@ -66,7 +66,7 @@
       <unit id="org.slf4j.impl.log4j12.source" version="1.7.2.v20131105-2200"/>
       <unit id="com.jcraft.jzlib" version="1.1.1.v201205102305"/>
       <unit id="com.jcraft.jzlib.source" version="1.1.1.v201205102305"/>
-      <repository location="http://download.eclipse.org/tools/orbit/downloads/drops/R20180606145124/repository"/>
+      <repository location="http://download.eclipse.org/tools/orbit/downloads/drops/R20180905201904/repository"/>
     </location>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
       <unit id="org.eclipse.osgi" version="0.0.0"/>
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.7.tpd b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.7.tpd
index 4e543ff..b63955f 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.7.tpd
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.7.tpd
@@ -1,7 +1,7 @@
 target "jgit-4.7" with source configurePhase
 
-include "projects/jetty-9.4.8.tpd"
-include "orbit/R20180606145124-Photon.tpd"
+include "projects/jetty-9.4.11.tpd"
+include "orbit/R20180905201904-2018-09.tpd"
 
 location "http://download.eclipse.org/releases/oxygen/" {
 	org.eclipse.osgi lazy
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.8.target b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.8.target
index 3de172b..7adb7da 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.8.target
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.8.target
@@ -1,40 +1,40 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <?pde?>
 <!-- generated with https://github.com/mbarbero/fr.obeo.releng.targetplatform -->
-<target name="jgit-4.8" sequenceNumber="1535179205">
+<target name="jgit-4.8" sequenceNumber="1536522959">
   <locations>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
-      <unit id="org.eclipse.jetty.client" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.client.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.continuation" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.continuation.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.http" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.http.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.io" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.io.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.security" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.security.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.server" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.server.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.servlet" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.servlet.source" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.util" version="9.4.8.v20171121"/>
-      <unit id="org.eclipse.jetty.util.source" version="9.4.8.v20171121"/>
-      <repository id="jetty-9.4.8" location="http://download.eclipse.org/jetty/updates/jetty-bundles-9.x/9.4.8.v20171121"/>
+      <unit id="org.eclipse.jetty.client" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.client.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.continuation" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.continuation.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.http" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.http.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.io" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.io.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.security" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.security.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.server" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.server.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.servlet" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.servlet.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.util" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.util.source" version="9.4.11.v20180605"/>
+      <repository id="jetty-9.4.11" location="http://download.eclipse.org/jetty/updates/jetty-bundles-9.x/9.4.11.v20180605"/>
     </location>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
       <unit id="org.apache.ant" version="1.9.6.v201510161327"/>
       <unit id="org.apache.ant.source" version="1.9.6.v201510161327"/>
-      <unit id="org.apache.commons.codec" version="1.9.0.v20170208-1614"/>
-      <unit id="org.apache.commons.codec.source" version="1.9.0.v20170208-1614"/>
+      <unit id="org.apache.commons.codec" version="1.10.0.v20180409-1845"/>
+      <unit id="org.apache.commons.codec.source" version="1.10.0.v20180409-1845"/>
       <unit id="org.apache.commons.compress" version="1.15.0.v20180119-1613"/>
       <unit id="org.apache.commons.compress.source" version="1.15.0.v20180119-1613"/>
-      <unit id="org.apache.commons.logging" version="1.1.1.v201101211721"/>
-      <unit id="org.apache.commons.logging.source" version="1.1.1.v201101211721"/>
-      <unit id="org.apache.httpcomponents.httpcore" version="4.4.6.v20170210-0925"/>
-      <unit id="org.apache.httpcomponents.httpcore.source" version="4.4.6.v20170210-0925"/>
-      <unit id="org.apache.httpcomponents.httpclient" version="4.5.2.v20180410-1551"/>
-      <unit id="org.apache.httpcomponents.httpclient.source" version="4.5.2.v20180410-1551"/>
+      <unit id="org.apache.commons.logging" version="1.2.0.v20180409-1502"/>
+      <unit id="org.apache.commons.logging.source" version="1.2.0.v20180409-1502"/>
+      <unit id="org.apache.httpcomponents.httpclient" version="4.5.5.v20180409-1525"/>
+      <unit id="org.apache.httpcomponents.httpclient.source" version="4.5.5.v20180409-1525"/>
+      <unit id="org.apache.httpcomponents.httpcore" version="4.4.9.v20180409-1525"/>
+      <unit id="org.apache.httpcomponents.httpcore.source" version="4.4.9.v20180409-1525"/>
       <unit id="org.apache.log4j" version="1.2.15.v201012070815"/>
       <unit id="org.apache.log4j.source" version="1.2.15.v201012070815"/>
       <unit id="org.kohsuke.args4j" version="2.33.0.v20160323-2218"/>
@@ -66,7 +66,7 @@
       <unit id="org.slf4j.impl.log4j12.source" version="1.7.2.v20131105-2200"/>
       <unit id="com.jcraft.jzlib" version="1.1.1.v201205102305"/>
       <unit id="com.jcraft.jzlib.source" version="1.1.1.v201205102305"/>
-      <repository location="http://download.eclipse.org/tools/orbit/downloads/drops/R20180606145124/repository"/>
+      <repository location="http://download.eclipse.org/tools/orbit/downloads/drops/R20180905201904/repository"/>
     </location>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
       <unit id="org.eclipse.osgi" version="0.0.0"/>
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.8.tpd b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.8.tpd
index 0ea2b99..4e41ad9 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.8.tpd
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.8.tpd
@@ -1,7 +1,7 @@
 target "jgit-4.8" with source configurePhase
 
-include "projects/jetty-9.4.8.tpd"
-include "orbit/R20180606145124-Photon.tpd"
+include "projects/jetty-9.4.11.tpd"
+include "orbit/R20180905201904-2018-09.tpd"
 
 location "http://download.eclipse.org/releases/photon/" {
 	org.eclipse.osgi lazy
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.9-staging.target b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.9-staging.target
new file mode 100644
index 0000000..bdabdff
--- /dev/null
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.9-staging.target
@@ -0,0 +1,76 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<?pde?>
+<!-- generated with https://github.com/mbarbero/fr.obeo.releng.targetplatform -->
+<target name="jgit-4.9-staging" sequenceNumber="1536522948">
+  <locations>
+    <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
+      <unit id="org.eclipse.jetty.client" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.client.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.continuation" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.continuation.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.http" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.http.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.io" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.io.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.security" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.security.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.server" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.server.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.servlet" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.servlet.source" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.util" version="9.4.11.v20180605"/>
+      <unit id="org.eclipse.jetty.util.source" version="9.4.11.v20180605"/>
+      <repository id="jetty-9.4.11" location="http://download.eclipse.org/jetty/updates/jetty-bundles-9.x/9.4.11.v20180605"/>
+    </location>
+    <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
+      <unit id="org.apache.ant" version="1.9.6.v201510161327"/>
+      <unit id="org.apache.ant.source" version="1.9.6.v201510161327"/>
+      <unit id="org.apache.commons.codec" version="1.10.0.v20180409-1845"/>
+      <unit id="org.apache.commons.codec.source" version="1.10.0.v20180409-1845"/>
+      <unit id="org.apache.commons.compress" version="1.15.0.v20180119-1613"/>
+      <unit id="org.apache.commons.compress.source" version="1.15.0.v20180119-1613"/>
+      <unit id="org.apache.commons.logging" version="1.2.0.v20180409-1502"/>
+      <unit id="org.apache.commons.logging.source" version="1.2.0.v20180409-1502"/>
+      <unit id="org.apache.httpcomponents.httpclient" version="4.5.5.v20180409-1525"/>
+      <unit id="org.apache.httpcomponents.httpclient.source" version="4.5.5.v20180409-1525"/>
+      <unit id="org.apache.httpcomponents.httpcore" version="4.4.9.v20180409-1525"/>
+      <unit id="org.apache.httpcomponents.httpcore.source" version="4.4.9.v20180409-1525"/>
+      <unit id="org.apache.log4j" version="1.2.15.v201012070815"/>
+      <unit id="org.apache.log4j.source" version="1.2.15.v201012070815"/>
+      <unit id="org.kohsuke.args4j" version="2.33.0.v20160323-2218"/>
+      <unit id="org.kohsuke.args4j.source" version="2.33.0.v20160323-2218"/>
+      <unit id="org.hamcrest" version="1.1.0.v20090501071000"/>
+      <unit id="org.hamcrest.core" version="1.3.0.v20180420-1519"/>
+      <unit id="org.hamcrest.core.source" version="1.3.0.v20180420-1519"/>
+      <unit id="org.hamcrest.library" version="1.3.0.v20180524-2246"/>
+      <unit id="org.hamcrest.library.source" version="1.3.0.v20180524-2246"/>
+      <unit id="javaewah" version="1.1.6.v20160919-1400"/>
+      <unit id="javaewah.source" version="1.1.6.v20160919-1400"/>
+      <unit id="org.objenesis" version="1.0.0.v201505121915"/>
+      <unit id="org.objenesis.source" version="1.0.0.v201505121915"/>
+      <unit id="org.mockito" version="1.8.4.v201303031500"/>
+      <unit id="org.mockito.source" version="1.8.4.v201303031500"/>
+      <unit id="com.google.gson" version="2.8.2.v20180104-1110"/>
+      <unit id="com.google.gson.source" version="2.8.2.v20180104-1110"/>
+      <unit id="com.jcraft.jsch" version="0.1.54.v20170116-1932"/>
+      <unit id="com.jcraft.jsch.source" version="0.1.54.v20170116-1932"/>
+      <unit id="org.junit" version="4.12.0.v201504281640"/>
+      <unit id="org.junit.source" version="4.12.0.v201504281640"/>
+      <unit id="javax.servlet" version="3.1.0.v201410161800"/>
+      <unit id="javax.servlet.source" version="3.1.0.v201410161800"/>
+      <unit id="org.tukaani.xz" version="1.6.0.v20170629-1752"/>
+      <unit id="org.tukaani.xz.source" version="1.6.0.v20170629-1752"/>
+      <unit id="org.slf4j.api" version="1.7.2.v20121108-1250"/>
+      <unit id="org.slf4j.api.source" version="1.7.2.v20121108-1250"/>
+      <unit id="org.slf4j.impl.log4j12" version="1.7.2.v20131105-2200"/>
+      <unit id="org.slf4j.impl.log4j12.source" version="1.7.2.v20131105-2200"/>
+      <unit id="com.jcraft.jzlib" version="1.1.1.v201205102305"/>
+      <unit id="com.jcraft.jzlib.source" version="1.1.1.v201205102305"/>
+      <repository location="http://download.eclipse.org/tools/orbit/downloads/drops/R20180905201904/repository"/>
+    </location>
+    <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
+      <unit id="org.eclipse.osgi" version="0.0.0"/>
+      <repository location="http://download.eclipse.org/staging/2018-09/"/>
+    </location>
+  </locations>
+</target>
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.9-staging.tpd b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.9-staging.tpd
new file mode 100644
index 0000000..6f963c7
--- /dev/null
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.9-staging.tpd
@@ -0,0 +1,8 @@
+target "jgit-4.9-staging" with source configurePhase
+
+include "projects/jetty-9.4.11.tpd"
+include "orbit/R20180905201904-2018-09.tpd"
+
+location "http://download.eclipse.org/staging/2018-09/" {
+	org.eclipse.osgi lazy
+}
\ No newline at end of file
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/orbit/R20180905201904-2018-09.tpd b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/orbit/R20180905201904-2018-09.tpd
new file mode 100644
index 0000000..eaae99c
--- /dev/null
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/orbit/R20180905201904-2018-09.tpd
@@ -0,0 +1,48 @@
+target "R20180905201904-2018-09" with source configurePhase
+// see http://download.eclipse.org/tools/orbit/downloads/
+
+location "http://download.eclipse.org/tools/orbit/downloads/drops/R20180905201904/repository" {
+	org.apache.ant [1.9.6.v201510161327,1.9.6.v201510161327]
+	org.apache.ant.source [1.9.6.v201510161327,1.9.6.v201510161327]
+	org.apache.commons.codec [1.10.0.v20180409-1845,1.10.0.v20180409-1845]
+	org.apache.commons.codec.source [1.10.0.v20180409-1845,1.10.0.v20180409-1845]
+	org.apache.commons.compress [1.15.0.v20180119-1613,1.15.0.v20180119-1613]
+	org.apache.commons.compress.source [1.15.0.v20180119-1613,1.15.0.v20180119-1613s]
+	org.apache.commons.logging [1.2.0.v20180409-1502,1.2.0.v20180409-1502]
+	org.apache.commons.logging.source [1.2.0.v20180409-1502,1.2.0.v20180409-1502]
+	org.apache.httpcomponents.httpclient [4.5.5.v20180409-1525,4.5.5.v20180409-1525]
+	org.apache.httpcomponents.httpclient.source [4.5.5.v20180409-1525,4.5.5.v20180409-1525]
+	org.apache.httpcomponents.httpcore [4.4.9.v20180409-1525,4.4.9.v20180409-1525]
+	org.apache.httpcomponents.httpcore.source [4.4.9.v20180409-1525,4.4.9.v20180409-1525]
+	org.apache.log4j [1.2.15.v201012070815,1.2.15.v201012070815]
+	org.apache.log4j.source [1.2.15.v201012070815,1.2.15.v201012070815]
+	org.kohsuke.args4j [2.33.0.v20160323-2218,2.33.0.v20160323-2218]
+	org.kohsuke.args4j.source [2.33.0.v20160323-2218,2.33.0.v20160323-2218]
+	org.hamcrest [1.1.0.v20090501071000,1.1.0.v20090501071000]
+	org.hamcrest.core [1.3.0.v20180420-1519,1.3.0.v20180420-1519]
+	org.hamcrest.core.source [1.3.0.v20180420-1519,1.3.0.v20180420-1519]
+	org.hamcrest.library [1.3.0.v20180524-2246,1.3.0.v20180524-2246]
+	org.hamcrest.library.source [1.3.0.v20180524-2246,1.3.0.v20180524-2246]
+	javaewah [1.1.6.v20160919-1400,1.1.6.v20160919-1400]
+	javaewah.source [1.1.6.v20160919-1400,1.1.6.v20160919-1400]
+	org.objenesis [1.0.0.v201505121915,1.0.0.v201505121915]
+	org.objenesis.source [1.0.0.v201505121915,1.0.0.v201505121915]
+	org.mockito [1.8.4.v201303031500,1.8.4.v201303031500]
+	org.mockito.source [1.8.4.v201303031500,1.8.4.v201303031500]
+	com.google.gson [2.8.2.v20180104-1110,2.8.2.v20180104-1110]
+	com.google.gson.source [2.8.2.v20180104-1110,2.8.2.v20180104-1110]
+	com.jcraft.jsch [0.1.54.v20170116-1932,0.1.54.v20170116-1932]
+	com.jcraft.jsch.source [0.1.54.v20170116-1932,0.1.54.v20170116-1932]
+	org.junit [4.12.0.v201504281640,4.12.0.v201504281640]
+	org.junit.source [4.12.0.v201504281640,4.12.0.v201504281640]
+	javax.servlet [3.1.0.v201410161800,3.1.0.v201410161800]
+	javax.servlet.source [3.1.0.v201410161800,3.1.0.v201410161800]
+	org.tukaani.xz [1.6.0.v20170629-1752,1.6.0.v20170629-1752]
+	org.tukaani.xz.source [1.6.0.v20170629-1752,1.6.0.v20170629-1752]
+	org.slf4j.api [1.7.2.v20121108-1250,1.7.2.v20121108-1250]
+	org.slf4j.api.source [1.7.2.v20121108-1250,1.7.2.v20121108-1250]
+	org.slf4j.impl.log4j12 [1.7.2.v20131105-2200,1.7.2.v20131105-2200]
+	org.slf4j.impl.log4j12.source [1.7.2.v20131105-2200,1.7.2.v20131105-2200]
+	com.jcraft.jzlib [1.1.1.v201205102305,1.1.1.v201205102305]
+	com.jcraft.jzlib.source [1.1.1.v201205102305,1.1.1.v201205102305]
+}
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/pom.xml b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/pom.xml
index 3c60a83..f46a74a 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/pom.xml
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/pom.xml
@@ -49,7 +49,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>jgit.tycho.parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <artifactId>org.eclipse.jgit.target</artifactId>
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/projects/jetty-9.4.11.tpd b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/projects/jetty-9.4.11.tpd
new file mode 100644
index 0000000..d2fd901
--- /dev/null
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/projects/jetty-9.4.11.tpd
@@ -0,0 +1,20 @@
+target "jetty-9.4.11" with source configurePhase
+
+location jetty-9.4.11 "http://download.eclipse.org/jetty/updates/jetty-bundles-9.x/9.4.11.v20180605" {
+	org.eclipse.jetty.client [9.4.11.v20180605,9.4.11.v20180605]
+	org.eclipse.jetty.client.source [9.4.11.v20180605,9.4.11.v20180605]
+	org.eclipse.jetty.continuation [9.4.11.v20180605,9.4.11.v20180605]
+	org.eclipse.jetty.continuation.source [9.4.11.v20180605,9.4.11.v20180605]
+	org.eclipse.jetty.http [9.4.11.v20180605,9.4.11.v20180605]
+	org.eclipse.jetty.http.source [9.4.11.v20180605,9.4.11.v20180605]
+	org.eclipse.jetty.io [9.4.11.v20180605,9.4.11.v20180605]
+	org.eclipse.jetty.io.source [9.4.11.v20180605,9.4.11.v20180605]
+	org.eclipse.jetty.security [9.4.11.v20180605,9.4.11.v20180605]
+	org.eclipse.jetty.security.source [9.4.11.v20180605,9.4.11.v20180605]
+	org.eclipse.jetty.server [9.4.11.v20180605,9.4.11.v20180605]
+	org.eclipse.jetty.server.source [9.4.11.v20180605,9.4.11.v20180605]
+	org.eclipse.jetty.servlet [9.4.11.v20180605,9.4.11.v20180605]
+	org.eclipse.jetty.servlet.source [9.4.11.v20180605,9.4.11.v20180605]
+	org.eclipse.jetty.util [9.4.11.v20180605,9.4.11.v20180605]
+	org.eclipse.jetty.util.source [9.4.11.v20180605,9.4.11.v20180605]
+}
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/projects/jetty-9.4.8.tpd b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/projects/jetty-9.4.8.tpd
deleted file mode 100644
index e37a062..0000000
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/projects/jetty-9.4.8.tpd
+++ /dev/null
@@ -1,20 +0,0 @@
-target "jetty-9.4.8" with source configurePhase
-
-location jetty-9.4.8 "http://download.eclipse.org/jetty/updates/jetty-bundles-9.x/9.4.8.v20171121" {
-	org.eclipse.jetty.client [9.4.8.v20171121,9.4.8.v20171121]
-	org.eclipse.jetty.client.source [9.4.8.v20171121,9.4.8.v20171121]
-	org.eclipse.jetty.continuation [9.4.8.v20171121,9.4.8.v20171121]
-	org.eclipse.jetty.continuation.source [9.4.8.v20171121,9.4.8.v20171121]
-	org.eclipse.jetty.http [9.4.8.v20171121,9.4.8.v20171121]
-	org.eclipse.jetty.http.source [9.4.8.v20171121,9.4.8.v20171121]
-	org.eclipse.jetty.io [9.4.8.v20171121,9.4.8.v20171121]
-	org.eclipse.jetty.io.source [9.4.8.v20171121,9.4.8.v20171121]
-	org.eclipse.jetty.security [9.4.8.v20171121,9.4.8.v20171121]
-	org.eclipse.jetty.security.source [9.4.8.v20171121,9.4.8.v20171121]
-	org.eclipse.jetty.server [9.4.8.v20171121,9.4.8.v20171121]
-	org.eclipse.jetty.server.source [9.4.8.v20171121,9.4.8.v20171121]
-	org.eclipse.jetty.servlet [9.4.8.v20171121,9.4.8.v20171121]
-	org.eclipse.jetty.servlet.source [9.4.8.v20171121,9.4.8.v20171121]
-	org.eclipse.jetty.util [9.4.8.v20171121,9.4.8.v20171121]
-	org.eclipse.jetty.util.source [9.4.8.v20171121,9.4.8.v20171121]
-}
diff --git a/org.eclipse.jgit.packaging/pom.xml b/org.eclipse.jgit.packaging/pom.xml
index 3cb21c1..f94ef6e 100644
--- a/org.eclipse.jgit.packaging/pom.xml
+++ b/org.eclipse.jgit.packaging/pom.xml
@@ -53,13 +53,13 @@
 
   <groupId>org.eclipse.jgit</groupId>
   <artifactId>jgit.tycho.parent</artifactId>
-  <version>5.0.4-SNAPSHOT</version>
+  <version>5.1.2-SNAPSHOT</version>
   <packaging>pom</packaging>
 
   <name>JGit Tycho Parent</name>
 
   <properties>
-    <tycho-version>1.1.0</tycho-version>
+    <tycho-version>1.2.0</tycho-version>
     <tycho-extras-version>${tycho-version}</tycho-extras-version>
     <target-platform>jgit-4.6</target-platform>
   </properties>
@@ -169,7 +169,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-resources-plugin</artifactId>
-          <version>3.0.2</version>
+          <version>3.1.0</version>
           <configuration>
             <encoding>ISO-8859-1</encoding>
           </configuration>
@@ -236,12 +236,12 @@
         <plugin>
           <groupId>org.eclipse.cbi.maven.plugins</groupId>
           <artifactId>eclipse-jarsigner-plugin</artifactId>
-          <version>1.1.4</version>
+          <version>1.1.5</version>
         </plugin>
         <plugin>
           <groupId>org.codehaus.mojo</groupId>
           <artifactId>build-helper-maven-plugin</artifactId>
-          <version>1.12</version>
+          <version>3.0.0</version>
         </plugin>
       </plugins>
     </pluginManagement>
diff --git a/org.eclipse.jgit.pgm.test/META-INF/MANIFEST.MF b/org.eclipse.jgit.pgm.test/META-INF/MANIFEST.MF
index 39910ce..426acbf 100644
--- a/org.eclipse.jgit.pgm.test/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.pgm.test/META-INF/MANIFEST.MF
@@ -3,28 +3,28 @@
 Bundle-Name: %plugin_name
 Automatic-Module-Name: org.eclipse.jgit.pgm.test
 Bundle-SymbolicName: org.eclipse.jgit.pgm.test
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
 Bundle-Vendor: %provider_name
 Bundle-Localization: plugin
 Bundle-ActivationPolicy: lazy
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
-Import-Package: org.eclipse.jgit.api;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.api.errors;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.diff;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.dircache;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.file;version="5.0.4",
- org.eclipse.jgit.junit;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.merge;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.pgm;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.pgm.internal;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.pgm.opt;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.revwalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.storage.file;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.treewalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util.io;version="[5.0.4,5.1.0)",
+Import-Package: org.eclipse.jgit.api;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.api.errors;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.diff;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.dircache;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.file;version="5.1.2",
+ org.eclipse.jgit.junit;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.merge;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.pgm;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.pgm.internal;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.pgm.opt;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.revwalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.storage.file;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.treewalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util.io;version="[5.1.2,5.2.0)",
  org.hamcrest.core;bundle-version="[1.1.0,2.0.0)",
  org.junit;version="[4.12,5.0.0)",
  org.junit.rules;version="[4.12,5.0.0)",
diff --git a/org.eclipse.jgit.pgm.test/pom.xml b/org.eclipse.jgit.pgm.test/pom.xml
index 30c32ed..0ab4c0a 100644
--- a/org.eclipse.jgit.pgm.test/pom.xml
+++ b/org.eclipse.jgit.pgm.test/pom.xml
@@ -50,7 +50,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>org.eclipse.jgit-parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <artifactId>org.eclipse.jgit.pgm.test</artifactId>
diff --git a/org.eclipse.jgit.pgm.test/src/org/eclipse/jgit/pgm/CLIGitCommand.java b/org.eclipse.jgit.pgm.test/src/org/eclipse/jgit/pgm/CLIGitCommand.java
index 44ad79d..81875f1 100644
--- a/org.eclipse.jgit.pgm.test/src/org/eclipse/jgit/pgm/CLIGitCommand.java
+++ b/org.eclipse.jgit.pgm.test/src/org/eclipse/jgit/pgm/CLIGitCommand.java
@@ -230,7 +230,7 @@
 		}
 		if (r.length() > 0)
 			list.add(r.toString());
-		return list.toArray(new String[list.size()]);
+		return list.toArray(new String[0]);
 	}
 
 	public static class Result {
diff --git a/org.eclipse.jgit.pgm.test/tst/org/eclipse/jgit/pgm/ArchiveTest.java b/org.eclipse.jgit.pgm.test/tst/org/eclipse/jgit/pgm/ArchiveTest.java
index afeb5ef..47eb156 100644
--- a/org.eclipse.jgit.pgm.test/tst/org/eclipse/jgit/pgm/ArchiveTest.java
+++ b/org.eclipse.jgit.pgm.test/tst/org/eclipse/jgit/pgm/ArchiveTest.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.pgm;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.fail;
@@ -544,7 +544,7 @@
 
 		byte[] result = CLIGitCommand.executeRaw(
 				"git archive --format=zip HEAD", db).outBytes();
-		assertArrayEquals(l.toArray(new String[l.size()]),
+		assertArrayEquals(l.toArray(new String[0]),
 				listZipEntries(result));
 	}
 
@@ -564,7 +564,7 @@
 
 		byte[] result = CLIGitCommand.executeRaw(
 				"git archive --format=tar HEAD", db).outBytes();
-		assertArrayEquals(l.toArray(new String[l.size()]),
+		assertArrayEquals(l.toArray(new String[0]),
 				listTarEntries(result));
 	}
 
@@ -612,7 +612,7 @@
 
 	private BufferedReader readFromProcess(Process proc) throws Exception {
 		return new BufferedReader(
-				new InputStreamReader(proc.getInputStream(), CHARSET));
+				new InputStreamReader(proc.getInputStream(), UTF_8));
 	}
 
 	private void grepForEntry(String name, String mode, String... cmdline)
@@ -697,7 +697,7 @@
 			while ((e = in.getNextEntry()) != null)
 				l.add(e.getName());
 		}
-		return l.toArray(new String[l.size()]);
+		return l.toArray(new String[0]);
 	}
 
 	private static Future<Object> writeAsync(OutputStream stream, byte[] data) {
@@ -730,7 +730,7 @@
 				while ((line = reader.readLine()) != null)
 					l.add(line);
 
-				return l.toArray(new String[l.size()]);
+				return l.toArray(new String[0]);
 			} finally {
 				writing.get();
 				proc.destroy();
@@ -750,11 +750,11 @@
 			// found!
 			List<String> l = new ArrayList<>();
 			BufferedReader reader = new BufferedReader(
-					new InputStreamReader(in, CHARSET));
+					new InputStreamReader(in, UTF_8));
 			String line;
 			while ((line = reader.readLine()) != null)
 				l.add(line);
-			return l.toArray(new String[l.size()]);
+			return l.toArray(new String[0]);
 		}
 
 		// not found
@@ -774,7 +774,7 @@
 				while ((line = reader.readLine()) != null)
 					l.add(line);
 
-				return l.toArray(new String[l.size()]);
+				return l.toArray(new String[0]);
 			} finally {
 				writing.get();
 				proc.destroy();
diff --git a/org.eclipse.jgit.pgm.test/tst/org/eclipse/jgit/pgm/LsFilesTest.java b/org.eclipse.jgit.pgm.test/tst/org/eclipse/jgit/pgm/LsFilesTest.java
new file mode 100644
index 0000000..d290206
--- /dev/null
+++ b/org.eclipse.jgit.pgm.test/tst/org/eclipse/jgit/pgm/LsFilesTest.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2017, Matthias Sohn <matthias.sohn@sap.com>
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.eclipse.jgit.pgm;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertTrue;
+
+import java.io.File;
+
+import org.eclipse.jgit.api.Git;
+import org.eclipse.jgit.junit.JGitTestUtil;
+import org.eclipse.jgit.lib.CLIRepositoryTestCase;
+import org.eclipse.jgit.util.FileUtils;
+import org.junit.Before;
+import org.junit.Test;
+
+public class LsFilesTest extends CLIRepositoryTestCase {
+
+	@Before
+	@Override
+	public void setUp() throws Exception {
+		super.setUp();
+		try (Git git = new Git(db)) {
+			JGitTestUtil.writeTrashFile(db, "hello", "hello");
+			JGitTestUtil.writeTrashFile(db, "dir", "world", "world");
+			git.add().addFilepattern("dir").call();
+			git.commit().setMessage("Initial commit").call();
+
+			JGitTestUtil.writeTrashFile(db, "hello2", "hello");
+			git.add().addFilepattern("hello2").call();
+			FileUtils.createSymLink(new File(db.getWorkTree(), "link"),
+					"target");
+			FileUtils.mkdir(new File(db.getWorkTree(), "target"));
+			writeTrashFile("target/file", "someData");
+			git.add().addFilepattern("target").addFilepattern("link").call();
+			git.commit().setMessage("hello2").call();
+
+			JGitTestUtil.writeTrashFile(db, "staged", "x");
+			JGitTestUtil.deleteTrashFile(db, "hello2");
+			git.add().addFilepattern("staged").call();
+			JGitTestUtil.writeTrashFile(db, "untracked", "untracked");
+		}
+	}
+
+	@Test
+	public void testHelp() throws Exception {
+		String[] result = execute("git ls-files -h");
+		assertTrue(result[1].startsWith("jgit ls-files"));
+	}
+
+	@Test
+	public void testLsFiles() throws Exception {
+		assertArrayEquals(new String[] { "dir/world", "hello2", "link",
+				"staged", "target/file", "" }, execute("git ls-files"));
+	}
+}
diff --git a/org.eclipse.jgit.pgm/META-INF/MANIFEST.MF b/org.eclipse.jgit.pgm/META-INF/MANIFEST.MF
index f8aa095..762d1e6 100644
--- a/org.eclipse.jgit.pgm/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.pgm/META-INF/MANIFEST.MF
@@ -3,7 +3,7 @@
 Bundle-Name: %plugin_name
 Automatic-Module-Name: org.eclipse.jgit.pgm
 Bundle-SymbolicName: org.eclipse.jgit.pgm
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
 Bundle-Vendor: %provider_name
 Bundle-ActivationPolicy: lazy
 Bundle-Localization: plugin
@@ -28,49 +28,49 @@
  org.eclipse.jetty.util.log;version="[9.4.5,10.0.0)",
  org.eclipse.jetty.util.security;version="[9.4.5,10.0.0)",
  org.eclipse.jetty.util.thread;version="[9.4.5,10.0.0)",
- org.eclipse.jgit.api;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.api.errors;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.archive;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.awtui;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.blame;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.diff;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.dircache;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.errors;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.gitrepo;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.ketch;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.dfs;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.file;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.io;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.pack;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.reftable;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.reftree;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs.server;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs.server.fs;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs.server.s3;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.merge;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.nls;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.notes;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.revplot;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.revwalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.revwalk.filter;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.storage.file;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.storage.pack;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport.http.apache;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport.resolver;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.treewalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.treewalk.filter;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util.io;version="[5.0.4,5.1.0)",
+ org.eclipse.jgit.api;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.api.errors;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.archive;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.awtui;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.blame;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.diff;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.dircache;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.errors;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.gitrepo;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.ketch;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.dfs;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.file;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.io;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.pack;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.reftable;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.reftree;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs.server;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs.server.fs;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs.server.s3;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.merge;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.nls;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.notes;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.revplot;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.revwalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.revwalk.filter;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.storage.file;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.storage.pack;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport.http.apache;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport.resolver;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.treewalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.treewalk.filter;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util.io;version="[5.1.2,5.2.0)",
  org.kohsuke.args4j;version="[2.33.0,3.0.0)",
  org.kohsuke.args4j.spi;version="[2.33.0,3.0.0)"
-Export-Package: org.eclipse.jgit.console;version="5.0.4";
+Export-Package: org.eclipse.jgit.console;version="5.1.2";
   uses:="org.eclipse.jgit.transport,
    org.eclipse.jgit.util",
- org.eclipse.jgit.pgm;version="5.0.4";
+ org.eclipse.jgit.pgm;version="5.1.2";
   uses:="org.eclipse.jgit.revwalk,
    org.eclipse.jgit.treewalk.filter,
    org.eclipse.jgit.pgm.opt,
@@ -81,11 +81,11 @@
    org.eclipse.jgit.treewalk,
    javax.swing,
    org.eclipse.jgit.transport",
- org.eclipse.jgit.pgm.debug;version="5.0.4";
+ org.eclipse.jgit.pgm.debug;version="5.1.2";
   uses:="org.eclipse.jgit.util.io,
    org.eclipse.jgit.pgm",
- org.eclipse.jgit.pgm.internal;version="5.0.4";x-friends:="org.eclipse.jgit.pgm.test,org.eclipse.jgit.test",
- org.eclipse.jgit.pgm.opt;version="5.0.4";
+ org.eclipse.jgit.pgm.internal;version="5.1.2";x-friends:="org.eclipse.jgit.pgm.test,org.eclipse.jgit.test",
+ org.eclipse.jgit.pgm.opt;version="5.1.2";
   uses:="org.eclipse.jgit.lib,
    org.eclipse.jgit.revwalk,
    org.kohsuke.args4j.spi,
diff --git a/org.eclipse.jgit.pgm/META-INF/SOURCE-MANIFEST.MF b/org.eclipse.jgit.pgm/META-INF/SOURCE-MANIFEST.MF
index 1d4575e..f05ae55 100644
--- a/org.eclipse.jgit.pgm/META-INF/SOURCE-MANIFEST.MF
+++ b/org.eclipse.jgit.pgm/META-INF/SOURCE-MANIFEST.MF
@@ -3,5 +3,5 @@
 Bundle-Name: org.eclipse.jgit.pgm - Sources
 Bundle-SymbolicName: org.eclipse.jgit.pgm.source
 Bundle-Vendor: Eclipse.org - JGit
-Bundle-Version: 5.0.4.qualifier
-Eclipse-SourceBundle: org.eclipse.jgit.pgm;version="5.0.4.qualifier";roots="."
+Bundle-Version: 5.1.2.qualifier
+Eclipse-SourceBundle: org.eclipse.jgit.pgm;version="5.1.2.qualifier";roots="."
diff --git a/org.eclipse.jgit.pgm/META-INF/services/org.eclipse.jgit.pgm.TextBuiltin b/org.eclipse.jgit.pgm/META-INF/services/org.eclipse.jgit.pgm.TextBuiltin
index 9025473..39fbe2e 100644
--- a/org.eclipse.jgit.pgm/META-INF/services/org.eclipse.jgit.pgm.TextBuiltin
+++ b/org.eclipse.jgit.pgm/META-INF/services/org.eclipse.jgit.pgm.TextBuiltin
@@ -18,6 +18,7 @@
 org.eclipse.jgit.pgm.IndexPack
 org.eclipse.jgit.pgm.Init
 org.eclipse.jgit.pgm.Log
+org.eclipse.jgit.pgm.LsFiles
 org.eclipse.jgit.pgm.LsRemote
 org.eclipse.jgit.pgm.LsTree
 org.eclipse.jgit.pgm.Merge
diff --git a/org.eclipse.jgit.pgm/pom.xml b/org.eclipse.jgit.pgm/pom.xml
index db6745e..45a87ed 100644
--- a/org.eclipse.jgit.pgm/pom.xml
+++ b/org.eclipse.jgit.pgm/pom.xml
@@ -50,7 +50,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>org.eclipse.jgit-parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <artifactId>org.eclipse.jgit.pgm</artifactId>
@@ -108,19 +108,16 @@
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-api</artifactId>
-      <version>${slf4j-version}</version>
     </dependency>
 
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-log4j12</artifactId>
-      <version>${slf4j-version}</version>
     </dependency>
 
     <dependency>
       <groupId>log4j</groupId>
       <artifactId>log4j</artifactId>
-      <version>${log4j-version}</version>
     </dependency>
 
     <dependency>
diff --git a/org.eclipse.jgit.pgm/resources/org/eclipse/jgit/pgm/internal/CLIText.properties b/org.eclipse.jgit.pgm/resources/org/eclipse/jgit/pgm/internal/CLIText.properties
index e937093..8ff9c6b 100644
--- a/org.eclipse.jgit.pgm/resources/org/eclipse/jgit/pgm/internal/CLIText.properties
+++ b/org.eclipse.jgit.pgm/resources/org/eclipse/jgit/pgm/internal/CLIText.properties
@@ -245,6 +245,7 @@
 usage_LFSRunStore=Store (fs | s3), store lfs objects in file system or Amazon S3
 usage_LFSStoreUrl=URL of the LFS store
 usage_LongFormat=Always output the long format
+usage_LsFiles=Show information about files in the index and the working tree
 usage_LsRemote=List references in a remote repository
 usage_lsRemoteHeads=Show only refs starting with refs/heads
 usage_lsRemoteTags=Show only refs starting with refs/tags
diff --git a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/CommandCatalog.java b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/CommandCatalog.java
index 5754d7c..dbdccc1 100644
--- a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/CommandCatalog.java
+++ b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/CommandCatalog.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.pgm;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.BufferedReader;
 import java.io.IOException;
@@ -114,7 +114,7 @@
 	}
 
 	private static CommandRef[] toSortedArray(Collection<CommandRef> c) {
-		final CommandRef[] r = c.toArray(new CommandRef[c.size()]);
+		final CommandRef[] r = c.toArray(new CommandRef[0]);
 		Arrays.sort(r, new Comparator<CommandRef>() {
 			@Override
 			public int compare(CommandRef o1, CommandRef o2) {
@@ -148,7 +148,7 @@
 
 	private void scan(URL cUrl) {
 		try (BufferedReader cIn = new BufferedReader(
-				new InputStreamReader(cUrl.openStream(), CHARSET))) {
+				new InputStreamReader(cUrl.openStream(), UTF_8))) {
 			String line;
 			while ((line = cIn.readLine()) != null) {
 				if (line.length() > 0 && !line.startsWith("#")) //$NON-NLS-1$
diff --git a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Describe.java b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Describe.java
index f9c1cf5..f914748 100644
--- a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Describe.java
+++ b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Describe.java
@@ -73,7 +73,7 @@
 			if (tree != null)
 				cmd.setTarget(tree);
 			cmd.setLong(longDesc);
-			cmd.setMatch(patterns.toArray(new String[patterns.size()]));
+			cmd.setMatch(patterns.toArray(new String[0]));
 			String result = null;
 			try {
 				result = cmd.call();
diff --git a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/LsFiles.java b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/LsFiles.java
new file mode 100644
index 0000000..dc13000
--- /dev/null
+++ b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/LsFiles.java
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2017, Matthias Sohn <matthias.sohn@sap.com>
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.eclipse.jgit.pgm;
+
+import static java.util.function.Predicate.isEqual;
+import static org.eclipse.jgit.lib.FileMode.EXECUTABLE_FILE;
+import static org.eclipse.jgit.lib.FileMode.GITLINK;
+import static org.eclipse.jgit.lib.FileMode.REGULAR_FILE;
+import static org.eclipse.jgit.lib.FileMode.SYMLINK;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.eclipse.jgit.dircache.DirCacheIterator;
+import org.eclipse.jgit.lib.Constants;
+import org.eclipse.jgit.lib.FileMode;
+import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.revwalk.RevCommit;
+import org.eclipse.jgit.revwalk.RevWalk;
+import org.eclipse.jgit.treewalk.CanonicalTreeParser;
+import org.eclipse.jgit.treewalk.TreeWalk;
+import org.eclipse.jgit.treewalk.filter.PathFilterGroup;
+import org.eclipse.jgit.util.QuotedString;
+import org.kohsuke.args4j.Option;
+import org.kohsuke.args4j.spi.StopOptionHandler;
+
+@Command(common = true, usage = "usage_LsFiles")
+class LsFiles extends TextBuiltin {
+
+	@Option(name = "--", metaVar = "metaVar_paths", handler = StopOptionHandler.class)
+	private List<String> paths = new ArrayList<>();
+
+	@Override
+	protected void run() throws Exception {
+		try (RevWalk rw = new RevWalk(db);
+				TreeWalk tw = new TreeWalk(db)) {
+			final ObjectId head = db.resolve(Constants.HEAD);
+			if (head == null) {
+				return;
+			}
+			RevCommit c = rw.parseCommit(head);
+			CanonicalTreeParser p = new CanonicalTreeParser();
+			p.reset(rw.getObjectReader(), c.getTree());
+			tw.reset(); // drop the first empty tree, which we do not need here
+			if (paths.size() > 0) {
+				tw.setFilter(PathFilterGroup.createFromStrings(paths));
+			}
+			tw.addTree(p);
+			tw.addTree(new DirCacheIterator(db.readDirCache()));
+			tw.setRecursive(true);
+			while (tw.next()) {
+				if (filterFileMode(tw, EXECUTABLE_FILE, GITLINK, REGULAR_FILE,
+						SYMLINK)) {
+					outw.println(
+							QuotedString.GIT_PATH.quote(tw.getPathString()));
+				}
+			}
+		}
+	}
+
+	private boolean filterFileMode(TreeWalk tw, FileMode... modes) {
+		return Arrays.stream(modes).anyMatch(isEqual(tw.getFileMode(0))
+				.or(isEqual(tw.getFileMode(1))));
+	}
+}
diff --git a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Main.java b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Main.java
index ac53de9..ad10ec9 100644
--- a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Main.java
+++ b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Main.java
@@ -44,7 +44,7 @@
 
 package org.eclipse.jgit.pgm;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.File;
 import java.io.IOException;
@@ -71,7 +71,6 @@
 import org.eclipse.jgit.pgm.internal.CLIText;
 import org.eclipse.jgit.pgm.opt.CmdLineParser;
 import org.eclipse.jgit.pgm.opt.SubcommandHandler;
-import org.eclipse.jgit.storage.file.WindowCacheConfig;
 import org.eclipse.jgit.transport.HttpTransport;
 import org.eclipse.jgit.transport.http.apache.HttpClientConnectionFactory;
 import org.eclipse.jgit.util.CachedAuthenticator;
@@ -106,19 +105,10 @@
 
 	private ExecutorService gcExecutor;
 
-	private static final int MB = 1024 * 1024;
-
 	/**
 	 * <p>Constructor for Main.</p>
 	 */
 	public Main() {
-		final WindowCacheConfig c = new WindowCacheConfig();
-		c.setPackedGitMMAP(true);
-		c.setPackedGitWindowSize(8 * 1024);
-		c.setPackedGitLimit(10 * MB);
-		c.setDeltaBaseCacheLimit(10 * MB);
-		c.setStreamFileThreshold(50 * MB);
-		c.install();
 		HttpTransport.setConnectionFactory(new HttpClientConnectionFactory());
 		BuiltinLFS.register();
 		gcExecutor = Executors.newSingleThreadExecutor(new ThreadFactory() {
@@ -227,7 +217,7 @@
 	}
 
 	PrintWriter createErrorWriter() {
-		return new PrintWriter(new OutputStreamWriter(System.err, CHARSET));
+		return new PrintWriter(new OutputStreamWriter(System.err, UTF_8));
 	}
 
 	private void execute(String[] argv) throws Exception {
@@ -285,7 +275,7 @@
 		final TextBuiltin cmd = subcommand;
 		init(cmd);
 		try {
-			cmd.execute(arguments.toArray(new String[arguments.size()]));
+			cmd.execute(arguments.toArray(new String[0]));
 		} finally {
 			if (cmd.outw != null) {
 				cmd.outw.flush();
diff --git a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Remote.java b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Remote.java
index 3308e18..63eba15 100644
--- a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Remote.java
+++ b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Remote.java
@@ -130,7 +130,7 @@
 					fetchArgs.add(name);
 				}
 
-				fetch.execute(fetchArgs.toArray(new String[fetchArgs.size()]));
+				fetch.execute(fetchArgs.toArray(new String[0]));
 
 				// flush the streams
 				fetch.outw.flush();
diff --git a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/BenchmarkReftable.java b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/BenchmarkReftable.java
index 575a122..248eaac 100644
--- a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/BenchmarkReftable.java
+++ b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/BenchmarkReftable.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.pgm.debug;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.lib.Constants.HEAD;
 import static org.eclipse.jgit.lib.Constants.MASTER;
 import static org.eclipse.jgit.lib.Constants.R_HEADS;
@@ -154,7 +154,7 @@
 			throws IOException, FileNotFoundException {
 		RefList.Builder<Ref> list = new RefList.Builder<>();
 		try (BufferedReader br = new BufferedReader(new InputStreamReader(
-				new FileInputStream(lsRemotePath), CHARSET))) {
+				new FileInputStream(lsRemotePath), UTF_8))) {
 			Ref last = null;
 			String line;
 			while ((line = br.readLine()) != null) {
diff --git a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/ReadReftable.java b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/ReadReftable.java
index fda1901..0b36e9c 100644
--- a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/ReadReftable.java
+++ b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/ReadReftable.java
@@ -70,7 +70,7 @@
 				BlockSource src = BlockSource.from(in);
 				ReftableReader reader = new ReftableReader(src)) {
 			try (RefCursor rc = ref != null
-					? reader.seekRef(ref)
+					? reader.seekRefsWithPrefix(ref)
 					: reader.allRefs()) {
 				while (rc.next()) {
 					write(rc.getRef());
diff --git a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/RebuildCommitGraph.java b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/RebuildCommitGraph.java
index 2d16fef..8948c27 100644
--- a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/RebuildCommitGraph.java
+++ b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/RebuildCommitGraph.java
@@ -43,6 +43,8 @@
 
 package org.eclipse.jgit.pgm.debug;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileInputStream;
@@ -141,7 +143,7 @@
 		try (RevWalk rw = new RevWalk(db);
 				final BufferedReader br = new BufferedReader(
 						new InputStreamReader(new FileInputStream(graph),
-								Constants.CHARSET))) {
+								UTF_8))) {
 			String line;
 			while ((line = br.readLine()) != null) {
 				final String[] parts = line.split("[ \t]{1,}"); //$NON-NLS-1$
@@ -280,7 +282,7 @@
 		try (RevWalk rw = new RevWalk(db);
 				BufferedReader br = new BufferedReader(
 						new InputStreamReader(new FileInputStream(refList),
-								Constants.CHARSET))) {
+								UTF_8))) {
 			String line;
 			while ((line = br.readLine()) != null) {
 				final String[] parts = line.split("[ \t]{1,}"); //$NON-NLS-1$
diff --git a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/WriteReftable.java b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/WriteReftable.java
index c5ea028..6cbc1b0 100644
--- a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/WriteReftable.java
+++ b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/debug/WriteReftable.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.pgm.debug;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.lib.Constants.HEAD;
 import static org.eclipse.jgit.lib.Constants.MASTER;
 import static org.eclipse.jgit.lib.Constants.R_HEADS;
@@ -192,7 +192,7 @@
 	static List<Ref> readRefs(String inputFile) throws IOException {
 		List<Ref> refs = new ArrayList<>();
 		try (BufferedReader br = new BufferedReader(
-				new InputStreamReader(new FileInputStream(inputFile), CHARSET))) {
+				new InputStreamReader(new FileInputStream(inputFile), UTF_8))) {
 			String line;
 			while ((line = br.readLine()) != null) {
 				ObjectId id = ObjectId.fromString(line.substring(0, 40));
@@ -227,7 +227,7 @@
 
 		List<LogEntry> log = new ArrayList<>();
 		try (BufferedReader br = new BufferedReader(
-				new InputStreamReader(new FileInputStream(logPath), CHARSET))) {
+				new InputStreamReader(new FileInputStream(logPath), UTF_8))) {
 			@SuppressWarnings("nls")
 			Pattern pattern = Pattern.compile("([^,]+)" // 1: ref
 					+ ",([0-9]+(?:[.][0-9]+)?)" // 2: time
diff --git a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/opt/CmdLineParser.java b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/opt/CmdLineParser.java
index 5cc98ca..b97aa5b 100644
--- a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/opt/CmdLineParser.java
+++ b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/opt/CmdLineParser.java
@@ -177,7 +177,7 @@
 		}
 
 		try {
-			super.parseArgument(tmp.toArray(new String[tmp.size()]));
+			super.parseArgument(tmp.toArray(new String[0]));
 		} catch (Die e) {
 			if (!seenHelp) {
 				throw e;
diff --git a/org.eclipse.jgit.test/META-INF/MANIFEST.MF b/org.eclipse.jgit.test/META-INF/MANIFEST.MF
index 4b83fb0..93e5ef5 100644
--- a/org.eclipse.jgit.test/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.test/META-INF/MANIFEST.MF
@@ -3,58 +3,58 @@
 Bundle-Name: %plugin_name
 Automatic-Module-Name: org.eclipse.jgit.test
 Bundle-SymbolicName: org.eclipse.jgit.test
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
 Bundle-Localization: plugin
 Bundle-Vendor: %provider_name
 Bundle-ActivationPolicy: lazy
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
 Import-Package: com.googlecode.javaewah;version="[1.1.6,2.0.0)",
  com.jcraft.jsch;version="[0.1.54,0.2.0)",
- org.eclipse.jgit.api;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.api.errors;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.attributes;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.awtui;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.blame;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.diff;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.dircache;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.errors;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.events;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.fnmatch;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.gitrepo;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.hooks;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.ignore;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.ignore.internal;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.fsck;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.dfs;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.file;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.io;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.pack;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.reftable;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.internal.storage.reftree;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.junit;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lfs;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.merge;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.nls;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.notes;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.patch;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.pgm;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.pgm.internal;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.revplot;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.revwalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.revwalk.filter;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.storage.file;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.storage.pack;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.submodule;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport.http;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport.resolver;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.treewalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.treewalk.filter;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util.io;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util.sha1;version="[5.0.4,5.1.0)",
+ org.eclipse.jgit.api;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.api.errors;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.attributes;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.awtui;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.blame;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.diff;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.dircache;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.errors;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.events;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.fnmatch;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.gitrepo;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.hooks;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.ignore;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.ignore.internal;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.fsck;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.dfs;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.file;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.io;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.pack;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.reftable;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.internal.storage.reftree;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.junit;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lfs;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.merge;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.nls;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.notes;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.patch;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.pgm;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.pgm.internal;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.revplot;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.revwalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.revwalk.filter;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.storage.file;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.storage.pack;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.submodule;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport.http;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport.resolver;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.treewalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.treewalk.filter;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util.io;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util.sha1;version="[5.1.2,5.2.0)",
  org.junit;version="[4.12,5.0.0)",
  org.junit.experimental.theories;version="[4.12,5.0.0)",
  org.junit.rules;version="[4.12,5.0.0)",
diff --git a/org.eclipse.jgit.test/exttst/org/eclipse/jgit/ignore/CGitVsJGitRandomIgnorePatternTest.java b/org.eclipse.jgit.test/exttst/org/eclipse/jgit/ignore/CGitVsJGitRandomIgnorePatternTest.java
index 4d9e864..438d2d6 100644
--- a/org.eclipse.jgit.test/exttst/org/eclipse/jgit/ignore/CGitVsJGitRandomIgnorePatternTest.java
+++ b/org.eclipse.jgit.test/exttst/org/eclipse/jgit/ignore/CGitVsJGitRandomIgnorePatternTest.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.ignore;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.BufferedReader;
 import java.io.File;
@@ -158,7 +158,7 @@
 			this.gitDir = gitDir;
 			this.pattern = pattern;
 			Files.write(FileUtils.toPath(new File(gitDir, ".gitignore")),
-					(pattern + "\n").getBytes(CHARSET), StandardOpenOption.CREATE,
+					(pattern + "\n").getBytes(UTF_8), StandardOpenOption.CREATE,
 					StandardOpenOption.TRUNCATE_EXISTING,
 					StandardOpenOption.WRITE);
 		}
@@ -188,7 +188,7 @@
 			Process proc = Runtime.getRuntime().exec(command, new String[0],
 					gitDir);
 			try (OutputStream out = proc.getOutputStream()) {
-				out.write((path + "\n").getBytes(CHARSET));
+				out.write((path + "\n").getBytes(UTF_8));
 				out.flush();
 			}
 			return proc;
diff --git a/org.eclipse.jgit.test/exttst/org/eclipse/jgit/patch/EGitPatchHistoryTest.java b/org.eclipse.jgit.test/exttst/org/eclipse/jgit/patch/EGitPatchHistoryTest.java
index 79d8d0e..f597f2f 100644
--- a/org.eclipse.jgit.test/exttst/org/eclipse/jgit/patch/EGitPatchHistoryTest.java
+++ b/org.eclipse.jgit.test/exttst/org/eclipse/jgit/patch/EGitPatchHistoryTest.java
@@ -44,6 +44,7 @@
 package org.eclipse.jgit.patch;
 
 import static java.nio.charset.StandardCharsets.ISO_8859_1;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
@@ -56,7 +57,6 @@
 import java.util.HashMap;
 import java.util.HashSet;
 
-import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.util.MutableInteger;
 import org.eclipse.jgit.util.RawParseUtils;
 import org.eclipse.jgit.util.TemporaryBuffer;
@@ -176,7 +176,7 @@
 				i.added = RawParseUtils.parseBase10(buf, ptr.value, ptr);
 				i.deleted = RawParseUtils.parseBase10(buf, ptr.value + 1, ptr);
 				final int eol = RawParseUtils.nextLF(buf, ptr.value);
-				final String name = RawParseUtils.decode(Constants.CHARSET,
+				final String name = RawParseUtils.decode(UTF_8,
 						buf, ptr.value + 1, eol - 1);
 				files.put(name, i);
 				ptr.value = eol;
diff --git a/org.eclipse.jgit.test/pom.xml b/org.eclipse.jgit.test/pom.xml
index e6c7128..bd27e4b 100644
--- a/org.eclipse.jgit.test/pom.xml
+++ b/org.eclipse.jgit.test/pom.xml
@@ -52,7 +52,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>org.eclipse.jgit-parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <artifactId>org.eclipse.jgit.test</artifactId>
@@ -157,7 +157,7 @@
       <plugin>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
-          <argLine>-Xmx256m -Dfile.encoding=UTF-8 -Djava.io.tmpdir=${project.build.directory}</argLine>
+          <argLine>-Xmx1024m -Dfile.encoding=UTF-8 -Djava.io.tmpdir=${project.build.directory}</argLine>
           <includes>
             <include>**/*Test.java</include>
             <include>**/*Tests.java</include>
diff --git a/org.eclipse.jgit.test/src/org/eclipse/jgit/events/ChangeRecorder.java b/org.eclipse.jgit.test/src/org/eclipse/jgit/events/ChangeRecorder.java
index c5582a8..228df35 100644
--- a/org.eclipse.jgit.test/src/org/eclipse/jgit/events/ChangeRecorder.java
+++ b/org.eclipse.jgit.test/src/org/eclipse/jgit/events/ChangeRecorder.java
@@ -74,11 +74,11 @@
 	}
 
 	private String[] getModified() {
-		return modified.toArray(new String[modified.size()]);
+		return modified.toArray(new String[0]);
 	}
 
 	private String[] getDeleted() {
-		return deleted.toArray(new String[deleted.size()]);
+		return deleted.toArray(new String[0]);
 	}
 
 	private void reset() {
diff --git a/org.eclipse.jgit.test/tests.bzl b/org.eclipse.jgit.test/tests.bzl
index f368000..bc06e3e 100644
--- a/org.eclipse.jgit.test/tests.bzl
+++ b/org.eclipse.jgit.test/tests.bzl
@@ -42,6 +42,10 @@
                 "//lib:jsch",
             ]
 
+        heap_size = "-Xmx256m"
+        if src.endswith("HugeCommitMessageTest.java"):
+            heap_size = "-Xmx512m"
+
         junit_tests(
             name = name,
             tags = labels,
@@ -57,5 +61,5 @@
                 "//org.eclipse.jgit.lfs:jgit-lfs",
             ],
             flaky = flaky,
-            jvm_flags = ["-Xmx256m", "-Dfile.encoding=UTF-8"],
+            jvm_flags = [heap_size, "-Dfile.encoding=UTF-8"],
         )
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/EolStreamTypeUtilTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/EolStreamTypeUtilTest.java
index bb303cc..1e3a39a 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/EolStreamTypeUtilTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/EolStreamTypeUtilTest.java
@@ -42,7 +42,7 @@
 
 package org.eclipse.jgit.api;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.lib.CoreConfig.EolStreamType.AUTO_CRLF;
 import static org.eclipse.jgit.lib.CoreConfig.EolStreamType.AUTO_LF;
 import static org.eclipse.jgit.lib.CoreConfig.EolStreamType.DIRECT;
@@ -150,8 +150,8 @@
 			EolStreamType streamTypeWithBinaryCheck, String output,
 			String expectedConversion) throws Exception {
 		ByteArrayOutputStream b;
-		byte[] outputBytes = output.getBytes(CHARSET);
-		byte[] expectedConversionBytes = expectedConversion.getBytes(CHARSET);
+		byte[] outputBytes = output.getBytes(UTF_8);
+		byte[] expectedConversionBytes = expectedConversion.getBytes(UTF_8);
 
 		// test using output text and assuming it was declared TEXT
 		b = new ByteArrayOutputStream();
@@ -277,8 +277,8 @@
 	private void testCheckin(EolStreamType streamTypeText,
 			EolStreamType streamTypeWithBinaryCheck, String input,
 			String expectedConversion) throws Exception {
-		byte[] inputBytes = input.getBytes(CHARSET);
-		byte[] expectedConversionBytes = expectedConversion.getBytes(CHARSET);
+		byte[] inputBytes = input.getBytes(UTF_8);
+		byte[] expectedConversionBytes = expectedConversion.getBytes(UTF_8);
 
 		// test using input text and assuming it was declared TEXT
 		try (InputStream in = EolStreamTypeUtil.wrapInputStream(
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/NotesCommandTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/NotesCommandTest.java
index e234aa3..6e06e95 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/NotesCommandTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/NotesCommandTest.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.api;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 
 import java.util.List;
@@ -88,7 +88,7 @@
 		git.notesAdd().setObjectId(commit2).setMessage("data").call();
 		Note note = git.notesShow().setObjectId(commit2).call();
 		String content = new String(db.open(note.getData()).getCachedBytes(),
-				CHARSET);
+				UTF_8);
 		assertEquals(content, "data");
 
 		git.notesRemove().setObjectId(commit2).call();
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/PullCommandTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/PullCommandTest.java
index 0b0e3bf..9461c42 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/PullCommandTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/PullCommandTest.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.api;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
@@ -592,7 +592,7 @@
 	private static void writeToFile(File actFile, String string)
 			throws IOException {
 		try (FileOutputStream fos = new FileOutputStream(actFile)) {
-			fos.write(string.getBytes(CHARSET));
+			fos.write(string.getBytes(UTF_8));
 		}
 	}
 
@@ -606,7 +606,7 @@
 				bos.write(buffer, 0, read);
 				read = fis.read(buffer);
 			}
-			String content = new String(bos.toByteArray(), CHARSET);
+			String content = new String(bos.toByteArray(), UTF_8);
 			assertEquals(string, content);
 		}
 	}
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/PullCommandWithRebaseTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/PullCommandWithRebaseTest.java
index b349c66..913b4ac 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/PullCommandWithRebaseTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/PullCommandWithRebaseTest.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.api;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
@@ -396,7 +396,7 @@
 	private static void writeToFile(File actFile, String string)
 			throws IOException {
 		try (FileOutputStream fos = new FileOutputStream(actFile)) {
-			fos.write(string.getBytes(CHARSET));
+			fos.write(string.getBytes(UTF_8));
 		}
 	}
 
@@ -410,7 +410,7 @@
 				bos.write(buffer, 0, read);
 				read = fis.read(buffer);
 			}
-			String content = new String(bos.toByteArray(), CHARSET);
+			String content = new String(bos.toByteArray(), UTF_8);
 			assertEquals(string, content);
 		}
 	}
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/PushCommandTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/PushCommandTest.java
index 1af37e2..ca86d81 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/PushCommandTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/PushCommandTest.java
@@ -245,7 +245,7 @@
 				git.add().addFilepattern("f" + i).call();
 				commit = git.commit().setMessage("adding f" + i).call();
 				git.push().setRemote("test").call();
-				git2.getRepository().getAllRefs();
+				git2.getRepository().getRefDatabase().getRefs();
 				assertEquals("failed to update on attempt " + i, commit.getId(),
 						git2.getRepository().resolve("refs/heads/test"));
 			}
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/RebaseCommandTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/RebaseCommandTest.java
index 96e7091..4401bce 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/RebaseCommandTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/RebaseCommandTest.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.api;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.hamcrest.CoreMatchers.equalTo;
 import static org.hamcrest.CoreMatchers.not;
 import static org.hamcrest.MatcherAssert.assertThat;
@@ -57,9 +57,12 @@
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
+import java.util.ArrayList;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
+import java.util.Set;
 
 import org.eclipse.jgit.api.MergeResult.MergeStatus;
 import org.eclipse.jgit.api.RebaseCommand.InteractiveHandler;
@@ -75,6 +78,7 @@
 import org.eclipse.jgit.errors.IllegalTodoFileModification;
 import org.eclipse.jgit.errors.IncorrectObjectTypeException;
 import org.eclipse.jgit.errors.MissingObjectException;
+import org.eclipse.jgit.events.ListenerHandle;
 import org.eclipse.jgit.junit.RepositoryTestCase;
 import org.eclipse.jgit.lib.AbbreviatedObjectId;
 import org.eclipse.jgit.lib.ConfigConstants;
@@ -1464,7 +1468,7 @@
 		assertEquals("GIT_AUTHOR_DATE='@123456789 -0100'", lines[2]);
 
 		PersonIdent parsedIdent = git.rebase().parseAuthor(
-				convertedAuthor.getBytes(CHARSET));
+				convertedAuthor.getBytes(UTF_8));
 		assertEquals(ident.getName(), parsedIdent.getName());
 		assertEquals(ident.getEmailAddress(), parsedIdent.getEmailAddress());
 		// this is rounded to the last second
@@ -1481,7 +1485,7 @@
 		assertEquals("GIT_AUTHOR_DATE='@123456789 +0930'", lines[2]);
 
 		parsedIdent = git.rebase().parseAuthor(
-				convertedAuthor.getBytes(CHARSET));
+				convertedAuthor.getBytes(UTF_8));
 		assertEquals(ident.getName(), parsedIdent.getName());
 		assertEquals(ident.getEmailAddress(), parsedIdent.getEmailAddress());
 		assertEquals(123456789000L, parsedIdent.getWhen().getTime());
@@ -1981,6 +1985,62 @@
 	}
 
 	@Test
+	public void testRebaseWithAutoStashAndSubdirs() throws Exception {
+		// create file0, add and commit
+		db.getConfig().setBoolean(ConfigConstants.CONFIG_REBASE_SECTION, null,
+				ConfigConstants.CONFIG_KEY_AUTOSTASH, true);
+		writeTrashFile("sub/file0", "file0");
+		git.add().addFilepattern("sub/file0").call();
+		git.commit().setMessage("commit0").call();
+		// create file1, add and commit
+		writeTrashFile(FILE1, "file1");
+		git.add().addFilepattern(FILE1).call();
+		RevCommit commit = git.commit().setMessage("commit1").call();
+
+		// create topic branch and checkout / create file2, add and commit
+		createBranch(commit, "refs/heads/topic");
+		checkoutBranch("refs/heads/topic");
+		writeTrashFile("file2", "file2");
+		git.add().addFilepattern("file2").call();
+		git.commit().setMessage("commit2").call();
+
+		// checkout master branch / modify file1, add and commit
+		checkoutBranch("refs/heads/master");
+		writeTrashFile(FILE1, "modified file1");
+		git.add().addFilepattern(FILE1).call();
+		git.commit().setMessage("commit3").call();
+
+		// checkout topic branch / modify file0
+		checkoutBranch("refs/heads/topic");
+		writeTrashFile("sub/file0", "unstaged modified file0");
+
+		Set<String> modifiedFiles = new HashSet<>();
+		ListenerHandle handle = db.getListenerList()
+				.addWorkingTreeModifiedListener(
+						event -> modifiedFiles.addAll(event.getModified()));
+		try {
+			// rebase
+			assertEquals(Status.OK, git.rebase()
+					.setUpstream("refs/heads/master").call().getStatus());
+		} finally {
+			handle.remove();
+		}
+		checkFile(new File(new File(db.getWorkTree(), "sub"), "file0"),
+				"unstaged modified file0");
+		checkFile(new File(db.getWorkTree(), FILE1), "modified file1");
+		checkFile(new File(db.getWorkTree(), "file2"), "file2");
+		assertEquals(
+				"[file1, mode:100644, content:modified file1]"
+						+ "[file2, mode:100644, content:file2]"
+						+ "[sub/file0, mode:100644, content:file0]",
+				indexState(CONTENT));
+		assertEquals(RepositoryState.SAFE, db.getRepositoryState());
+		List<String> modified = new ArrayList<>(modifiedFiles);
+		Collections.sort(modified);
+		assertEquals("[file1, sub/file0]", modified.toString());
+	}
+
+	@Test
 	public void testRebaseWithAutoStashConflictOnApply() throws Exception {
 		// create file0, add and commit
 		db.getConfig().setBoolean(ConfigConstants.CONFIG_REBASE_SECTION, null,
@@ -2104,7 +2164,7 @@
 		int count = 0;
 		File todoFile = getTodoFile();
 		try (BufferedReader br = new BufferedReader(new InputStreamReader(
-				new FileInputStream(todoFile), CHARSET))) {
+				new FileInputStream(todoFile), UTF_8))) {
 			String line = br.readLine();
 			while (line != null) {
 				int firstBlank = line.indexOf(' ');
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/ReflogCommandTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/ReflogCommandTest.java
index b07c703..8922837 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/ReflogCommandTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/ReflogCommandTest.java
@@ -89,7 +89,7 @@
 		Collection<ReflogEntry> reflog = git.reflog().call();
 		assertNotNull(reflog);
 		assertEquals(3, reflog.size());
-		ReflogEntry[] reflogs = reflog.toArray(new ReflogEntry[reflog.size()]);
+		ReflogEntry[] reflogs = reflog.toArray(new ReflogEntry[0]);
 		assertEquals(reflogs[2].getComment(),
 				"commit (initial): Initial commit");
 		assertEquals(reflogs[2].getNewId(), commit1.getId());
@@ -114,7 +114,7 @@
 				.setRef(Constants.R_HEADS + "b1").call();
 		assertNotNull(reflog);
 		assertEquals(2, reflog.size());
-		ReflogEntry[] reflogs = reflog.toArray(new ReflogEntry[reflog.size()]);
+		ReflogEntry[] reflogs = reflog.toArray(new ReflogEntry[0]);
 		assertEquals(reflogs[0].getComment(), "commit: Removed file");
 		assertEquals(reflogs[0].getNewId(), commit2.getId());
 		assertEquals(reflogs[0].getOldId(), commit1.getId());
@@ -136,7 +136,7 @@
 		Collection<ReflogEntry> reflog = git.reflog().call();
 		assertNotNull(reflog);
 		assertEquals(4, reflog.size());
-		ReflogEntry[] reflogs = reflog.toArray(new ReflogEntry[reflog.size()]);
+		ReflogEntry[] reflogs = reflog.toArray(new ReflogEntry[0]);
 		assertEquals(reflogs[3].getComment(),
 				"commit (initial): Initial commit");
 		assertEquals(reflogs[3].getNewId(), commit1.getId());
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/ResetCommandTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/ResetCommandTest.java
index 8f56a92..2b97b30 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/ResetCommandTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/ResetCommandTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011-2013, Chris Aniszczyk <caniszczyk@gmail.com>
+ * Copyright (C) 2011-2018, Chris Aniszczyk <caniszczyk@gmail.com>
  * and other copyright owners as documented in the project's IP log.
  *
  * This program and the accompanying materials are made available
@@ -52,7 +52,6 @@
 
 import java.io.File;
 import java.io.IOException;
-import java.io.PrintWriter;
 
 import org.eclipse.jgit.api.ResetCommand.ResetType;
 import org.eclipse.jgit.api.errors.GitAPIException;
@@ -94,45 +93,25 @@
 		git = new Git(db);
 		initialCommit = git.commit().setMessage("initial commit").call();
 
+		// create file
+		indexFile = writeTrashFile("a.txt", "content");
+
 		// create nested file
-		File dir = new File(db.getWorkTree(), "dir");
-		FileUtils.mkdir(dir);
-		File nestedFile = new File(dir, "b.txt");
-		FileUtils.createNewFile(nestedFile);
+		writeTrashFile("dir/b.txt", "content");
 
-		try (PrintWriter nestedFileWriter = new PrintWriter(nestedFile)) {
-			nestedFileWriter.print("content");
-			nestedFileWriter.flush();
+		// add files and commit them
+		git.add().addFilepattern("a.txt").addFilepattern("dir/b.txt").call();
+		secondCommit = git.commit().setMessage("adding a.txt and dir/b.txt").call();
 
-			// create file
-			indexFile = new File(db.getWorkTree(), "a.txt");
-			FileUtils.createNewFile(indexFile);
-			try (PrintWriter writer = new PrintWriter(indexFile)) {
-				writer.print("content");
-				writer.flush();
+		prestage = DirCache.read(db.getIndexFile(), db.getFS()).getEntry(indexFile.getName());
 
-				// add file and commit it
-				git.add().addFilepattern("dir").addFilepattern("a.txt").call();
-				secondCommit = git.commit()
-						.setMessage("adding a.txt and dir/b.txt").call();
-
-				prestage = DirCache.read(db.getIndexFile(), db.getFS())
-						.getEntry(indexFile.getName());
-
-				// modify file and add to index
-				writer.print("new content");
-			}
-			nestedFileWriter.print("new content");
-		}
-		git.add().addFilepattern("a.txt").addFilepattern("dir").call();
+		// modify files and add to index
+		writeTrashFile("a.txt", "new content");
+		writeTrashFile("dir/b.txt", "new content");
+		git.add().addFilepattern("a.txt").addFilepattern("dir/b.txt").call();
 
 		// create a file not added to the index
-		untrackedFile = new File(db.getWorkTree(),
-				"notAddedToIndex.txt");
-		FileUtils.createNewFile(untrackedFile);
-		try (PrintWriter writer2 = new PrintWriter(untrackedFile)) {
-			writer2.print("content");
-		}
+		untrackedFile = writeTrashFile("notAddedToIndex.txt", "content");
 	}
 
 	@Test
@@ -179,31 +158,29 @@
 	}
 
 	@Test
-	public void testHardResetWithConflicts_DoOverWriteUntrackedFile()
-			throws JGitInternalException,
-			AmbiguousObjectException, IOException, GitAPIException {
+	public void testHardResetWithConflicts_OverwriteUntrackedFile() throws Exception {
 		setupRepository();
+
 		git.rm().setCached(true).addFilepattern("a.txt").call();
 		assertTrue(new File(db.getWorkTree(), "a.txt").exists());
-		git.reset().setMode(ResetType.HARD).setRef(Constants.HEAD)
-				.call();
+
+		git.reset().setMode(ResetType.HARD).setRef(Constants.HEAD).call();
 		assertTrue(new File(db.getWorkTree(), "a.txt").exists());
 		assertEquals("content", read(new File(db.getWorkTree(), "a.txt")));
 	}
 
 	@Test
-	public void testHardResetWithConflicts_DoDeleteFileFolderConflicts()
-			throws JGitInternalException,
-			AmbiguousObjectException, IOException, GitAPIException {
+	public void testHardResetWithConflicts_DeleteFileFolderConflict() throws Exception {
 		setupRepository();
-		writeTrashFile("d/c.txt", "x");
-		git.add().addFilepattern("d/c.txt").call();
-		FileUtils.delete(new File(db.getWorkTree(), "d"), FileUtils.RECURSIVE);
-		writeTrashFile("d", "y");
 
-		git.reset().setMode(ResetType.HARD).setRef(Constants.HEAD)
-				.call();
-		assertFalse(new File(db.getWorkTree(), "d").exists());
+		writeTrashFile("dir-or-file/c.txt", "content");
+		git.add().addFilepattern("dir-or-file/c.txt").call();
+
+		FileUtils.delete(new File(db.getWorkTree(), "dir-or-file"), FileUtils.RECURSIVE);
+		writeTrashFile("dir-or-file", "content");
+
+		git.reset().setMode(ResetType.HARD).setRef(Constants.HEAD).call();
+		assertFalse(new File(db.getWorkTree(), "dir-or-file").exists());
 	}
 
 	@Test
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/StashApplyCommandTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/StashApplyCommandTest.java
index ad3ab7f..fa6c960 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/StashApplyCommandTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/api/StashApplyCommandTest.java
@@ -234,7 +234,7 @@
 		ObjectId unstashed = git.stashApply().call();
 		assertEquals(stashed, unstashed);
 		assertEquals("content2", read(subfolderFile));
-		recorder.assertEvent(new String[] { "d1/d2/f.txt", "d1/d2", "d1" },
+		recorder.assertEvent(new String[] { "d1/d2/f.txt" },
 				ChangeRecorder.EMPTY);
 
 		Status status = git.status().call();
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/attributes/CGitAttributesTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/attributes/CGitAttributesTest.java
index 344d1af..b661507 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/attributes/CGitAttributesTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/attributes/CGitAttributesTest.java
@@ -42,6 +42,7 @@
  */
 package org.eclipse.jgit.attributes;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 
@@ -57,7 +58,6 @@
 import java.util.Set;
 
 import org.eclipse.jgit.junit.RepositoryTestCase;
-import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.StoredConfig;
 import org.eclipse.jgit.treewalk.FileTreeIterator;
 import org.eclipse.jgit.treewalk.TreeWalk;
@@ -127,14 +127,14 @@
 		builder.directory(db.getWorkTree());
 		builder.environment().put("HOME", fs.userHome().getAbsolutePath());
 		ExecutionResult result = fs.execute(builder, new ByteArrayInputStream(
-				input.toString().getBytes(Constants.CHARSET)));
+				input.toString().getBytes(UTF_8)));
 		String errorOut = toString(result.getStderr());
 		assertEquals("External git failed", "exit 0\n",
 				"exit " + result.getRc() + '\n' + errorOut);
 		LinkedHashMap<String, Attributes> map = new LinkedHashMap<>();
 		try (BufferedReader r = new BufferedReader(new InputStreamReader(
 				new BufferedInputStream(result.getStdout().openInputStream()),
-				Constants.CHARSET))) {
+				UTF_8))) {
 			r.lines().forEach(line -> {
 				// Parse the line and add to result map
 				int start = 0;
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/AbstractDiffTestCase.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/AbstractDiffTestCase.java
index 32f3421..0f13a68 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/AbstractDiffTestCase.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/AbstractDiffTestCase.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.diff;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 
@@ -240,6 +240,6 @@
 			r.append(text.charAt(i));
 			r.append('\n');
 		}
-		return new RawText(r.toString().getBytes(CHARSET));
+		return new RawText(r.toString().getBytes(UTF_8));
 	}
 }
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/RawTextTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/RawTextTest.java
index 58a8b2d..5885d9b 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/RawTextTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/RawTextTest.java
@@ -44,7 +44,7 @@
 
 package org.eclipse.jgit.diff;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -147,8 +147,8 @@
 		e = c.reduceCommonStartEnd(t("abQxy"), t("abRxy"), e);
 		assertEquals(new Edit(2, 3, 2, 3), e);
 
-		RawText a = new RawText("p\na b\nQ\nc d\n".getBytes(CHARSET));
-		RawText b = new RawText("p\na  b \nR\n c  d \n".getBytes(CHARSET));
+		RawText a = new RawText("p\na b\nQ\nc d\n".getBytes(UTF_8));
+		RawText b = new RawText("p\na  b \nR\n c  d \n".getBytes(UTF_8));
 		e = new Edit(0, 4, 0, 4);
 		e = RawTextComparator.WS_IGNORE_ALL.reduceCommonStartEnd(a, b, e);
 		assertEquals(new Edit(2, 3, 2, 3), e);
@@ -160,14 +160,14 @@
 		RawText b;
 		Edit e;
 
-		a = new RawText("R\n y\n".getBytes(CHARSET));
-		b = new RawText("S\n\n y\n".getBytes(CHARSET));
+		a = new RawText("R\n y\n".getBytes(UTF_8));
+		b = new RawText("S\n\n y\n".getBytes(UTF_8));
 		e = new Edit(0, 2, 0, 3);
 		e = RawTextComparator.DEFAULT.reduceCommonStartEnd(a, b, e);
 		assertEquals(new Edit(0, 1, 0, 2), e);
 
-		a = new RawText("S\n\n y\n".getBytes(CHARSET));
-		b = new RawText("R\n y\n".getBytes(CHARSET));
+		a = new RawText("S\n\n y\n".getBytes(UTF_8));
+		b = new RawText("R\n y\n".getBytes(UTF_8));
 		e = new Edit(0, 3, 0, 2);
 		e = RawTextComparator.DEFAULT.reduceCommonStartEnd(a, b, e);
 		assertEquals(new Edit(0, 2, 0, 1), e);
@@ -178,8 +178,8 @@
 		RawText a;
 		RawText b;
 		Edit e;
-		a = new RawText("start".getBytes(CHARSET));
-		b = new RawText("start of line".getBytes(CHARSET));
+		a = new RawText("start".getBytes(UTF_8));
+		b = new RawText("start of line".getBytes(UTF_8));
 		e = new Edit(0, 1, 0, 1);
 		e = RawTextComparator.DEFAULT.reduceCommonStartEnd(a, b, e);
 		assertEquals(new Edit(0, 1, 0, 1), e);
@@ -190,8 +190,8 @@
 		RawText a;
 		RawText b;
 		Edit e;
-		a = new RawText("start".getBytes(CHARSET));
-		b = new RawText("start of\nlastline".getBytes(CHARSET));
+		a = new RawText("start".getBytes(UTF_8));
+		b = new RawText("start of\nlastline".getBytes(UTF_8));
 		e = new Edit(0, 1, 0, 2);
 		e = RawTextComparator.DEFAULT.reduceCommonStartEnd(a, b, e);
 		assertEquals(new Edit(0, 1, 0, 2), e);
@@ -250,6 +250,6 @@
 			r.append(text.charAt(i));
 			r.append('\n');
 		}
-		return new RawText(r.toString().getBytes(CHARSET));
+		return new RawText(r.toString().getBytes(UTF_8));
 	}
 }
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/SimilarityIndexTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/SimilarityIndexTest.java
index 51a6f81..f168e83 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/SimilarityIndexTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/SimilarityIndexTest.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.diff;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 
@@ -82,7 +82,7 @@
 				+ "A\n" //
 				+ "B\n" //
 				+ "B\n" //
-				+ "B\n").getBytes(CHARSET);
+				+ "B\n").getBytes(UTF_8);
 		SimilarityIndex si = new SimilarityIndex();
 		si.hash(new ByteArrayInputStream(in), in.length, false);
 		assertEquals(2, si.size());
@@ -130,12 +130,12 @@
 				+ "D\r\n" //
 				+ "B\r\n";
 		SimilarityIndex src = new SimilarityIndex();
-		byte[] bytes1 = text.getBytes(CHARSET);
+		byte[] bytes1 = text.getBytes(UTF_8);
 		src.hash(new ByteArrayInputStream(bytes1), bytes1.length, true);
 		src.sort();
 
 		SimilarityIndex dst = new SimilarityIndex();
-		byte[] bytes2 = text.replace("\r", "").getBytes(CHARSET);
+		byte[] bytes2 = text.replace("\r", "").getBytes(UTF_8);
 		dst.hash(new ByteArrayInputStream(bytes2), bytes2.length, true);
 		dst.sort();
 
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/dircache/DirCacheCGitCompatabilityTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/dircache/DirCacheCGitCompatabilityTest.java
index c362e74..847d0ab 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/dircache/DirCacheCGitCompatabilityTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/dircache/DirCacheCGitCompatabilityTest.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.dircache;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.junit.Assert.assertEquals;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
@@ -236,7 +236,7 @@
 	private static Map<String, CGitIndexRecord> readLsFiles() throws Exception {
 		final LinkedHashMap<String, CGitIndexRecord> r = new LinkedHashMap<>();
 		try (BufferedReader br = new BufferedReader(new InputStreamReader(
-				new FileInputStream(pathOf("gitgit.lsfiles")), CHARSET))) {
+				new FileInputStream(pathOf("gitgit.lsfiles")), UTF_8))) {
 			String line;
 			while ((line = br.readLine()) != null) {
 				final CGitIndexRecord cr = new CGitIndexRecord(line);
@@ -249,7 +249,7 @@
 	private static Map<String, CGitLsTreeRecord> readLsTree() throws Exception {
 		final LinkedHashMap<String, CGitLsTreeRecord> r = new LinkedHashMap<>();
 		try (BufferedReader br = new BufferedReader(new InputStreamReader(
-				new FileInputStream(pathOf("gitgit.lstree")), CHARSET))) {
+				new FileInputStream(pathOf("gitgit.lstree")), UTF_8))) {
 			String line;
 			while ((line = br.readLine()) != null) {
 				final CGitLsTreeRecord cr = new CGitLsTreeRecord(line);
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/gitrepo/ManifestParserTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/gitrepo/ManifestParserTest.java
index 69a48cc..88a0776 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/gitrepo/ManifestParserTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/gitrepo/ManifestParserTest.java
@@ -42,7 +42,8 @@
  */
 package org.eclipse.jgit.gitrepo;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
+import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
@@ -51,6 +52,8 @@
 import java.net.URI;
 import java.util.HashSet;
 import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 import org.junit.Test;
 import org.xml.sax.SAXException;
@@ -82,7 +85,7 @@
 
 		ManifestParser parser = new ManifestParser(
 				null, null, "master", baseUrl, null, null);
-		parser.read(new ByteArrayInputStream(xmlContent.toString().getBytes(CHARSET)));
+		parser.read(new ByteArrayInputStream(xmlContent.toString().getBytes(UTF_8)));
 		// Unfiltered projects should have them all.
 		results.clear();
 		results.add("foo");
@@ -136,7 +139,7 @@
 				baseUrl, null, null);
 		try {
 			parser.read(new ByteArrayInputStream(
-					xmlContent.toString().getBytes(CHARSET)));
+					xmlContent.toString().getBytes(UTF_8)));
 			fail("ManifestParser did not throw exception for missing fetch");
 		} catch (IOException e) {
 			assertTrue(e.getCause() instanceof SAXException);
@@ -145,6 +148,29 @@
 		}
 	}
 
+	@Test
+	public void testRemoveProject() throws Exception {
+		StringBuilder xmlContent = new StringBuilder();
+		xmlContent.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n")
+				.append("<manifest>")
+				.append("<remote name=\"remote1\" fetch=\".\" />")
+				.append("<default revision=\"master\" remote=\"remote1\" />")
+				.append("<project path=\"foo\" name=\"foo\" />")
+				.append("<project path=\"bar\" name=\"bar\" />")
+				.append("<remove-project name=\"foo\" />")
+				.append("<project path=\"foo\" name=\"baz\" />")
+				.append("</manifest>");
+
+		ManifestParser parser = new ManifestParser(null, null, "master",
+				"https://git.google.com/", null, null);
+		parser.read(new ByteArrayInputStream(
+				xmlContent.toString().getBytes(UTF_8)));
+
+		assertEquals(Stream.of("bar", "baz").collect(Collectors.toSet()),
+				parser.getProjects().stream().map(RepoProject::getName)
+						.collect(Collectors.toSet()));
+	}
+
 	void testNormalize(String in, String want) {
 		URI got = ManifestParser.normalizeEmptyPath(URI.create(in));
 		if (!got.toString().equals(want)) {
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/gitrepo/RepoCommandTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/gitrepo/RepoCommandTest.java
index df31ab0..92f0cf6 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/gitrepo/RepoCommandTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/gitrepo/RepoCommandTest.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.gitrepo;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNull;
@@ -217,7 +217,7 @@
 
 			RevCommit commit = cmd
 					.setInputStream(new ByteArrayInputStream(
-							xmlContent.toString().getBytes(CHARSET)))
+							xmlContent.toString().getBytes(UTF_8)))
 					.setRemoteReader(repos).setURI("platform/")
 					.setTargetURI("platform/superproject")
 					.setRecordRemoteBranch(true).setRecordSubmoduleLabels(true)
@@ -226,7 +226,7 @@
 			String firstIdStr = commit.getId().name() + ":" + ".gitmodules";
 			commit = new RepoCommand(dest)
 					.setInputStream(new ByteArrayInputStream(
-							xmlContent.toString().getBytes(CHARSET)))
+							xmlContent.toString().getBytes(UTF_8)))
 					.setRemoteReader(repos).setURI("platform/")
 					.setTargetURI("platform/superproject")
 					.setRecordRemoteBranch(true).setRecordSubmoduleLabels(true)
@@ -254,7 +254,7 @@
 
 			RevCommit commit = cmd
 					.setInputStream(new ByteArrayInputStream(
-							xmlContent.toString().getBytes(CHARSET)))
+							xmlContent.toString().getBytes(UTF_8)))
 					.setRemoteReader(repos).setURI("platform/")
 					.setTargetURI("platform/superproject")
 					.setRecordRemoteBranch(true).setRecordSubmoduleLabels(true)
@@ -268,7 +268,8 @@
 						.getCachedBytes(Integer.MAX_VALUE);
 				Config base = new Config();
 				BlobBasedConfig cfg = new BlobBasedConfig(base, bytes);
-				String subUrl = cfg.getString("submodule", "base", "url");
+				String subUrl = cfg.getString("submodule", "platform/base",
+						"url");
 				assertEquals(subUrl, "../base");
 			}
 		}
@@ -287,7 +288,7 @@
 		try (Repository dest = cloneRepository(db, true)) {
 			RevCommit commit = new RepoCommand(dest)
 					.setInputStream(new ByteArrayInputStream(
-							xmlContent.toString().getBytes(CHARSET)))
+							xmlContent.toString().getBytes(UTF_8)))
 					.setRemoteReader(new IndexedRepos()).setURI("platform/")
 					.setTargetURI("platform/superproject")
 					.setRecordRemoteBranch(true).setIgnoreRemoteFailures(true)
@@ -301,7 +302,8 @@
 						.getCachedBytes(Integer.MAX_VALUE);
 				Config base = new Config();
 				BlobBasedConfig cfg = new BlobBasedConfig(base, bytes);
-				String subUrl = cfg.getString("submodule", "base", "url");
+				String subUrl = cfg.getString("submodule", "platform/base",
+						"url");
 				assertEquals(subUrl, "https://host.com/platform/base");
 			}
 		}
@@ -325,7 +327,7 @@
 
 			RevCommit commit = cmd
 					.setInputStream(new ByteArrayInputStream(
-							xmlContent.toString().getBytes(CHARSET)))
+							xmlContent.toString().getBytes(UTF_8)))
 					.setRemoteReader(repos).setURI("").setTargetURI("gerrit")
 					.setRecordRemoteBranch(true).setRecordSubmoduleLabels(true)
 					.call();
@@ -374,7 +376,7 @@
 
 					RevCommit commit = cmd
 							.setInputStream(new ByteArrayInputStream(
-									xmlContent.toString().getBytes(CHARSET)))
+									xmlContent.toString().getBytes(UTF_8)))
 							.setRemoteReader(repos).setURI(baseUrl)
 							.setTargetURI("gerrit").setRecordRemoteBranch(true)
 							.setRecordSubmoduleLabels(true).call();
@@ -387,8 +389,8 @@
 								.getCachedBytes(Integer.MAX_VALUE);
 						Config base = new Config();
 						BlobBasedConfig cfg = new BlobBasedConfig(base, bytes);
-						String subUrl = cfg.getString("submodule", "src",
-								"url");
+						String subUrl = cfg.getString("submodule",
+								"chromium/src", "url");
 						assertEquals(
 								"https://chromium.googlesource.com/chromium/src",
 								subUrl);
@@ -429,7 +431,7 @@
 
 					RevCommit commit = cmd
 							.setInputStream(new ByteArrayInputStream(
-									xmlContent.toString().getBytes(CHARSET)))
+									xmlContent.toString().getBytes(UTF_8)))
 							.setRemoteReader(repos).setURI(baseUrl)
 							.setTargetURI(abs + "/superproject")
 							.setRecordRemoteBranch(true)
@@ -443,8 +445,8 @@
 								.getCachedBytes(Integer.MAX_VALUE);
 						Config base = new Config();
 						BlobBasedConfig cfg = new BlobBasedConfig(base, bytes);
-						String subUrl = cfg.getString("submodule", "src",
-								"url");
+						String subUrl = cfg.getString("submodule",
+								"chromium/src", "url");
 						assertEquals("../chromium/src", subUrl);
 					}
 					fetchSlash = !fetchSlash;
@@ -613,7 +615,7 @@
 				String content = reader.readLine();
 				assertEquals(
 						"The first line of .gitmodules file should be as expected",
-						"[submodule \"foo\"]", content);
+						"[submodule \"" + defaultUri + "\"]", content);
 			}
 			// The gitlink should be the same as remote head sha1
 			String gitlink = localDb.resolve(Constants.HEAD + ":foo").name();
@@ -801,9 +803,9 @@
 				.append("<manifest>")
 				.append("<remote name=\"remote1\" fetch=\".\" />")
 				.append("<default revision=\"master\" remote=\"remote1\" />")
-				.append("<project path=\"bar\" name=\"").append(defaultUri)
-				.append("\" revision=\"").append(BRANCH).append("\" >")
-				.append("<copyfile src=\"hello.txt\" dest=\"Hello.txt\" />")
+				.append("<project path=\"bar\" name=\"").append(notDefaultUri)
+				.append("\" >")
+				.append("<copyfile src=\"world.txt\" dest=\"World.txt\" />")
 				.append("</project>").append("</manifest>");
 		JGitTestUtil.writeTrashFile(tempDb, "new.xml", xmlContent.toString());
 		command = new RepoCommand(remoteDb);
@@ -819,8 +821,8 @@
 			File hello = new File(localDb.getWorkTree(), "Hello");
 			assertFalse("The Hello file shouldn't exist", hello.exists());
 			// The Hello.txt file should exist
-			File hellotxt = new File(localDb.getWorkTree(), "Hello.txt");
-			assertTrue("The Hello.txt file should exist", hellotxt.exists());
+			File hellotxt = new File(localDb.getWorkTree(), "World.txt");
+			assertTrue("The World.txt file should exist", hellotxt.exists());
 			dotmodules = new File(localDb.getWorkTree(),
 					Constants.DOT_GIT_MODULES);
 		}
@@ -835,9 +837,9 @@
 				String line = reader.readLine();
 				if (line == null)
 					break;
-				if (line.contains("submodule \"foo\""))
+				if (line.contains("submodule \"" + defaultUri + "\""))
 					foo = true;
-				if (line.contains("submodule \"bar\""))
+				if (line.contains("submodule \"" + notDefaultUri + "\""))
 					bar = true;
 			}
 			assertTrue("The bar submodule should exist", bar);
@@ -876,9 +878,7 @@
 				Constants.DOT_GIT_MODULES);
 		}
 
-		// The .gitmodules file should have 'submodule "foo"' and shouldn't
-		// have
-		// 'submodule "foo/bar"' lines.
+		// Check .gitmodules file
 		try (BufferedReader reader = new BufferedReader(
 				new FileReader(dotmodules))) {
 			boolean foo = false;
@@ -888,16 +888,17 @@
 				String line = reader.readLine();
 				if (line == null)
 					break;
-				if (line.contains("submodule \"foo\""))
+				if (line.contains("submodule \"" + defaultUri + "\""))
 					foo = true;
-				if (line.contains("submodule \"foo/bar\""))
+				if (line.contains("submodule \"" + groupBUri + "\""))
 					foobar = true;
-				if (line.contains("submodule \"a\""))
+				if (line.contains("submodule \"" + groupAUri + "\""))
 					a = true;
 			}
-			assertTrue("The foo submodule should exist", foo);
-			assertFalse("The foo/bar submodule shouldn't exist", foobar);
-			assertTrue("The a submodule should exist", a);
+			assertTrue("The " + defaultUri + " submodule should exist", foo);
+			assertFalse("The " + groupBUri + " submodule shouldn't exist",
+					foobar);
+			assertTrue("The " + groupAUri + " submodule should exist", a);
 		}
 	}
 
@@ -1033,11 +1034,11 @@
 			assertEquals(
 					"Recording remote branches should work for short branch descriptions",
 					"master",
-					c.getString("submodule", "with-branch", "branch"));
+					c.getString("submodule", notDefaultUri, "branch"));
 			assertEquals(
 					"Recording remote branches should work for full ref specs",
 					"refs/heads/master",
-					c.getString("submodule", "with-long-branch", "branch"));
+					c.getString("submodule", defaultUri, "branch"));
 		}
 	}
 
@@ -1095,7 +1096,7 @@
 				.append("<project path=\"shallow-please\" ").append("name=\"")
 				.append(defaultUri).append("\" ").append("clone-depth=\"1\" />")
 				.append("<project path=\"non-shallow\" ").append("name=\"")
-				.append(defaultUri).append("\" />").append("</manifest>");
+				.append(notDefaultUri).append("\" />").append("</manifest>");
 		JGitTestUtil.writeTrashFile(tempDb, "manifest.xml",
 				xmlContent.toString());
 
@@ -1115,9 +1116,9 @@
 			FileBasedConfig c = new FileBasedConfig(gitmodules, FS.DETECTED);
 			c.load();
 			assertEquals("Recording shallow configuration should work", "true",
-					c.getString("submodule", "shallow-please", "shallow"));
+					c.getString("submodule", defaultUri, "shallow"));
 			assertNull("Recording non shallow configuration should work",
-					c.getString("submodule", "non-shallow", "shallow"));
+					c.getString("submodule", notDefaultUri, "shallow"));
 		}
 	}
 
@@ -1176,6 +1177,43 @@
 		}
 	}
 
+	@Test
+	public void testTwoPathUseTheSameName() throws Exception {
+		Repository remoteDb = createBareRepository();
+		Repository tempDb = createWorkRepository();
+
+		StringBuilder xmlContent = new StringBuilder();
+		xmlContent.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n")
+				.append("<manifest>")
+				.append("<remote name=\"remote1\" fetch=\".\" />")
+				.append("<default revision=\"master\" remote=\"remote1\" />")
+				.append("<project path=\"path1\" ").append("name=\"")
+				.append(defaultUri).append("\" />")
+				.append("<project path=\"path2\" ").append("name=\"")
+				.append(defaultUri).append("\" />").append("</manifest>");
+		JGitTestUtil.writeTrashFile(tempDb, "manifest.xml",
+				xmlContent.toString());
+
+		RepoCommand command = new RepoCommand(remoteDb);
+		command.setPath(
+				tempDb.getWorkTree().getAbsolutePath() + "/manifest.xml")
+				.setURI(rootUri).setRecommendShallow(true).call();
+		File directory = createTempDirectory("testBareRepo");
+		try (Repository localDb = Git.cloneRepository().setDirectory(directory)
+				.setURI(remoteDb.getDirectory().toURI().toString()).call()
+				.getRepository();) {
+			File gitmodules = new File(localDb.getWorkTree(), ".gitmodules");
+			assertTrue("The .gitmodules file should exist",
+					gitmodules.exists());
+			FileBasedConfig c = new FileBasedConfig(gitmodules, FS.DETECTED);
+			c.load();
+			assertEquals("A module should exist for path1", "path1",
+					c.getString("submodule", defaultUri + "/path1", "path"));
+			assertEquals("A module should exist for path2", "path2",
+					c.getString("submodule", defaultUri + "/path2", "path"));
+		}
+	}
+
 	private void resolveRelativeUris() {
 		// Find the longest common prefix ends with "/" as rootUri.
 		defaultUri = defaultDb.getDirectory().toURI().toString();
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/ignore/CGitIgnoreTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/ignore/CGitIgnoreTest.java
index 0c6ed0c..b4c20a7 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/ignore/CGitIgnoreTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/ignore/CGitIgnoreTest.java
@@ -42,6 +42,7 @@
  */
 package org.eclipse.jgit.ignore;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -56,7 +57,6 @@
 import java.util.Set;
 
 import org.eclipse.jgit.junit.RepositoryTestCase;
-import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.StoredConfig;
 import org.eclipse.jgit.treewalk.FileTreeIterator;
 import org.eclipse.jgit.treewalk.TreeWalk;
@@ -113,7 +113,7 @@
 				"exit " + result.getRc() + '\n' + errorOut);
 		try (BufferedReader r = new BufferedReader(new InputStreamReader(
 				new BufferedInputStream(result.getStdout().openInputStream()),
-				Constants.CHARSET))) {
+				UTF_8))) {
 			return r.lines().toArray(String[]::new);
 		}
 	}
@@ -131,7 +131,7 @@
 				"exit " + result.getRc() + '\n' + errorOut);
 		try (BufferedReader r = new BufferedReader(new InputStreamReader(
 				new BufferedInputStream(result.getStdout().openInputStream()),
-				Constants.CHARSET))) {
+				UTF_8))) {
 			return r.lines().toArray(String[]::new);
 		}
 	}
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/ignore/IgnoreNodeTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/ignore/IgnoreNodeTest.java
index 78d9a82..cbc0761 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/ignore/IgnoreNodeTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/ignore/IgnoreNodeTest.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.ignore;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.junit.Assert.assertEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -767,6 +767,6 @@
 		for (String line : rules) {
 			data.append(line + "\n");
 		}
-		return new ByteArrayInputStream(data.toString().getBytes(CHARSET));
+		return new ByteArrayInputStream(data.toString().getBytes(UTF_8));
 	}
 }
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/indexdiff/IndexDiffWithSymlinkTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/indexdiff/IndexDiffWithSymlinkTest.java
index 26c11c7..7e513d2 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/indexdiff/IndexDiffWithSymlinkTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/indexdiff/IndexDiffWithSymlinkTest.java
@@ -41,7 +41,7 @@
  */
 package org.eclipse.jgit.indexdiff;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
@@ -128,7 +128,7 @@
 		File restoreScript = new File(testDir, name + ".sh");
 		try (OutputStream out = new BufferedOutputStream(
 				new FileOutputStream(restoreScript));
-				Writer writer = new OutputStreamWriter(out, CHARSET)) {
+				Writer writer = new OutputStreamWriter(out, UTF_8)) {
 			writer.write("echo `which git` 1>&2\n");
 			writer.write("echo `git --version` 1>&2\n");
 			writer.write("git init " + name + " && \\\n");
@@ -170,7 +170,7 @@
 
 	private String readStream(InputStream stream) throws IOException {
 		try (BufferedReader in = new BufferedReader(
-				new InputStreamReader(stream))) {
+				new InputStreamReader(stream, UTF_8))) {
 			StringBuilder out = new StringBuilder();
 			String line;
 			while ((line = in.readLine()) != null) {
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsGarbageCollectorTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsGarbageCollectorTest.java
index 5b567d0..bfa30d5 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsGarbageCollectorTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsGarbageCollectorTest.java
@@ -972,7 +972,7 @@
 	private static boolean isReachable(Repository repo, AnyObjectId id)
 			throws IOException {
 		try (RevWalk rw = new RevWalk(repo)) {
-			for (Ref ref : repo.getAllRefs().values()) {
+			for (Ref ref : repo.getRefDatabase().getRefs()) {
 				rw.markStart(rw.parseCommit(ref.getObjectId()));
 			}
 			for (RevCommit next; (next = rw.next()) != null;) {
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsPackDescriptionTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsPackDescriptionTest.java
new file mode 100644
index 0000000..55e1a9c
--- /dev/null
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsPackDescriptionTest.java
@@ -0,0 +1,293 @@
+/*
+ * Copyright (C) 2018, Google LLC.
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.eclipse.jgit.internal.storage.dfs;
+
+import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.COMPACT;
+import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.GC;
+import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.GC_REST;
+import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.GC_TXN;
+import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.INSERT;
+import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.RECEIVE;
+import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.UNREACHABLE_GARBAGE;
+import static org.eclipse.jgit.internal.storage.pack.PackExt.INDEX;
+import static org.eclipse.jgit.internal.storage.pack.PackExt.PACK;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Comparator;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource;
+import org.junit.Before;
+import org.junit.Test;
+
+public final class DfsPackDescriptionTest {
+	private AtomicInteger counter;
+
+	@Before
+	public void setUp() {
+		counter = new AtomicInteger();
+	}
+
+	@Test
+	public void objectLookupComparatorEqual() throws Exception {
+		DfsPackDescription a = create(RECEIVE);
+		a.setFileSize(PACK, 1);
+		a.setFileSize(INDEX, 1);
+		a.setLastModified(1);
+		a.setObjectCount(1);
+		a.setMaxUpdateIndex(1);
+
+		DfsPackDescription b = create(INSERT);
+		b.setFileSize(PACK, 1);
+		b.setFileSize(INDEX, 2);
+		b.setLastModified(1);
+		b.setObjectCount(1);
+		b.setMaxUpdateIndex(2);
+
+		assertComparesEqual(DfsPackDescription.objectLookupComparator(), a, b);
+	}
+
+	@Test
+	public void objectLookupComparatorPackSource() throws Exception {
+		DfsPackDescription a = create(COMPACT);
+		a.setFileSize(PACK, 2);
+		a.setLastModified(1);
+		a.setObjectCount(2);
+
+		DfsPackDescription b = create(GC);
+		b.setFileSize(PACK, 1);
+		b.setLastModified(2);
+		b.setObjectCount(1);
+
+		assertComparesLessThan(DfsPackDescription.objectLookupComparator(), a, b);
+	}
+
+	@Test
+	public void objectLookupComparatorCustomPackSourceComparator()
+			throws Exception {
+		DfsPackDescription a = create(GC);
+
+		DfsPackDescription b = create(COMPACT);
+
+		assertComparesLessThan(DfsPackDescription.objectLookupComparator(), b, a);
+		assertComparesLessThan(
+				DfsPackDescription.objectLookupComparator(
+					new PackSource.ComparatorBuilder()
+						.add(GC)
+						.add(INSERT, RECEIVE, GC_REST, GC_TXN, UNREACHABLE_GARBAGE)
+						.add(COMPACT)
+						.build()),
+				a, b);
+	}
+
+	@Test
+	public void objectLookupComparatorGcFileSize() throws Exception {
+		// a is older and smaller.
+		DfsPackDescription a = create(GC_REST);
+		a.setFileSize(PACK, 100);
+		a.setLastModified(1);
+		a.setObjectCount(2);
+
+		// b is newer and larger.
+		DfsPackDescription b = create(GC_REST);
+		b.setFileSize(PACK, 200);
+		b.setLastModified(2);
+		b.setObjectCount(1);
+
+		// Since they have the same GC type, tiebreaker is size, and a comes first.
+		assertComparesLessThan(DfsPackDescription.objectLookupComparator(), a, b);
+	}
+
+	@Test
+	public void objectLookupComparatorNonGcLastModified()
+			throws Exception {
+		// a is older and smaller.
+		DfsPackDescription a = create(INSERT);
+		a.setFileSize(PACK, 100);
+		a.setLastModified(1);
+		a.setObjectCount(2);
+
+		// b is newer and larger.
+		DfsPackDescription b = create(INSERT);
+		b.setFileSize(PACK, 200);
+		b.setLastModified(2);
+		b.setObjectCount(1);
+
+		// Since they have the same type but not GC, tiebreaker is last modified,
+		// and b comes first.
+		assertComparesLessThan(DfsPackDescription.objectLookupComparator(), b, a);
+	}
+
+	@Test
+	public void objectLookupComparatorObjectCount() throws Exception {
+		DfsPackDescription a = create(INSERT);
+		a.setObjectCount(1);
+
+		DfsPackDescription b = create(INSERT);
+		b.setObjectCount(2);
+
+		assertComparesLessThan(DfsPackDescription.objectLookupComparator(), a, b);
+	}
+
+	@Test
+	public void reftableComparatorEqual() throws Exception {
+		DfsPackDescription a = create(INSERT);
+		a.setFileSize(PACK, 100);
+		a.setObjectCount(1);
+
+		DfsPackDescription b = create(INSERT);
+		b.setFileSize(PACK, 200);
+		a.setObjectCount(2);
+
+		assertComparesEqual(DfsPackDescription.reftableComparator(), a, b);
+	}
+
+	@Test
+	public void reftableComparatorPackSource() throws Exception {
+		DfsPackDescription a = create(INSERT);
+		a.setMaxUpdateIndex(1);
+		a.setLastModified(1);
+
+		DfsPackDescription b = create(GC);
+		b.setMaxUpdateIndex(2);
+		b.setLastModified(2);
+
+		assertComparesLessThan(DfsPackDescription.reftableComparator(), b, a);
+	}
+
+	@Test
+	public void reftableComparatorMaxUpdateIndex() throws Exception {
+		DfsPackDescription a = create(INSERT);
+		a.setMaxUpdateIndex(1);
+		a.setLastModified(2);
+
+		DfsPackDescription b = create(INSERT);
+		b.setMaxUpdateIndex(2);
+		b.setLastModified(1);
+
+		assertComparesLessThan(DfsPackDescription.reftableComparator(), a, b);
+	}
+
+	@Test
+	public void reftableComparatorLastModified() throws Exception {
+		DfsPackDescription a = create(INSERT);
+		a.setLastModified(1);
+
+		DfsPackDescription b = create(INSERT);
+		b.setLastModified(2);
+
+		assertComparesLessThan(DfsPackDescription.reftableComparator(), a, b);
+	}
+
+	@Test
+	public void reuseComparatorEqual() throws Exception {
+		DfsPackDescription a = create(RECEIVE);
+		a.setFileSize(PACK, 1);
+		a.setFileSize(INDEX, 1);
+		a.setLastModified(1);
+		a.setObjectCount(1);
+		a.setMaxUpdateIndex(1);
+
+		DfsPackDescription b = create(INSERT);
+		b.setFileSize(PACK, 2);
+		b.setFileSize(INDEX, 2);
+		b.setLastModified(2);
+		b.setObjectCount(2);
+		b.setMaxUpdateIndex(2);
+
+		assertComparesEqual(DfsPackDescription.reuseComparator(), a, b);
+	}
+
+	@Test
+	public void reuseComparatorGcPackSize() throws Exception {
+		DfsPackDescription a = create(GC_REST);
+		a.setFileSize(PACK, 1);
+		a.setFileSize(INDEX, 1);
+		a.setLastModified(2);
+		a.setObjectCount(1);
+		a.setMaxUpdateIndex(1);
+
+		DfsPackDescription b = create(GC_REST);
+		b.setFileSize(PACK, 2);
+		b.setFileSize(INDEX, 2);
+		b.setLastModified(1);
+		b.setObjectCount(2);
+		b.setMaxUpdateIndex(2);
+
+		assertComparesLessThan(DfsPackDescription.reuseComparator(), b, a);
+	}
+
+	private DfsPackDescription create(PackSource source) {
+		return new DfsPackDescription(
+				new DfsRepositoryDescription("repo"),
+				"pack_" + counter.incrementAndGet(),
+				source);
+	}
+
+	private static <T> void assertComparesEqual(
+			Comparator<T> comparator, T o1, T o2) {
+		assertEquals(
+				"first object must compare equal to itself",
+				0, comparator.compare(o1, o1));
+		assertEquals(
+				"second object must compare equal to itself",
+				0, comparator.compare(o2, o2));
+		assertEquals(
+				"first object must compare equal to second object",
+				0, comparator.compare(o1, o2));
+	}
+
+	private static <T> void assertComparesLessThan(
+			Comparator<T> comparator, T o1, T o2) {
+		assertEquals(
+				"first object must compare equal to itself",
+				0, comparator.compare(o1, o1));
+		assertEquals(
+				"second object must compare equal to itself",
+				0, comparator.compare(o2, o2));
+		assertEquals(
+				"first object must compare less than second object",
+				-1, comparator.compare(o1, o2));
+	}
+}
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/PackSourceTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/PackSourceTest.java
new file mode 100644
index 0000000..7bf1f58
--- /dev/null
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/PackSourceTest.java
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2018, Google LLC.
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.eclipse.jgit.internal.storage.dfs;
+
+import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.COMPACT;
+import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.DEFAULT_COMPARATOR;
+import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.GC;
+import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.GC_REST;
+import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.GC_TXN;
+import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.INSERT;
+import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.RECEIVE;
+import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.UNREACHABLE_GARBAGE;
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+public class PackSourceTest {
+	@Test
+	public void defaultComaprator() throws Exception {
+		assertEquals(0, DEFAULT_COMPARATOR.compare(INSERT, INSERT));
+		assertEquals(0, DEFAULT_COMPARATOR.compare(RECEIVE, RECEIVE));
+		assertEquals(0, DEFAULT_COMPARATOR.compare(COMPACT, COMPACT));
+		assertEquals(0, DEFAULT_COMPARATOR.compare(GC, GC));
+		assertEquals(0, DEFAULT_COMPARATOR.compare(GC_REST, GC_REST));
+		assertEquals(0, DEFAULT_COMPARATOR.compare(GC_TXN, GC_TXN));
+		assertEquals(0, DEFAULT_COMPARATOR.compare(UNREACHABLE_GARBAGE, UNREACHABLE_GARBAGE));
+
+		assertEquals(0, DEFAULT_COMPARATOR.compare(INSERT, RECEIVE));
+		assertEquals(0, DEFAULT_COMPARATOR.compare(RECEIVE, INSERT));
+
+		assertEquals(-1, DEFAULT_COMPARATOR.compare(INSERT, COMPACT));
+		assertEquals(1, DEFAULT_COMPARATOR.compare(COMPACT, INSERT));
+
+		assertEquals(-1, DEFAULT_COMPARATOR.compare(RECEIVE, COMPACT));
+		assertEquals(1, DEFAULT_COMPARATOR.compare(COMPACT, RECEIVE));
+
+		assertEquals(-1, DEFAULT_COMPARATOR.compare(COMPACT, GC));
+		assertEquals(1, DEFAULT_COMPARATOR.compare(GC, COMPACT));
+
+		assertEquals(-1, DEFAULT_COMPARATOR.compare(GC, GC_REST));
+		assertEquals(1, DEFAULT_COMPARATOR.compare(GC_REST, GC));
+
+		assertEquals(-1, DEFAULT_COMPARATOR.compare(GC_REST, GC_TXN));
+		assertEquals(1, DEFAULT_COMPARATOR.compare(GC_TXN, GC_REST));
+
+		assertEquals(-1, DEFAULT_COMPARATOR.compare(GC_TXN, UNREACHABLE_GARBAGE));
+		assertEquals(1, DEFAULT_COMPARATOR.compare(UNREACHABLE_GARBAGE, GC_TXN));
+	}
+}
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/RefUpdateTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/RefUpdateTest.java
index e1adeed..3a43564 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/RefUpdateTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/RefUpdateTest.java
@@ -46,7 +46,7 @@
 package org.eclipse.jgit.internal.storage.file;
 
 import static org.eclipse.jgit.junit.Assert.assertEquals;
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.lib.Constants.LOCK_SUFFIX;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -263,7 +263,7 @@
 
 		ObjectId blobId;
 		try (ObjectInserter ins = bareRepo.newObjectInserter()) {
-			blobId = ins.insert(Constants.OBJ_BLOB, "contents".getBytes(CHARSET));
+			blobId = ins.insert(Constants.OBJ_BLOB, "contents".getBytes(UTF_8));
 			ins.flush();
 		}
 
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/T0003_BasicTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/T0003_BasicTest.java
index e113db1..0207322 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/T0003_BasicTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/T0003_BasicTest.java
@@ -47,7 +47,7 @@
 package org.eclipse.jgit.internal.storage.file;
 
 import static java.nio.charset.StandardCharsets.ISO_8859_1;
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
@@ -368,7 +368,7 @@
 				+ "  email = A U Thor <thor@example.com> # Just an example...\n"
 				+ " name = \"A  Thor \\\\ \\\"\\t \"\n"
 				+ "    defaultCheckInComment = a many line\\ncomment\\n to test\n";
-		assertEquals(expectedStr, new String(IO.readFully(cfg), Constants.CHARSET));
+		assertEquals(expectedStr, new String(IO.readFully(cfg), UTF_8));
 	}
 
 	@Test
@@ -517,7 +517,7 @@
 				4294967295000L, 60));
 		commit.setCommitter(new PersonIdent("Joe Hacker", "joe2@example.com",
 				4294967295000L, 60));
-		commit.setEncoding(CHARSET);
+		commit.setEncoding(UTF_8);
 		commit.setMessage("\u00dcbergeeks");
 		ObjectId cid = insertCommit(commit);
 		assertEquals("4680908112778718f37e686cbebcc912730b3154", cid.name());
@@ -559,7 +559,7 @@
 		final ObjectId treeId;
 		try (ObjectInserter oi = db.newObjectInserter()) {
 			final ObjectId blobId = oi.insert(Constants.OBJ_BLOB,
-					"and this is the data in me\n".getBytes(Constants.CHARSET
+					"and this is the data in me\n".getBytes(UTF_8
 							.name()));
 			TreeFormatter fmt = new TreeFormatter();
 			fmt.append("i-am-a-file", FileMode.REGULAR_FILE, blobId);
@@ -666,9 +666,9 @@
 		ObjectId id2;
 		try (ObjectInserter ins = db.newObjectInserter()) {
 			id1 = ins.insert(
-					Constants.OBJ_BLOB, "contents1".getBytes(Constants.CHARSET));
+					Constants.OBJ_BLOB, "contents1".getBytes(UTF_8));
 			id2 = ins.insert(
-					Constants.OBJ_BLOB, "contents2".getBytes(Constants.CHARSET));
+					Constants.OBJ_BLOB, "contents2".getBytes(UTF_8));
 			ins.flush();
 		}
 
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/WindowCacheGetTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/WindowCacheGetTest.java
index 82ad28e..01426ee 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/WindowCacheGetTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/WindowCacheGetTest.java
@@ -43,6 +43,7 @@
 
 package org.eclipse.jgit.internal.storage.file;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
@@ -77,7 +78,7 @@
 		try (BufferedReader br = new BufferedReader(new InputStreamReader(
 				new FileInputStream(JGitTestUtil
 						.getTestResourceFile("all_packed_objects.txt")),
-				Constants.CHARSET))) {
+				UTF_8))) {
 			String line;
 			while ((line = br.readLine()) != null) {
 				final String[] parts = line.split(" {1,}");
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/pack/GcCommitSelectionTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/pack/GcCommitSelectionTest.java
index d9b58e2..ffb6f4e 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/pack/GcCommitSelectionTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/pack/GcCommitSelectionTest.java
@@ -50,6 +50,7 @@
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 
@@ -243,7 +244,8 @@
 
 		List<RevCommit> commits = Arrays.asList(m0, m1, m2, b3, m4, b5, m6, b7,
 				m8, m9);
-		PackWriterBitmapPreparer preparer = newPeparer(m9, commits);
+		PackWriterBitmapPreparer preparer = newPreparer(
+				Collections.singleton(m9), commits, new PackConfig());
 		List<BitmapCommit> selection = new ArrayList<>(
 				preparer.selectCommits(commits.size(), PackWriter.NONE));
 
@@ -267,15 +269,107 @@
 		return commit.create();
 	}
 
-	private PackWriterBitmapPreparer newPeparer(RevCommit want,
-			List<RevCommit> commits)
-			throws IOException {
+	@Test
+	public void testDistributionOnMultipleBranches() throws Exception {
+		BranchBuilder[] branches = { tr.branch("refs/heads/main"),
+				tr.branch("refs/heads/a"), tr.branch("refs/heads/b"),
+				tr.branch("refs/heads/c") };
+		RevCommit[] tips = new RevCommit[branches.length];
+		List<RevCommit> commits = createHistory(branches, tips);
+		PackConfig config = new PackConfig();
+		config.setBitmapContiguousCommitCount(1);
+		config.setBitmapRecentCommitSpan(5);
+		config.setBitmapDistantCommitSpan(20);
+		config.setBitmapRecentCommitCount(100);
+		Set<RevCommit> wants = new HashSet<>(Arrays.asList(tips));
+		PackWriterBitmapPreparer preparer = newPreparer(wants, commits, config);
+		List<BitmapCommit> selection = new ArrayList<>(
+				preparer.selectCommits(commits.size(), PackWriter.NONE));
+		Set<ObjectId> selected = new HashSet<>();
+		for (BitmapCommit c : selection) {
+			selected.add(c.toObjectId());
+		}
+
+		// Verify that each branch has uniform bitmap selection coverage
+		for (RevCommit c : wants) {
+			assertTrue(selected.contains(c.toObjectId()));
+			int count = 1;
+			int selectedCount = 1;
+			RevCommit parent = c;
+			while (parent.getParentCount() != 0) {
+				parent = parent.getParent(0);
+				count++;
+				if (selected.contains(parent.toObjectId())) {
+					selectedCount++;
+				}
+			}
+			// The selection algorithm prefers merges and will look in the
+			// current range plus the recent commit span before selecting a
+			// commit. Since this history has no merges, we expect the recent
+			// span should have 100/10=10 and distant commit spans should have
+			// 100/25=4 per 100 commit range.
+			int expectedCount = 10 + (count - 100 - 24) / 25;
+			assertTrue(expectedCount <= selectedCount);
+		}
+	}
+
+	private List<RevCommit> createHistory(BranchBuilder[] branches,
+			RevCommit[] tips) throws Exception {
+		/*-
+		 * Create a history like this, where branches a, b and c branch off of the main branch
+		 * at commits 100, 200 and 300, and where commit times move forward alternating between
+		 * branches.
+		 *
+		 * o...o...o...o...o      commits root,m0,m1,...,m399
+		 *      \   \   \
+		 *       \   \   o...     commits branch_c,c300,c301,...,c399
+		 *        \   \
+		 *         \   o...o...   commits branch_b,b200,b201,...,b399
+		 *          \
+		 *           o...o...o... commits branch_a,b100,b101,...,a399
+		 */
+		List<RevCommit> commits = new ArrayList<>();
+		String[] prefixes = { "m", "a", "b", "c" };
+		int branchCount = branches.length;
+		tips[0] = addCommit(commits, branches[0], "root");
+		int counter = 0;
+
+		for (int b = 0; b < branchCount; b++) {
+			for (int i = 0; i < 100; i++, counter++) {
+				for (int j = 0; j <= b; j++) {
+					tips[j] = addCommit(commits, branches[j],
+							prefixes[j] + counter);
+				}
+			}
+			// Create a new branch from current value of the master branch
+			if (b < branchCount - 1) {
+				tips[b + 1] = addCommit(branches[b + 1],
+						"branch_" + prefixes[b + 1], tips[0]);
+			}
+		}
+		return commits;
+	}
+
+	private RevCommit addCommit(List<RevCommit> commits, BranchBuilder bb,
+			String msg, RevCommit... parents) throws Exception {
+		CommitBuilder commit = bb.commit().message(msg).add(msg, msg).tick(1);
+		if (parents.length > 0) {
+			commit.noParents();
+			for (RevCommit parent : parents) {
+				commit.parent(parent);
+			}
+		}
+		RevCommit c = commit.create();
+		commits.add(c);
+		return c;
+	}
+
+	private PackWriterBitmapPreparer newPreparer(Set<RevCommit> wants,
+			List<RevCommit> commits, PackConfig config) throws IOException {
 		List<ObjectToPack> objects = new ArrayList<>(commits.size());
 		for (RevCommit commit : commits) {
 			objects.add(new ObjectToPack(commit, Constants.OBJ_COMMIT));
 		}
-		Set<ObjectId> wants = Collections.singleton((ObjectId) want);
-		PackConfig config = new PackConfig();
 		PackBitmapIndexBuilder builder = new PackBitmapIndexBuilder(objects);
 		return new PackWriterBitmapPreparer(
 				tr.getRepository().newObjectReader(), builder,
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftable/MergedReftableTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftable/MergedReftableTest.java
index ec60bd9..1d11573 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftable/MergedReftableTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftable/MergedReftableTest.java
@@ -80,7 +80,7 @@
 		try (RefCursor rc = mr.seekRef(HEAD)) {
 			assertFalse(rc.next());
 		}
-		try (RefCursor rc = mr.seekRef(R_HEADS)) {
+		try (RefCursor rc = mr.seekRefsWithPrefix(R_HEADS)) {
 			assertFalse(rc.next());
 		}
 	}
@@ -94,7 +94,7 @@
 		try (RefCursor rc = mr.seekRef(HEAD)) {
 			assertFalse(rc.next());
 		}
-		try (RefCursor rc = mr.seekRef(R_HEADS)) {
+		try (RefCursor rc = mr.seekRefsWithPrefix(R_HEADS)) {
 			assertFalse(rc.next());
 		}
 	}
@@ -108,7 +108,7 @@
 		try (RefCursor rc = mr.seekRef(HEAD)) {
 			assertFalse(rc.next());
 		}
-		try (RefCursor rc = mr.seekRef(R_HEADS)) {
+		try (RefCursor rc = mr.seekRefsWithPrefix(R_HEADS)) {
 			assertFalse(rc.next());
 		}
 	}
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftable/ReftableTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftable/ReftableTest.java
index 3ea3061..0ee785c 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftable/ReftableTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftable/ReftableTest.java
@@ -101,7 +101,7 @@
 		try (RefCursor rc = t.seekRef(HEAD)) {
 			assertFalse(rc.next());
 		}
-		try (RefCursor rc = t.seekRef(R_HEADS)) {
+		try (RefCursor rc = t.seekRefsWithPrefix(R_HEADS)) {
 			assertFalse(rc.next());
 		}
 		try (LogCursor rc = t.allLogs()) {
@@ -317,10 +317,10 @@
 	public void namespaceNotFound() throws IOException {
 		Ref exp = ref(MASTER, 1);
 		ReftableReader t = read(write(exp));
-		try (RefCursor rc = t.seekRef("refs/changes/")) {
+		try (RefCursor rc = t.seekRefsWithPrefix("refs/changes/")) {
 			assertFalse(rc.next());
 		}
-		try (RefCursor rc = t.seekRef("refs/tags/")) {
+		try (RefCursor rc = t.seekRefsWithPrefix("refs/tags/")) {
 			assertFalse(rc.next());
 		}
 	}
@@ -332,12 +332,12 @@
 		Ref v1 = tag(V1_0, 3, 4);
 
 		ReftableReader t = read(write(master, next, v1));
-		try (RefCursor rc = t.seekRef("refs/tags/")) {
+		try (RefCursor rc = t.seekRefsWithPrefix("refs/tags/")) {
 			assertTrue(rc.next());
 			assertEquals(V1_0, rc.getRef().getName());
 			assertFalse(rc.next());
 		}
-		try (RefCursor rc = t.seekRef("refs/heads/")) {
+		try (RefCursor rc = t.seekRefsWithPrefix("refs/heads/")) {
 			assertTrue(rc.next());
 			assertEquals(MASTER, rc.getRef().getName());
 
@@ -484,7 +484,7 @@
 		try (RefCursor rc = t.allRefs()) {
 			assertFalse(rc.next());
 		}
-		try (RefCursor rc = t.seekRef("refs/heads/")) {
+		try (RefCursor rc = t.seekRefsWithPrefix("refs/heads/")) {
 			assertFalse(rc.next());
 		}
 		try (LogCursor lc = t.allLogs()) {
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/junit/TestRepositoryTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/junit/TestRepositoryTest.java
index 965899e..b7027f3 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/junit/TestRepositoryTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/junit/TestRepositoryTest.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.junit;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotEquals;
@@ -418,6 +418,6 @@
 		RevObject obj = tr.get(rw.parseTree(treeish), path);
 		assertSame(RevBlob.class, obj.getClass());
 		ObjectLoader loader = rw.getObjectReader().open(obj);
-		return new String(loader.getCachedBytes(), CHARSET);
+		return new String(loader.getCachedBytes(), UTF_8);
 	}
 }
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/HugeCommitMessageTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/HugeCommitMessageTest.java
new file mode 100644
index 0000000..4193c4b
--- /dev/null
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/HugeCommitMessageTest.java
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2018, Thomas Wolf <thomas.wolf@paranor.ch>
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.eclipse.jgit.lib;
+
+import static org.junit.Assert.assertTrue;
+
+import java.util.List;
+
+import org.eclipse.jgit.api.Git;
+import org.eclipse.jgit.junit.RepositoryTestCase;
+import org.eclipse.jgit.revwalk.RevCommit;
+import org.eclipse.jgit.storage.file.WindowCacheConfig;
+import org.eclipse.jgit.storage.pack.PackConfig;
+import org.junit.Test;
+
+public class HugeCommitMessageTest extends RepositoryTestCase {
+
+	private static final int HUGE_SIZE = Math.max(15 * WindowCacheConfig.MB,
+			PackConfig.DEFAULT_BIG_FILE_THRESHOLD + WindowCacheConfig.MB);
+	// Larger than the 5MB fallback limit in RevWalk.getCachedBytes(RevObject
+	// obj, ObjectLoader ldr), and also larger than the default
+	// streamFileThreshold.
+
+	@Test
+	public void testHugeCommitMessage() throws Exception {
+		try (Git git = new Git(db)) {
+			writeTrashFile("foo", "foo");
+			git.add().addFilepattern("foo").call();
+			WindowCacheConfig wc = new WindowCacheConfig();
+			wc.setStreamFileThreshold(HUGE_SIZE + WindowCacheConfig.MB);
+			wc.install();
+			RevCommit commit = git.commit()
+					.setMessage(insanelyHugeCommitMessage()).call();
+			Ref master = db.findRef("master");
+			List<Ref> actual = git.branchList().setContains(commit.getName())
+					.call();
+			assertTrue("Should be contained in branch master",
+					actual.contains(master));
+		}
+	}
+
+	private String insanelyHugeCommitMessage() {
+		final String oneLine = "012345678901234567890123456789012345678901234567890123456789\n";
+		StringBuilder b = new StringBuilder(HUGE_SIZE + oneLine.length());
+		// Give the message a real header; otherwise even writing the reflog
+		// message may run into troubles because RevCommit.getShortMessage()
+		// will return the whole message.
+		b.append("An insanely huge commit message\n\n");
+		while (b.length() < HUGE_SIZE) {
+			b.append(oneLine);
+		}
+		return b.toString();
+	}
+
+}
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ObjectCheckerTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ObjectCheckerTest.java
index 1ab36f0..531c918 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ObjectCheckerTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ObjectCheckerTest.java
@@ -45,7 +45,7 @@
 package org.eclipse.jgit.lib;
 
 import static java.lang.Integer.valueOf;
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.junit.JGitTestUtil.concat;
 import static org.eclipse.jgit.lib.Constants.OBJECT_ID_LENGTH;
 import static org.eclipse.jgit.lib.Constants.OBJ_BAD;
@@ -1560,7 +1560,7 @@
 		StringBuilder b = new StringBuilder();
 		entry(b, "100644 A");
 		entry(b, "100644 a");
-		byte[] data = b.toString().getBytes(CHARSET);
+		byte[] data = b.toString().getBytes(UTF_8);
 		checker.setSafeForWindows(true);
 		assertCorrupt("duplicate entry names", OBJ_TREE, data);
 		assertSkipListAccepts(OBJ_TREE, data);
@@ -1574,7 +1574,7 @@
 		StringBuilder b = new StringBuilder();
 		entry(b, "100644 A");
 		entry(b, "100644 a");
-		byte[] data = b.toString().getBytes(CHARSET);
+		byte[] data = b.toString().getBytes(UTF_8);
 		checker.setSafeForMacOS(true);
 		assertCorrupt("duplicate entry names", OBJ_TREE, data);
 		assertSkipListAccepts(OBJ_TREE, data);
@@ -1588,7 +1588,7 @@
 		StringBuilder b = new StringBuilder();
 		entry(b, "100644 \u0065\u0301");
 		entry(b, "100644 \u00e9");
-		byte[] data = b.toString().getBytes(CHARSET);
+		byte[] data = b.toString().getBytes(UTF_8);
 		checker.setSafeForMacOS(true);
 		assertCorrupt("duplicate entry names", OBJ_TREE, data);
 		assertSkipListAccepts(OBJ_TREE, data);
@@ -1602,7 +1602,7 @@
 		StringBuilder b = new StringBuilder();
 		entry(b, "100644 A");
 		checker.setSafeForMacOS(true);
-		checker.checkTree(b.toString().getBytes(CHARSET));
+		checker.checkTree(b.toString().getBytes(UTF_8));
 	}
 
 	@Test
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/RacyGitTests.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/RacyGitTests.java
index 8d9ccab..3542dfa 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/RacyGitTests.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/RacyGitTests.java
@@ -45,6 +45,7 @@
 import static java.lang.Long.valueOf;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
+import static org.junit.Assume.assumeTrue;
 
 import java.io.File;
 import java.io.FileOutputStream;
@@ -157,10 +158,13 @@
 		// Remember the last modTime of index file. All modifications times of
 		// further modification are translated to this value so it looks that
 		// files have been modified in the same time slot as the index file
-		modTimes.add(Long.valueOf(db.getIndexFile().lastModified()));
+		long indexMod = db.getIndexFile().lastModified();
+		modTimes.add(Long.valueOf(indexMod));
 
 		// modify one file
-		addToWorkDir("a", "a2");
+		long aMod = addToWorkDir("a", "a2").lastModified();
+		assumeTrue(aMod == indexMod);
+
 		// now update the index the index. 'a' has to be racily clean -- because
 		// it's modification time is exactly the same as the previous index file
 		// mod time.
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/RefTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/RefTest.java
index 2481e64..a42027b 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/RefTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/RefTest.java
@@ -58,7 +58,7 @@
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.util.List;
-import java.util.Map;
+import java.util.Optional;
 import java.util.TreeSet;
 
 import org.eclipse.jgit.lib.Ref.Storage;
@@ -148,17 +148,22 @@
 		ObjectId r = db.resolve("refs/remotes/origin/HEAD");
 		assertEquals(masterId, r);
 
-		Map<String, Ref> allRefs = db.getAllRefs();
-		Ref refHEAD = allRefs.get("refs/remotes/origin/HEAD");
-		assertNotNull(refHEAD);
-		assertEquals(masterId, refHEAD.getObjectId());
-		assertFalse(refHEAD.isPeeled());
-		assertNull(refHEAD.getPeeledObjectId());
+		List<Ref> allRefs = db.getRefDatabase().getRefs();
+		Optional<Ref> refHEAD = allRefs.stream()
+				.filter(ref -> ref.getName().equals("refs/remotes/origin/HEAD"))
+				.findAny();
+		assertTrue(refHEAD.isPresent());
+		assertEquals(masterId, refHEAD.get().getObjectId());
+		assertFalse(refHEAD.get().isPeeled());
+		assertNull(refHEAD.get().getPeeledObjectId());
 
-		Ref refmaster = allRefs.get("refs/remotes/origin/master");
-		assertEquals(masterId, refmaster.getObjectId());
-		assertFalse(refmaster.isPeeled());
-		assertNull(refmaster.getPeeledObjectId());
+		Optional<Ref> refmaster = allRefs.stream().filter(
+				ref -> ref.getName().equals("refs/remotes/origin/master"))
+				.findAny();
+		assertTrue(refmaster.isPresent());
+		assertEquals(masterId, refmaster.get().getObjectId());
+		assertFalse(refmaster.get().isPeeled());
+		assertNull(refmaster.get().getPeeledObjectId());
 	}
 
 	@Test
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/merge/CrissCrossMergeTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/merge/CrissCrossMergeTest.java
index aaa08a9..a67c750 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/merge/CrissCrossMergeTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/merge/CrissCrossMergeTest.java
@@ -42,6 +42,8 @@
  */
 package org.eclipse.jgit.merge;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -881,7 +883,7 @@
 		StringBuilder result = new StringBuilder();
 		ObjectReader or = r.newObjectReader();
 		try (BufferedReader br = new BufferedReader(
-				new InputStreamReader(or.open(blobId).openStream()))) {
+				new InputStreamReader(or.open(blobId).openStream(), UTF_8))) {
 			String line;
 			boolean first = true;
 			while ((line = br.readLine()) != null) {
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/merge/MergerTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/merge/MergerTest.java
index 58093a3..8f12dd7 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/merge/MergerTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/merge/MergerTest.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.merge;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.lib.Constants.OBJ_BLOB;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -60,6 +60,7 @@
 import org.eclipse.jgit.api.Git;
 import org.eclipse.jgit.api.MergeResult;
 import org.eclipse.jgit.api.MergeResult.MergeStatus;
+import org.eclipse.jgit.api.RebaseResult;
 import org.eclipse.jgit.api.errors.CheckoutConflictException;
 import org.eclipse.jgit.api.errors.GitAPIException;
 import org.eclipse.jgit.api.errors.JGitInternalException;
@@ -428,6 +429,44 @@
 				indexState(CONTENT));
 	}
 
+	@Theory
+	public void rebaseWithCrlfAutoCrlfTrue(MergeStrategy strategy)
+			throws IOException, GitAPIException {
+		Git git = Git.wrap(db);
+		db.getConfig().setString("core", null, "autocrlf", "true");
+		db.getConfig().save();
+		writeTrashFile("crlf.txt", "line 1\r\nline 2\r\nline 3\r\n");
+		git.add().addFilepattern("crlf.txt").call();
+		RevCommit first = git.commit().setMessage("base").call();
+
+		git.checkout().setCreateBranch(true).setStartPoint(first)
+				.setName("brancha").call();
+
+		File testFile = writeTrashFile("crlf.txt",
+				"line 1\r\nmodified line\r\nline 3\r\n");
+		git.add().addFilepattern("crlf.txt").call();
+		git.commit().setMessage("on brancha").call();
+
+		git.checkout().setName("master").call();
+		File otherFile = writeTrashFile("otherfile.txt", "a line\r\n");
+		git.add().addFilepattern("otherfile.txt").call();
+		git.commit().setMessage("on master").call();
+
+		git.checkout().setName("brancha").call();
+		checkFile(testFile, "line 1\r\nmodified line\r\nline 3\r\n");
+		assertFalse(otherFile.exists());
+
+		RebaseResult rebaseResult = git.rebase().setStrategy(strategy)
+				.setUpstream(db.resolve("master")).call();
+		assertEquals(RebaseResult.Status.OK, rebaseResult.getStatus());
+		checkFile(testFile, "line 1\r\nmodified line\r\nline 3\r\n");
+		checkFile(otherFile, "a line\r\n");
+		assertEquals(
+				"[crlf.txt, mode:100644, content:line 1\nmodified line\nline 3\n]"
+						+ "[otherfile.txt, mode:100644, content:a line\n]",
+				indexState(CONTENT));
+	}
+
 	/**
 	 * Merging two equal subtrees when the index does not contain any file in
 	 * that subtree should lead to a merged state.
@@ -754,7 +793,7 @@
 		}
 		binary[50] = '\0';
 
-		writeTrashFile("file", new String(binary, CHARSET));
+		writeTrashFile("file", new String(binary, UTF_8));
 		git.add().addFilepattern("file").call();
 		RevCommit first = git.commit().setMessage("added file").call();
 
@@ -762,7 +801,7 @@
 		int idx = LINELEN * 1200 + 1;
 		byte save = binary[idx];
 		binary[idx] = '@';
-		writeTrashFile("file", new String(binary, CHARSET));
+		writeTrashFile("file", new String(binary, UTF_8));
 
 		binary[idx] = save;
 		git.add().addFilepattern("file").call();
@@ -771,7 +810,7 @@
 
 		git.checkout().setCreateBranch(true).setStartPoint(first).setName("side").call();
 		binary[LINELEN * 1500 + 1] = '!';
-		writeTrashFile("file", new String(binary, CHARSET));
+		writeTrashFile("file", new String(binary, UTF_8));
 		git.add().addFilepattern("file").call();
 		RevCommit sideCommit = git.commit().setAll(true)
 			.setMessage("modified file l 1500").call();
@@ -933,7 +972,7 @@
 			merger.getMergeResults().get("file");
 			try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
 				fmt.formatMerge(out, merger.getMergeResults().get("file"),
-						"BASE", "OURS", "THEIRS", CHARSET.name());
+						"BASE", "OURS", "THEIRS", UTF_8.name());
 				String expected = "<<<<<<< OURS\n"
 						+ "1master\n"
 						+ "=======\n"
@@ -941,7 +980,7 @@
 						+ ">>>>>>> THEIRS\n"
 						+ "2\n"
 						+ "3";
-				assertEquals(expected, new String(out.toByteArray(), CHARSET));
+				assertEquals(expected, new String(out.toByteArray(), UTF_8));
 			}
 		}
 	}
@@ -1328,6 +1367,7 @@
 		if (obj == null) {
 			return null;
 		}
-		return new String(rw.getObjectReader().open(obj, OBJ_BLOB).getBytes(), CHARSET);
+		return new String(rw.getObjectReader().open(obj, OBJ_BLOB).getBytes(),
+				UTF_8);
 	}
 }
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/patch/GetTextTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/patch/GetTextTest.java
index 7b5868a..e383f36 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/patch/GetTextTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/patch/GetTextTest.java
@@ -44,7 +44,7 @@
 package org.eclipse.jgit.patch;
 
 import static java.nio.charset.StandardCharsets.ISO_8859_1;
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
@@ -83,7 +83,7 @@
 	@Test
 	public void testGetText_Convert() throws IOException {
 		final Charset csOld = ISO_8859_1;
-		final Charset csNew = CHARSET;
+		final Charset csNew = UTF_8;
 		final Patch p = parseTestPatchFile();
 		assertTrue(p.getErrors().isEmpty());
 		assertEquals(1, p.getFiles().size());
@@ -103,7 +103,7 @@
 	@Test
 	public void testGetText_DiffCc() throws IOException {
 		final Charset csOld = ISO_8859_1;
-		final Charset csNew = CHARSET;
+		final Charset csNew = UTF_8;
 		final Patch p = parseTestPatchFile();
 		assertTrue(p.getErrors().isEmpty());
 		assertEquals(1, p.getFiles().size());
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevCommitParseTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevCommitParseTest.java
index cfefac3..b814984 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevCommitParseTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevCommitParseTest.java
@@ -44,7 +44,7 @@
 package org.eclipse.jgit.revwalk;
 
 import static java.nio.charset.StandardCharsets.ISO_8859_1;
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
@@ -114,7 +114,7 @@
 		assertNull(c.getTree());
 		assertNull(c.parents);
 
-		c.parseCanonical(rw, body.toString().getBytes(CHARSET));
+		c.parseCanonical(rw, body.toString().getBytes(UTF_8));
 		assertNotNull(c.getTree());
 		assertEquals(treeId, c.getTree().getId());
 		assertSame(rw.lookupTree(treeId), c.getTree());
@@ -148,7 +148,7 @@
 
 		final RevCommit c;
 		c = new RevCommit(id("9473095c4cb2f12aefe1db8a355fe3fafba42f67"));
-		c.parseCanonical(new RevWalk(db), b.toString().getBytes(CHARSET));
+		c.parseCanonical(new RevWalk(db), b.toString().getBytes(UTF_8));
 		return c;
 	}
 
@@ -161,7 +161,7 @@
 
 		final RevCommit c;
 		c = new RevCommit(id("9473095c4cb2f12aefe1db8a355fe3fafba42f67"));
-		c.parseCanonical(new RevWalk(db), b.toString().getBytes(CHARSET));
+		c.parseCanonical(new RevWalk(db), b.toString().getBytes(UTF_8));
 
 		assertEquals("", c.getFullMessage());
 		assertEquals("", c.getShortMessage());
@@ -176,7 +176,7 @@
 
 		final RevCommit c;
 		c = new RevCommit(id("9473095c4cb2f12aefe1db8a355fe3fafba42f67"));
-		c.parseCanonical(new RevWalk(db), b.toString().getBytes(CHARSET));
+		c.parseCanonical(new RevWalk(db), b.toString().getBytes(UTF_8));
 
 		assertEquals(new PersonIdent("", "a_u_thor@example.com", 1218123387000l, 7), c.getAuthorIdent());
 		assertEquals(new PersonIdent("", "", 1218123390000l, -5), c.getCommitterIdent());
@@ -185,18 +185,18 @@
 	@Test
 	public void testParse_implicit_UTF8_encoded() throws Exception {
 		final ByteArrayOutputStream b = new ByteArrayOutputStream();
-		b.write("tree 9788669ad918b6fcce64af8882fc9a81cb6aba67\n".getBytes(CHARSET));
-		b.write("author F\u00f6r fattare <a_u_thor@example.com> 1218123387 +0700\n".getBytes(CHARSET));
-		b.write("committer C O. Miter <c@example.com> 1218123390 -0500\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("Sm\u00f6rg\u00e5sbord\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("\u304d\u308c\u3044\n".getBytes(CHARSET));
+		b.write("tree 9788669ad918b6fcce64af8882fc9a81cb6aba67\n".getBytes(UTF_8));
+		b.write("author F\u00f6r fattare <a_u_thor@example.com> 1218123387 +0700\n".getBytes(UTF_8));
+		b.write("committer C O. Miter <c@example.com> 1218123390 -0500\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("Sm\u00f6rg\u00e5sbord\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("\u304d\u308c\u3044\n".getBytes(UTF_8));
 		final RevCommit c;
 		c = new RevCommit(id("9473095c4cb2f12aefe1db8a355fe3fafba42f67")); // bogus id
 		c.parseCanonical(new RevWalk(db), b.toByteArray());
 
-		assertSame(Constants.CHARSET, c.getEncoding());
+		assertSame(UTF_8, c.getEncoding());
 		assertEquals("F\u00f6r fattare", c.getAuthorIdent().getName());
 		assertEquals("Sm\u00f6rg\u00e5sbord", c.getShortMessage());
 		assertEquals("Sm\u00f6rg\u00e5sbord\n\n\u304d\u308c\u3044\n", c.getFullMessage());
@@ -205,18 +205,18 @@
 	@Test
 	public void testParse_implicit_mixed_encoded() throws Exception {
 		final ByteArrayOutputStream b = new ByteArrayOutputStream();
-		b.write("tree 9788669ad918b6fcce64af8882fc9a81cb6aba67\n".getBytes(CHARSET));
+		b.write("tree 9788669ad918b6fcce64af8882fc9a81cb6aba67\n".getBytes(UTF_8));
 		b.write("author F\u00f6r fattare <a_u_thor@example.com> 1218123387 +0700\n".getBytes(ISO_8859_1));
-		b.write("committer C O. Miter <c@example.com> 1218123390 -0500\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("Sm\u00f6rg\u00e5sbord\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("\u304d\u308c\u3044\n".getBytes(CHARSET));
+		b.write("committer C O. Miter <c@example.com> 1218123390 -0500\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("Sm\u00f6rg\u00e5sbord\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("\u304d\u308c\u3044\n".getBytes(UTF_8));
 		final RevCommit c;
 		c = new RevCommit(id("9473095c4cb2f12aefe1db8a355fe3fafba42f67")); // bogus id
 		c.parseCanonical(new RevWalk(db), b.toByteArray());
 
-		assertSame(Constants.CHARSET, c.getEncoding());
+		assertSame(UTF_8, c.getEncoding());
 		assertEquals("F\u00f6r fattare", c.getAuthorIdent().getName());
 		assertEquals("Sm\u00f6rg\u00e5sbord", c.getShortMessage());
 		assertEquals("Sm\u00f6rg\u00e5sbord\n\n\u304d\u308c\u3044\n", c.getFullMessage());
@@ -260,14 +260,14 @@
 	@Test
 	public void testParse_explicit_bad_encoded() throws Exception {
 		final ByteArrayOutputStream b = new ByteArrayOutputStream();
-		b.write("tree 9788669ad918b6fcce64af8882fc9a81cb6aba67\n".getBytes(CHARSET));
+		b.write("tree 9788669ad918b6fcce64af8882fc9a81cb6aba67\n".getBytes(UTF_8));
 		b.write("author F\u00f6r fattare <a_u_thor@example.com> 1218123387 +0700\n".getBytes(ISO_8859_1));
-		b.write("committer C O. Miter <c@example.com> 1218123390 -0500\n".getBytes(CHARSET));
-		b.write("encoding EUC-JP\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("\u304d\u308c\u3044\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("Hi\n".getBytes(CHARSET));
+		b.write("committer C O. Miter <c@example.com> 1218123390 -0500\n".getBytes(UTF_8));
+		b.write("encoding EUC-JP\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("\u304d\u308c\u3044\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("Hi\n".getBytes(UTF_8));
 		final RevCommit c;
 		c = new RevCommit(id("9473095c4cb2f12aefe1db8a355fe3fafba42f67")); // bogus id
 		c.parseCanonical(new RevWalk(db), b.toByteArray());
@@ -291,14 +291,14 @@
 	@Test
 	public void testParse_explicit_bad_encoded2() throws Exception {
 		final ByteArrayOutputStream b = new ByteArrayOutputStream();
-		b.write("tree 9788669ad918b6fcce64af8882fc9a81cb6aba67\n".getBytes(CHARSET));
-		b.write("author F\u00f6r fattare <a_u_thor@example.com> 1218123387 +0700\n".getBytes(CHARSET));
-		b.write("committer C O. Miter <c@example.com> 1218123390 -0500\n".getBytes(CHARSET));
-		b.write("encoding ISO-8859-1\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("\u304d\u308c\u3044\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("Hi\n".getBytes(CHARSET));
+		b.write("tree 9788669ad918b6fcce64af8882fc9a81cb6aba67\n".getBytes(UTF_8));
+		b.write("author F\u00f6r fattare <a_u_thor@example.com> 1218123387 +0700\n".getBytes(UTF_8));
+		b.write("committer C O. Miter <c@example.com> 1218123390 -0500\n".getBytes(UTF_8));
+		b.write("encoding ISO-8859-1\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("\u304d\u308c\u3044\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("Hi\n".getBytes(UTF_8));
 		final RevCommit c;
 		c = new RevCommit(id("9473095c4cb2f12aefe1db8a355fe3fafba42f67")); // bogus id
 		c.parseCanonical(new RevWalk(db), b.toByteArray());
@@ -313,13 +313,13 @@
 	public void testParse_incorrectUtf8Name() throws Exception {
 		ByteArrayOutputStream b = new ByteArrayOutputStream();
 		b.write("tree 9788669ad918b6fcce64af8882fc9a81cb6aba67\n"
-				.getBytes(CHARSET));
-		b.write("author au <a@example.com> 1218123387 +0700\n".getBytes(CHARSET));
+				.getBytes(UTF_8));
+		b.write("author au <a@example.com> 1218123387 +0700\n".getBytes(UTF_8));
 		b.write("committer co <c@example.com> 1218123390 -0500\n"
-				.getBytes(CHARSET));
-		b.write("encoding 'utf8'\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("Sm\u00f6rg\u00e5sbord\n".getBytes(CHARSET));
+				.getBytes(UTF_8));
+		b.write("encoding 'utf8'\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("Sm\u00f6rg\u00e5sbord\n".getBytes(UTF_8));
 
 		RevCommit c = new RevCommit(
 				id("9473095c4cb2f12aefe1db8a355fe3fafba42f67"));
@@ -338,12 +338,12 @@
 	@Test
 	public void testParse_illegalEncoding() throws Exception {
 		ByteArrayOutputStream b = new ByteArrayOutputStream();
-		b.write("tree 9788669ad918b6fcce64af8882fc9a81cb6aba67\n".getBytes(CHARSET));
-		b.write("author au <a@example.com> 1218123387 +0700\n".getBytes(CHARSET));
-		b.write("committer co <c@example.com> 1218123390 -0500\n".getBytes(CHARSET));
-		b.write("encoding utf-8logoutputencoding=gbk\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("message\n".getBytes(CHARSET));
+		b.write("tree 9788669ad918b6fcce64af8882fc9a81cb6aba67\n".getBytes(UTF_8));
+		b.write("author au <a@example.com> 1218123387 +0700\n".getBytes(UTF_8));
+		b.write("committer co <c@example.com> 1218123390 -0500\n".getBytes(UTF_8));
+		b.write("encoding utf-8logoutputencoding=gbk\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("message\n".getBytes(UTF_8));
 
 		RevCommit c = new RevCommit(
 				id("9473095c4cb2f12aefe1db8a355fe3fafba42f67"));
@@ -365,12 +365,12 @@
 	@Test
 	public void testParse_unsupportedEncoding() throws Exception {
 		ByteArrayOutputStream b = new ByteArrayOutputStream();
-		b.write("tree 9788669ad918b6fcce64af8882fc9a81cb6aba67\n".getBytes(CHARSET));
-		b.write("author au <a@example.com> 1218123387 +0700\n".getBytes(CHARSET));
-		b.write("committer co <c@example.com> 1218123390 -0500\n".getBytes(CHARSET));
-		b.write("encoding it_IT.UTF8\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("message\n".getBytes(CHARSET));
+		b.write("tree 9788669ad918b6fcce64af8882fc9a81cb6aba67\n".getBytes(UTF_8));
+		b.write("author au <a@example.com> 1218123387 +0700\n".getBytes(UTF_8));
+		b.write("committer co <c@example.com> 1218123390 -0500\n".getBytes(UTF_8));
+		b.write("encoding it_IT.UTF8\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("message\n".getBytes(UTF_8));
 
 		RevCommit c = new RevCommit(
 				id("9473095c4cb2f12aefe1db8a355fe3fafba42f67"));
@@ -486,4 +486,36 @@
 	private static ObjectId id(String str) {
 		return ObjectId.fromString(str);
 	}
+
+	@Test
+	public void testParse_gpgSig() throws Exception {
+		String commit = "tree e3a1035abd2b319bb01e57d69b0ba6cab289297e\n" +
+		"parent 54e895b87c0768d2317a2b17062e3ad9f76a8105\n" +
+		"committer A U Thor <author@xample.com 1528968566 +0200\n" +
+		"gpgsig -----BEGIN PGP SIGNATURE-----\n" +
+		" \n" +
+		" wsBcBAABCAAQBQJbGB4pCRBK7hj4Ov3rIwAAdHIIAENrvz23867ZgqrmyPemBEZP\n" +
+		" U24B1Tlq/DWvce2buaxmbNQngKZ0pv2s8VMc11916WfTIC9EKvioatmpjduWvhqj\n" +
+		" znQTFyiMor30pyYsfrqFuQZvqBW01o8GEWqLg8zjf9Rf0R3LlOEw86aT8CdHRlm6\n" +
+		" wlb22xb8qoX4RB+LYfz7MhK5F+yLOPXZdJnAVbuyoMGRnDpwdzjL5Hj671+XJxN5\n" +
+		" SasRdhxkkfw/ZnHxaKEc4juMz8Nziz27elRwhOQqlTYoXNJnsV//wy5Losd7aKi1\n" +
+		" xXXyUpndEOmT0CIcKHrN/kbYoVL28OJaxoBuva3WYQaRrzEe3X02NMxZe9gkSqA=\n" +
+		" =TClh\n" +
+		" -----END PGP SIGNATURE-----\n" +
+		"some other header\n\n" +
+		"commit message";
+
+		final RevCommit c;
+		c = new RevCommit(id("9473095c4cb2f12aefe1db8a355fe3fafba42f67"));
+		c.parseCanonical(new RevWalk(db), commit.getBytes(UTF_8));
+		String gpgSig = new String(c.getRawGpgSignature(), UTF_8);
+		assertTrue(gpgSig.startsWith("-----BEGIN"));
+		assertTrue(gpgSig.endsWith("END PGP SIGNATURE-----"));
+	}
+
+	@Test
+	public void testParse_NoGpgSig() throws Exception {
+		final RevCommit c = create("a message");
+		assertNull(c.getRawGpgSignature());
+	}
 }
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevObjectTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevObjectTest.java
index 8e389ae..4969305 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevObjectTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevObjectTest.java
@@ -144,13 +144,13 @@
 		final RevCommit a = commit();
 		final RevFlag flag1 = rw.newFlag("flag1");
 		final RevFlag flag2 = rw.newFlag("flag2");
-		assertEquals(0, a.flags);
+		assertEquals(RevWalk.PARSED, a.flags);
 
 		a.add(flag1);
-		assertEquals(flag1.mask, a.flags);
+		assertEquals(RevWalk.PARSED | flag1.mask, a.flags);
 
 		a.add(flag2);
-		assertEquals(flag1.mask | flag2.mask, a.flags);
+		assertEquals(RevWalk.PARSED | flag1.mask | flag2.mask, a.flags);
 	}
 
 	@Test
@@ -162,10 +162,10 @@
 		s.add(flag1);
 		s.add(flag2);
 
-		assertEquals(0, a.flags);
+		assertEquals(RevWalk.PARSED, a.flags);
 
 		a.add(s);
-		assertEquals(flag1.mask | flag2.mask, a.flags);
+		assertEquals(RevWalk.PARSED | flag1.mask | flag2.mask, a.flags);
 	}
 
 	@Test
@@ -175,9 +175,9 @@
 		final RevFlag flag2 = rw.newFlag("flag2");
 		a.add(flag1);
 		a.add(flag2);
-		assertEquals(flag1.mask | flag2.mask, a.flags);
+		assertEquals(RevWalk.PARSED | flag1.mask | flag2.mask, a.flags);
 		a.remove(flag2);
-		assertEquals(flag1.mask, a.flags);
+		assertEquals(RevWalk.PARSED | flag1.mask, a.flags);
 	}
 
 	@Test
@@ -191,8 +191,8 @@
 		s.add(flag2);
 		a.add(flag3);
 		a.add(s);
-		assertEquals(flag1.mask | flag2.mask | flag3.mask, a.flags);
+		assertEquals(RevWalk.PARSED | flag1.mask | flag2.mask | flag3.mask, a.flags);
 		a.remove(s);
-		assertEquals(flag3.mask, a.flags);
+		assertEquals(RevWalk.PARSED | flag3.mask, a.flags);
 	}
 }
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevTagParseTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevTagParseTest.java
index e11cef7..1b45473 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevTagParseTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevTagParseTest.java
@@ -44,7 +44,7 @@
 package org.eclipse.jgit.revwalk;
 
 import static java.nio.charset.StandardCharsets.ISO_8859_1;
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
@@ -98,7 +98,7 @@
 		assertNull(c.getObject());
 		assertNull(c.getTagName());
 
-		c.parseCanonical(rw, b.toString().getBytes(CHARSET));
+		c.parseCanonical(rw, b.toString().getBytes(UTF_8));
 		assertNotNull(c.getObject());
 		assertEquals(id, c.getObject().getId());
 		assertSame(rw.lookupAny(id, typeCode), c.getObject());
@@ -141,7 +141,7 @@
 		assertNull(c.getObject());
 		assertNull(c.getTagName());
 
-		c.parseCanonical(rw, body.toString().getBytes(CHARSET));
+		c.parseCanonical(rw, body.toString().getBytes(UTF_8));
 		assertNotNull(c.getObject());
 		assertEquals(treeId, c.getObject().getId());
 		assertSame(rw.lookupTree(treeId), c.getObject());
@@ -189,7 +189,7 @@
 		assertNull(c.getObject());
 		assertNull(c.getTagName());
 
-		c.parseCanonical(rw, body.toString().getBytes(CHARSET));
+		c.parseCanonical(rw, body.toString().getBytes(UTF_8));
 		assertNotNull(c.getObject());
 		assertEquals(treeId, c.getObject().getId());
 		assertSame(rw.lookupTree(treeId), c.getObject());
@@ -213,7 +213,7 @@
 
 		final RevTag c;
 		c = new RevTag(id("9473095c4cb2f12aefe1db8a355fe3fafba42f67"));
-		c.parseCanonical(new RevWalk(db), b.toString().getBytes(CHARSET));
+		c.parseCanonical(new RevWalk(db), b.toString().getBytes(UTF_8));
 		return c;
 	}
 
@@ -221,17 +221,17 @@
 	public void testParse_implicit_UTF8_encoded() throws Exception {
 		final ByteArrayOutputStream b = new ByteArrayOutputStream();
 		b.write("object 9788669ad918b6fcce64af8882fc9a81cb6aba67\n"
-				.getBytes(CHARSET));
-		b.write("type tree\n".getBytes(CHARSET));
-		b.write("tag v1.2.3.4.5\n".getBytes(CHARSET));
+				.getBytes(UTF_8));
+		b.write("type tree\n".getBytes(UTF_8));
+		b.write("tag v1.2.3.4.5\n".getBytes(UTF_8));
 
 		b
 				.write("tagger F\u00f6r fattare <a_u_thor@example.com> 1218123387 +0700\n"
-						.getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("Sm\u00f6rg\u00e5sbord\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("\u304d\u308c\u3044\n".getBytes(CHARSET));
+						.getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("Sm\u00f6rg\u00e5sbord\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("\u304d\u308c\u3044\n".getBytes(UTF_8));
 		final RevTag c;
 		c = new RevTag(id("9473095c4cb2f12aefe1db8a355fe3fafba42f67"));
 		c.parseCanonical(new RevWalk(db), b.toByteArray());
@@ -246,15 +246,15 @@
 	public void testParse_implicit_mixed_encoded() throws Exception {
 		final ByteArrayOutputStream b = new ByteArrayOutputStream();
 		b.write("object 9788669ad918b6fcce64af8882fc9a81cb6aba67\n"
-				.getBytes(CHARSET));
-		b.write("type tree\n".getBytes(CHARSET));
-		b.write("tag v1.2.3.4.5\n".getBytes(CHARSET));
+				.getBytes(UTF_8));
+		b.write("type tree\n".getBytes(UTF_8));
+		b.write("tag v1.2.3.4.5\n".getBytes(UTF_8));
 		b.write("tagger F\u00f6r fattare <a_u_thor@example.com> 1218123387 +0700\n"
 				.getBytes(ISO_8859_1));
-		b.write("\n".getBytes(CHARSET));
-		b.write("Sm\u00f6rg\u00e5sbord\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("\u304d\u308c\u3044\n".getBytes(CHARSET));
+		b.write("\n".getBytes(UTF_8));
+		b.write("Sm\u00f6rg\u00e5sbord\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("\u304d\u308c\u3044\n".getBytes(UTF_8));
 		final RevTag c;
 		c = new RevTag(id("9473095c4cb2f12aefe1db8a355fe3fafba42f67"));
 		c.parseCanonical(new RevWalk(db), b.toByteArray());
@@ -307,17 +307,17 @@
 	public void testParse_explicit_bad_encoded() throws Exception {
 		final ByteArrayOutputStream b = new ByteArrayOutputStream();
 		b.write("object 9788669ad918b6fcce64af8882fc9a81cb6aba67\n"
-				.getBytes(CHARSET));
-		b.write("type tree\n".getBytes(CHARSET));
-		b.write("tag v1.2.3.4.5\n".getBytes(CHARSET));
+				.getBytes(UTF_8));
+		b.write("type tree\n".getBytes(UTF_8));
+		b.write("tag v1.2.3.4.5\n".getBytes(UTF_8));
 		b
 				.write("tagger F\u00f6r fattare <a_u_thor@example.com> 1218123387 +0700\n"
 						.getBytes(ISO_8859_1));
-		b.write("encoding EUC-JP\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("\u304d\u308c\u3044\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("Hi\n".getBytes(CHARSET));
+		b.write("encoding EUC-JP\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("\u304d\u308c\u3044\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("Hi\n".getBytes(UTF_8));
 		final RevTag c;
 		c = new RevTag(id("9473095c4cb2f12aefe1db8a355fe3fafba42f67"));
 		c.parseCanonical(new RevWalk(db), b.toByteArray());
@@ -342,17 +342,17 @@
 	public void testParse_explicit_bad_encoded2() throws Exception {
 		final ByteArrayOutputStream b = new ByteArrayOutputStream();
 		b.write("object 9788669ad918b6fcce64af8882fc9a81cb6aba67\n"
-				.getBytes(CHARSET));
-		b.write("type tree\n".getBytes(CHARSET));
-		b.write("tag v1.2.3.4.5\n".getBytes(CHARSET));
+				.getBytes(UTF_8));
+		b.write("type tree\n".getBytes(UTF_8));
+		b.write("tag v1.2.3.4.5\n".getBytes(UTF_8));
 		b
 				.write("tagger F\u00f6r fattare <a_u_thor@example.com> 1218123387 +0700\n"
-						.getBytes(CHARSET));
-		b.write("encoding ISO-8859-1\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("\u304d\u308c\u3044\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("Hi\n".getBytes(CHARSET));
+						.getBytes(UTF_8));
+		b.write("encoding ISO-8859-1\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("\u304d\u308c\u3044\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("Hi\n".getBytes(UTF_8));
 		final RevTag c;
 		c = new RevTag(id("9473095c4cb2f12aefe1db8a355fe3fafba42f67"));
 		c.parseCanonical(new RevWalk(db), b.toByteArray());
@@ -365,13 +365,13 @@
 	@Test
 	public void testParse_illegalEncoding() throws Exception {
 		ByteArrayOutputStream b = new ByteArrayOutputStream();
-		b.write("object 9788669ad918b6fcce64af8882fc9a81cb6aba67\n".getBytes(CHARSET));
-		b.write("type tree\n".getBytes(CHARSET));
-		b.write("tag v1.0\n".getBytes(CHARSET));
-		b.write("tagger t <t@example.com> 1218123387 +0700\n".getBytes(CHARSET));
-		b.write("encoding utf-8logoutputencoding=gbk\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("message\n".getBytes(CHARSET));
+		b.write("object 9788669ad918b6fcce64af8882fc9a81cb6aba67\n".getBytes(UTF_8));
+		b.write("type tree\n".getBytes(UTF_8));
+		b.write("tag v1.0\n".getBytes(UTF_8));
+		b.write("tagger t <t@example.com> 1218123387 +0700\n".getBytes(UTF_8));
+		b.write("encoding utf-8logoutputencoding=gbk\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("message\n".getBytes(UTF_8));
 
 		RevTag t = new RevTag(id("9473095c4cb2f12aefe1db8a355fe3fafba42f67"));
 		t.parseCanonical(new RevWalk(db), b.toByteArray());
@@ -384,13 +384,13 @@
 	@Test
 	public void testParse_unsupportedEncoding() throws Exception {
 		ByteArrayOutputStream b = new ByteArrayOutputStream();
-		b.write("object 9788669ad918b6fcce64af8882fc9a81cb6aba67\n".getBytes(CHARSET));
-		b.write("type tree\n".getBytes(CHARSET));
-		b.write("tag v1.0\n".getBytes(CHARSET));
-		b.write("tagger t <t@example.com> 1218123387 +0700\n".getBytes(CHARSET));
-		b.write("encoding it_IT.UTF8\n".getBytes(CHARSET));
-		b.write("\n".getBytes(CHARSET));
-		b.write("message\n".getBytes(CHARSET));
+		b.write("object 9788669ad918b6fcce64af8882fc9a81cb6aba67\n".getBytes(UTF_8));
+		b.write("type tree\n".getBytes(UTF_8));
+		b.write("tag v1.0\n".getBytes(UTF_8));
+		b.write("tagger t <t@example.com> 1218123387 +0700\n".getBytes(UTF_8));
+		b.write("encoding it_IT.UTF8\n".getBytes(UTF_8));
+		b.write("\n".getBytes(UTF_8));
+		b.write("message\n".getBytes(UTF_8));
 
 		RevTag t = new RevTag(id("9473095c4cb2f12aefe1db8a355fe3fafba42f67"));
 		t.parseCanonical(new RevWalk(db), b.toByteArray());
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevWalkCullTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevWalkCullTest.java
index fb52828..7984a37 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevWalkCullTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevWalkCullTest.java
@@ -85,7 +85,7 @@
 
 	@Test
 	public void testProperlyCullAllAncestors_LongHistory() throws Exception {
-		final RevCommit a = commit();
+		RevCommit a = commit();
 		RevCommit b = commit(a);
 		for (int i = 0; i < 24; i++) {
 			b = commit(b);
@@ -94,6 +94,12 @@
 		}
 		final RevCommit c = commit(b);
 
+		// TestRepository eagerly parses newly created objects. The current rw
+		// is caching that parsed state. To verify that RevWalk itself is lazy,
+		// set up a new one.
+		rw.close();
+		rw = createRevWalk();
+		RevCommit a2 = rw.lookupCommit(a);
 		markStart(c);
 		markUninteresting(b);
 		assertCommit(c, rw.next());
@@ -102,6 +108,6 @@
 		// We should have aborted before we got back so far that "a"
 		// would be parsed. Thus, its parents shouldn't be allocated.
 		//
-		assertNull(a.parents);
+		assertNull(a2.parents);
 	}
 }
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevWalkShallowTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevWalkShallowTest.java
index 6df36e7..7554d7a 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevWalkShallowTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevWalkShallowTest.java
@@ -58,138 +58,155 @@
 
 	@Test
 	public void testDepth1() throws Exception {
-		final RevCommit a = commit();
-		final RevCommit b = commit(a);
-		final RevCommit c = commit(b);
-		final RevCommit d = commit(c);
+		RevCommit[] commits = setupLinearChain();
 
-		createShallowFile(d);
+		createShallowFile(commits[3]);
+		updateCommits(commits);
 
-		rw.reset();
-		markStart(d);
-		assertCommit(d, rw.next());
+		rw.markStart(commits[3]);
+		assertCommit(commits[3], rw.next());
 		assertNull(rw.next());
 	}
 
 	@Test
 	public void testDepth2() throws Exception {
-		final RevCommit a = commit();
-		final RevCommit b = commit(a);
-		final RevCommit c = commit(b);
-		final RevCommit d = commit(c);
+		RevCommit[] commits = setupLinearChain();
 
-		createShallowFile(c);
+		createShallowFile(commits[2]);
+		updateCommits(commits);
 
-		rw.reset();
-		markStart(d);
-		assertCommit(d, rw.next());
-		assertCommit(c, rw.next());
+		rw.markStart(commits[3]);
+		assertCommit(commits[3], rw.next());
+		assertCommit(commits[2], rw.next());
 		assertNull(rw.next());
 	}
 
 	@Test
 	public void testDepth3() throws Exception {
-		final RevCommit a = commit();
-		final RevCommit b = commit(a);
-		final RevCommit c = commit(b);
-		final RevCommit d = commit(c);
+		RevCommit[] commits = setupLinearChain();
 
-		createShallowFile(b);
+		createShallowFile(commits[1]);
+		updateCommits(commits);
 
-		rw.reset();
-		markStart(d);
-		assertCommit(d, rw.next());
-		assertCommit(c, rw.next());
-		assertCommit(b, rw.next());
-		assertNull(rw.next());
-	}
-
-	@Test
-	public void testMergeCommitOneParentShallow() throws Exception {
-		final RevCommit a = commit();
-		final RevCommit b = commit(a);
-		final RevCommit c = commit(b);
-		final RevCommit d = commit(b);
-		final RevCommit e = commit(d);
-		final RevCommit merge = commit(c, e);
-
-		createShallowFile(e);
-
-		rw.reset();
-		markStart(merge);
-		assertCommit(merge, rw.next());
-		assertCommit(e, rw.next());
-		assertCommit(c, rw.next());
-		assertCommit(b, rw.next());
-		assertCommit(a, rw.next());
-		assertNull(rw.next());
-	}
-
-	@Test
-	public void testMergeCommitEntirelyShallow() throws Exception {
-		final RevCommit a = commit();
-		final RevCommit b = commit(a);
-		final RevCommit c = commit(b);
-		final RevCommit d = commit(b);
-		final RevCommit e = commit(d);
-		final RevCommit merge = commit(c, e);
-
-		createShallowFile(c, e);
-
-		rw.reset();
-		markStart(merge);
-		assertCommit(merge, rw.next());
-		assertCommit(e, rw.next());
-		assertCommit(c, rw.next());
+		rw.markStart(commits[3]);
+		assertCommit(commits[3], rw.next());
+		assertCommit(commits[2], rw.next());
+		assertCommit(commits[1], rw.next());
 		assertNull(rw.next());
 	}
 
 	@Test
 	public void testObjectDirectorySnapshot() throws Exception {
-		RevCommit a = commit();
-		RevCommit b = commit(a);
-		RevCommit c = commit(b);
-		RevCommit d = commit(c);
+		RevCommit[] commits = setupLinearChain();
 
-		createShallowFile(d);
+		createShallowFile(commits[3]);
+		updateCommits(commits);
 
-		rw.reset();
-		markStart(d);
-		assertCommit(d, rw.next());
+		markStart(commits[3]);
+		assertCommit(commits[3], rw.next());
 		assertNull(rw.next());
 
-		rw = createRevWalk();
-		a = rw.lookupCommit(a);
-		b = rw.lookupCommit(b);
-		c = rw.lookupCommit(c);
-		d = rw.lookupCommit(d);
+		createShallowFile(commits[2]);
+		updateCommits(commits);
 
-		rw.reset();
-		markStart(d);
-		assertCommit(d, rw.next());
+		markStart(commits[3]);
+		assertCommit(commits[3], rw.next());
+		assertCommit(commits[2], rw.next());
 		assertNull(rw.next());
+	}
 
-		createShallowFile(c);
+	private RevCommit[] setupLinearChain() throws Exception {
+		RevCommit[] commits = new RevCommit[4];
+		RevCommit parent = null;
+		for (int i = 0; i < commits.length; i++) {
+			commits[i] = parent != null ? commit(parent) : commit();
+			parent = commits[i];
+		}
+		return commits;
+	}
 
-		rw = createRevWalk();
-		a = rw.lookupCommit(a);
-		b = rw.lookupCommit(b);
-		c = rw.lookupCommit(c);
-		d = rw.lookupCommit(d);
+	@Test
+	public void testMergeCommitOneParentShallow() throws Exception {
+		RevCommit[] commits = setupMergeChain();
 
-		rw.reset();
-		markStart(d);
-		assertCommit(d, rw.next());
-		assertCommit(c, rw.next());
+		createShallowFile(commits[4]);
+		updateCommits(commits);
+
+		markStart(commits[5]);
+		assertCommit(commits[5], rw.next());
+		assertCommit(commits[4], rw.next());
+		assertCommit(commits[2], rw.next());
+		assertCommit(commits[1], rw.next());
+		assertCommit(commits[0], rw.next());
 		assertNull(rw.next());
 	}
 
+	@Test
+	public void testMergeCommitEntirelyShallow() throws Exception {
+		RevCommit[] commits = setupMergeChain();
+
+		createShallowFile(commits[2], commits[4]);
+		updateCommits(commits);
+
+		markStart(commits[5]);
+		assertCommit(commits[5], rw.next());
+		assertCommit(commits[4], rw.next());
+		assertCommit(commits[2], rw.next());
+		assertNull(rw.next());
+	}
+
+	private RevCommit[] setupMergeChain() throws Exception {
+		/*-
+		 * Create a history like this, diverging at 1 and merging at 5:
+		 *
+		 *      ---o--o       commits 3,4
+		 *     /       \
+		 * o--o--o------o   commits 0,1,2,5
+		 */
+		RevCommit[] commits = new RevCommit[6];
+		commits[0] = commit();
+		commits[1] = commit(commits[0]);
+		commits[2] = commit(commits[1]);
+		commits[3] = commit(commits[1]);
+		commits[4] = commit(commits[3]);
+		commits[5] = commit(commits[2], commits[4]);
+		return commits;
+	}
+
+	private void updateCommits(RevCommit[] commits) {
+		// Relookup commits using the new RevWalk
+		for (int i = 0; i < commits.length; i++) {
+			commits[i] = rw.lookupCommit(commits[i].getId());
+		}
+	}
+
 	private void createShallowFile(ObjectId... shallowCommits)
 			throws IOException {
-		final StringBuilder builder = new StringBuilder();
-		for (ObjectId commit : shallowCommits)
+		// Reset the RevWalk since the new shallow file invalidates the existing
+		// RevWalk's shallow state.
+		rw.close();
+		rw = createRevWalk();
+		StringBuilder builder = new StringBuilder();
+		for (ObjectId commit : shallowCommits) {
 			builder.append(commit.getName() + "\n");
+		}
 		JGitTestUtil.write(new File(db.getDirectory(), "shallow"),
 				builder.toString());
 	}
+
+	@Test
+	public void testShallowCommitParse() throws Exception {
+		RevCommit a = commit();
+		RevCommit b = commit(a);
+
+		createShallowFile(b);
+
+		rw.close();
+		rw = createRevWalk();
+		b = rw.parseCommit(b);
+
+		markStart(b);
+		assertCommit(b, rw.next());
+		assertNull(rw.next());
+	}
 }
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevWalkUtilsReachableTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevWalkUtilsReachableTest.java
index a26ae10..cb92a95 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevWalkUtilsReachableTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/RevWalkUtilsReachableTest.java
@@ -115,7 +115,7 @@
 	}
 
 	private void assertContains(RevCommit commit, Collection<Ref> refsThatShouldContainCommit) throws Exception {
-		Collection<Ref> allRefs = db.getAllRefs().values();
+		Collection<Ref> allRefs = db.getRefDatabase().getRefs();
 		Collection<Ref> sortedRefs = RefComparator.sort(allRefs);
 		List<Ref> actual = RevWalkUtils.findBranchesReachableFrom(commit,
 				rw, sortedRefs);
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/storage/file/FileBasedConfigTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/storage/file/FileBasedConfigTest.java
index 0dea5ce..7f0d602 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/storage/file/FileBasedConfigTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/storage/file/FileBasedConfigTest.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.storage.file;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.util.FileUtils.pathToString;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
@@ -105,7 +105,7 @@
 
 	@Test
 	public void testUTF8withoutBOM() throws IOException, ConfigInvalidException {
-		final File file = createFile(CONTENT1.getBytes(CHARSET));
+		final File file = createFile(CONTENT1.getBytes(UTF_8));
 		final FileBasedConfig config = new FileBasedConfig(file, FS.DETECTED);
 		config.load();
 		assertEquals(ALICE, config.getString(USER, null, NAME));
@@ -121,7 +121,7 @@
 		bos1.write(0xEF);
 		bos1.write(0xBB);
 		bos1.write(0xBF);
-		bos1.write(CONTENT1.getBytes(CHARSET));
+		bos1.write(CONTENT1.getBytes(UTF_8));
 
 		final File file = createFile(bos1.toByteArray());
 		final FileBasedConfig config = new FileBasedConfig(file, FS.DETECTED);
@@ -135,7 +135,7 @@
 		bos2.write(0xEF);
 		bos2.write(0xBB);
 		bos2.write(0xBF);
-		bos2.write(CONTENT2.getBytes(CHARSET));
+		bos2.write(CONTENT2.getBytes(UTF_8));
 		assertArrayEquals(bos2.toByteArray(), IO.readFully(file));
 	}
 
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/submodule/SubmoduleAddTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/submodule/SubmoduleAddTest.java
index 5780973..1ff64a2 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/submodule/SubmoduleAddTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/submodule/SubmoduleAddTest.java
@@ -136,7 +136,49 @@
 			}
 
 			SubmoduleWalk generator = SubmoduleWalk.forIndex(db);
+			generator.loadModulesConfig();
 			assertTrue(generator.next());
+			assertEquals(path, generator.getModuleName());
+			assertEquals(path, generator.getPath());
+			assertEquals(commit, generator.getObjectId());
+			assertEquals(uri, generator.getModulesUrl());
+			assertEquals(path, generator.getModulesPath());
+			assertEquals(uri, generator.getConfigUrl());
+			try (Repository subModRepo = generator.getRepository()) {
+				assertNotNull(subModRepo);
+				assertEquals(subCommit, commit);
+			}
+
+			Status status = Git.wrap(db).status().call();
+			assertTrue(status.getAdded().contains(Constants.DOT_GIT_MODULES));
+			assertTrue(status.getAdded().contains(path));
+		}
+	}
+
+	@Test
+	public void addSubmoduleWithName() throws Exception {
+		try (Git git = new Git(db)) {
+			writeTrashFile("file.txt", "content");
+			git.add().addFilepattern("file.txt").call();
+			RevCommit commit = git.commit().setMessage("create file").call();
+
+			SubmoduleAddCommand command = new SubmoduleAddCommand(db);
+			String name = "testsub";
+			command.setName(name);
+			String path = "sub";
+			command.setPath(path);
+			String uri = db.getDirectory().toURI().toString();
+			command.setURI(uri);
+			ObjectId subCommit;
+			try (Repository repo = command.call()) {
+				assertNotNull(repo);
+				subCommit = repo.resolve(Constants.HEAD);
+			}
+
+			SubmoduleWalk generator = SubmoduleWalk.forIndex(db);
+			generator.loadModulesConfig();
+			assertTrue(generator.next());
+			assertEquals(name, generator.getModuleName());
 			assertEquals(path, generator.getPath());
 			assertEquals(commit, generator.getObjectId());
 			assertEquals(uri, generator.getModulesUrl());
@@ -187,16 +229,13 @@
 	public void addSubmoduleWithInvalidPath() throws Exception {
 		SubmoduleAddCommand command = new SubmoduleAddCommand(db);
 		command.setPath("-invalid-path");
-		// TODO(ms) set name to a valid value in 5.1.0 and adapt expected
-		// message below
+		command.setName("sub");
 		command.setURI("http://example.com/repo/x.git");
 		try {
 			command.call().close();
 			fail("Exception not thrown");
 		} catch (IllegalArgumentException e) {
-			// TODO(ms) should check for submodule path, but can't set name
-			// before 5.1.0
-			assertEquals("Invalid submodule name '-invalid-path'",
+			assertEquals("Invalid submodule path '-invalid-path'",
 					e.getMessage());
 		}
 	}
@@ -299,4 +338,18 @@
 					ConfigConstants.CONFIG_KEY_URL));
 		}
 	}
+
+	@Test
+	public void denySubmoduleWithDotDot() throws Exception {
+		SubmoduleAddCommand command = new SubmoduleAddCommand(db);
+		command.setName("dir/../");
+		command.setPath("sub");
+		command.setURI(db.getDirectory().toURI().toString());
+		try {
+			command.call();
+			fail();
+		} catch (IllegalArgumentException e) {
+			// Expected
+		}
+	}
 }
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/submodule/SubmoduleDeinitTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/submodule/SubmoduleDeinitTest.java
index df4b963..815ce9b 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/submodule/SubmoduleDeinitTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/submodule/SubmoduleDeinitTest.java
@@ -136,10 +136,12 @@
 		generator.next();
 
 		//want to create a commit inside the repo...
-		Repository submoduleLocalRepo = generator.getRepository();
-		JGitTestUtil.writeTrashFile(submoduleLocalRepo, "file.txt", "new data");
-		Git.wrap(submoduleLocalRepo).commit().setAll(true).setMessage("local commit").call();
-
+		try (Repository submoduleLocalRepo = generator.getRepository()) {
+			JGitTestUtil.writeTrashFile(submoduleLocalRepo, "file.txt",
+					"new data");
+			Git.wrap(submoduleLocalRepo).commit().setAll(true)
+					.setMessage("local commit").call();
+		}
 		SubmoduleDeinitResult result = runDeinit(new SubmoduleDeinitCommand(db).addPath("sub"));
 		assertEquals(path, result.getPath());
 		assertEquals(SubmoduleDeinitCommand.SubmoduleDeinitStatus.DIRTY, result.getStatus());
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/BundleWriterTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/BundleWriterTest.java
index d30ac84..7b31bfa 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/BundleWriterTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/BundleWriterTest.java
@@ -45,7 +45,7 @@
 
 package org.eclipse.jgit.transport;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.lib.Constants.OBJ_BLOB;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
@@ -199,7 +199,8 @@
 			Ref ref = repo.exactRef(refName);
 			assertNotNull(ref);
 			assertEquals(id, ref.getObjectId());
-			assertEquals(data, new String(repo.open(id, OBJ_BLOB).getBytes(), CHARSET));
+			assertEquals(data,
+					new String(repo.open(id, OBJ_BLOB).getBytes(), UTF_8));
 		}
 	}
 
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/NetRCTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/NetRCTest.java
index 4e5d56a..2a4e492 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/NetRCTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/NetRCTest.java
@@ -42,7 +42,7 @@
 
 package org.eclipse.jgit.transport;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNull;
 
@@ -76,7 +76,7 @@
 
 	private void config(String data) throws IOException {
 		try (OutputStreamWriter fw = new OutputStreamWriter(
-				new FileOutputStream(configFile), CHARSET)) {
+				new FileOutputStream(configFile), UTF_8)) {
 			fw.write(data);
 		}
 	}
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/OpenSshConfigTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/OpenSshConfigTest.java
index abf80ec..19fcbfd 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/OpenSshConfigTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/OpenSshConfigTest.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.transport;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
@@ -94,7 +94,7 @@
 		long lastMtime = configFile.lastModified();
 		do {
 			try (final OutputStreamWriter fw = new OutputStreamWriter(
-					new FileOutputStream(configFile), CHARSET)) {
+					new FileOutputStream(configFile), UTF_8)) {
 				fw.write(data);
 			}
 		} while (lastMtime == configFile.lastModified());
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/ProtocolV2ParserTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/ProtocolV2ParserTest.java
new file mode 100644
index 0000000..4d11508
--- /dev/null
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/ProtocolV2ParserTest.java
@@ -0,0 +1,336 @@
+/*
+ * Copyright (C) 2018, Google LLC.
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.eclipse.jgit.transport;
+
+import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.hasItems;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertTrue;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.Collection;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.eclipse.jgit.errors.PackProtocolException;
+import org.eclipse.jgit.internal.storage.dfs.DfsRepositoryDescription;
+import org.eclipse.jgit.internal.storage.dfs.InMemoryRepository;
+import org.eclipse.jgit.junit.TestRepository;
+import org.eclipse.jgit.lib.Config;
+import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.revwalk.RevCommit;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+public class ProtocolV2ParserTest {
+
+	@Rule
+	public ExpectedException thrown = ExpectedException.none();
+
+	private TestRepository<InMemoryRepository> testRepo;
+
+	@Before
+	public void setUp() throws Exception {
+		testRepo = new TestRepository<>(newRepo("protocol-v2-parser-test"));
+	}
+
+	private static InMemoryRepository newRepo(String name) {
+		return new InMemoryRepository(new DfsRepositoryDescription(name));
+	}
+
+	private static class ConfigBuilder {
+
+		private boolean allowRefInWant;
+
+		private boolean allowFilter;
+
+		private ConfigBuilder() {
+		}
+
+		static ConfigBuilder start() {
+			return new ConfigBuilder();
+		}
+
+		static TransferConfig getDefault() {
+			return start().done();
+		}
+
+		ConfigBuilder allowRefInWant() {
+			allowRefInWant = true;
+			return this;
+		}
+
+		ConfigBuilder allowFilter() {
+			allowFilter = true;
+			return this;
+		}
+
+		TransferConfig done() {
+			Config rc = new Config();
+			rc.setBoolean("uploadpack", null, "allowrefinwant", allowRefInWant);
+			rc.setBoolean("uploadpack", null, "allowfilter", allowFilter);
+			return new TransferConfig(rc);
+		}
+	}
+
+	/*
+	 * Convert the input lines to the PacketLine that the parser reads.
+	 */
+	private static PacketLineIn formatAsPacketLine(String... inputLines)
+			throws IOException {
+		ByteArrayOutputStream send = new ByteArrayOutputStream();
+		PacketLineOut pckOut = new PacketLineOut(send);
+		for (String line : inputLines) {
+			if (line == PacketLineIn.END) {
+				pckOut.end();
+			} else if (line == PacketLineIn.DELIM) {
+				pckOut.writeDelim();
+			} else {
+				pckOut.writeString(line);
+			}
+		}
+
+		return new PacketLineIn(new ByteArrayInputStream(send.toByteArray()));
+	}
+
+	private static List<String> objIdsAsStrings(Collection<ObjectId> objIds) {
+		// TODO(ifrade) Translate this to a matcher, so it would read as
+		// assertThat(req.wantsIds(), hasObjectIds("...", "..."))
+		return objIds.stream().map(ObjectId::name).collect(Collectors.toList());
+	}
+
+	/*
+	 * Succesful fetch with the basic core commands of the protocol.
+	 */
+	@Test
+	public void testFetchBasicArguments()
+			throws PackProtocolException, IOException {
+		PacketLineIn pckIn = formatAsPacketLine(
+				PacketLineIn.DELIM,
+				"thin-pack", "no-progress", "include-tag", "ofs-delta",
+				"want 4624442d68ee402a94364191085b77137618633e",
+				"want f900c8326a43303685c46b279b9f70411bff1a4b",
+				"have 554f6e41067b9e3e565b6988a8294fac1cb78f4b",
+				"have abc760ab9ad72f08209943251b36cb886a578f87", "done",
+				PacketLineIn.END);
+		ProtocolV2Parser parser = new ProtocolV2Parser(
+				ConfigBuilder.getDefault());
+		FetchV2Request request = parser.parseFetchRequest(pckIn,
+				testRepo.getRepository().getRefDatabase());
+		assertTrue(request.getOptions()
+				.contains(GitProtocolConstants.OPTION_THIN_PACK));
+		assertTrue(request.getOptions()
+				.contains(GitProtocolConstants.OPTION_NO_PROGRESS));
+		assertTrue(request.getOptions()
+				.contains(GitProtocolConstants.OPTION_INCLUDE_TAG));
+		assertTrue(request.getOptions()
+				.contains(GitProtocolConstants.CAPABILITY_OFS_DELTA));
+		assertThat(objIdsAsStrings(request.getWantsIds()),
+				hasItems("4624442d68ee402a94364191085b77137618633e",
+						"f900c8326a43303685c46b279b9f70411bff1a4b"));
+		assertThat(objIdsAsStrings(request.getPeerHas()),
+				hasItems("554f6e41067b9e3e565b6988a8294fac1cb78f4b",
+						"abc760ab9ad72f08209943251b36cb886a578f87"));
+		assertTrue(request.getWantedRefs().isEmpty());
+		assertTrue(request.wasDoneReceived());
+	}
+
+	@Test
+	public void testFetchWithShallow_deepen() throws IOException {
+		PacketLineIn pckIn = formatAsPacketLine(
+				PacketLineIn.DELIM,
+				"deepen 15",
+				"deepen-relative",
+				"shallow 28274d02c489f4c7e68153056e9061a46f62d7a0",
+				"shallow 145e683b229dcab9d0e2ccb01b386f9ecc17d29d",
+				PacketLineIn.END);
+		ProtocolV2Parser parser = new ProtocolV2Parser(
+				ConfigBuilder.getDefault());
+		FetchV2Request request = parser.parseFetchRequest(pckIn,
+				testRepo.getRepository().getRefDatabase());
+		assertThat(objIdsAsStrings(request.getClientShallowCommits()),
+				hasItems("28274d02c489f4c7e68153056e9061a46f62d7a0",
+						"145e683b229dcab9d0e2ccb01b386f9ecc17d29d"));
+		assertTrue(request.getDeepenNotRefs().isEmpty());
+		assertEquals(15, request.getDepth());
+		assertTrue(request.getOptions()
+				.contains(GitProtocolConstants.OPTION_DEEPEN_RELATIVE));
+	}
+
+	@Test
+	public void testFetchWithShallow_deepenNot() throws IOException {
+		PacketLineIn pckIn = formatAsPacketLine(PacketLineIn.DELIM,
+				"shallow 28274d02c489f4c7e68153056e9061a46f62d7a0",
+				"shallow 145e683b229dcab9d0e2ccb01b386f9ecc17d29d",
+				"deepen-not a08595f76159b09d57553e37a5123f1091bb13e7",
+				PacketLineIn.END);
+		ProtocolV2Parser parser = new ProtocolV2Parser(
+				ConfigBuilder.getDefault());
+		FetchV2Request request = parser.parseFetchRequest(pckIn,
+				testRepo.getRepository().getRefDatabase());
+		assertThat(objIdsAsStrings(request.getClientShallowCommits()),
+				hasItems("28274d02c489f4c7e68153056e9061a46f62d7a0",
+						"145e683b229dcab9d0e2ccb01b386f9ecc17d29d"));
+		assertThat(request.getDeepenNotRefs(),
+				hasItems("a08595f76159b09d57553e37a5123f1091bb13e7"));
+	}
+
+	@Test
+	public void testFetchWithShallow_deepenSince() throws IOException {
+		PacketLineIn pckIn = formatAsPacketLine(PacketLineIn.DELIM,
+				"shallow 28274d02c489f4c7e68153056e9061a46f62d7a0",
+				"shallow 145e683b229dcab9d0e2ccb01b386f9ecc17d29d",
+				"deepen-since 123123123",
+				PacketLineIn.END);
+		ProtocolV2Parser parser = new ProtocolV2Parser(
+				ConfigBuilder.getDefault());
+		FetchV2Request request = parser.parseFetchRequest(pckIn,
+				testRepo.getRepository().getRefDatabase());
+		assertThat(objIdsAsStrings(request.getClientShallowCommits()),
+				hasItems("28274d02c489f4c7e68153056e9061a46f62d7a0",
+						"145e683b229dcab9d0e2ccb01b386f9ecc17d29d"));
+		assertEquals(123123123, request.getDeepenSince());
+	}
+
+	@Test
+	public void testFetchWithNoneFilter() throws IOException {
+		PacketLineIn pckIn = formatAsPacketLine(PacketLineIn.DELIM,
+				"filter blob:none",
+				PacketLineIn.END);
+		ProtocolV2Parser parser = new ProtocolV2Parser(
+				ConfigBuilder.start().allowFilter().done());
+		FetchV2Request request = parser.parseFetchRequest(pckIn,
+				testRepo.getRepository().getRefDatabase());
+		assertEquals(0, request.getFilterBlobLimit());
+	}
+
+	@Test
+	public void testFetchWithBlobSizeFilter() throws IOException {
+		PacketLineIn pckIn = formatAsPacketLine(PacketLineIn.DELIM,
+				"filter blob:limit=15",
+				PacketLineIn.END);
+		ProtocolV2Parser parser = new ProtocolV2Parser(
+				ConfigBuilder.start().allowFilter().done());
+		FetchV2Request request = parser.parseFetchRequest(pckIn,
+				testRepo.getRepository().getRefDatabase());
+		assertEquals(15, request.getFilterBlobLimit());
+	}
+
+	@Test
+	public void testFetchMustNotHaveMultipleFilters() throws IOException {
+		thrown.expect(PackProtocolException.class);
+		PacketLineIn pckIn = formatAsPacketLine(PacketLineIn.DELIM,
+				"filter blob:none",
+				"filter blob:limit=12",
+				PacketLineIn.END);
+		ProtocolV2Parser parser = new ProtocolV2Parser(
+				ConfigBuilder.start().allowFilter().done());
+		FetchV2Request request = parser.parseFetchRequest(pckIn,
+				testRepo.getRepository().getRefDatabase());
+		assertEquals(0, request.getFilterBlobLimit());
+	}
+
+	@Test
+	public void testFetchFilterWithoutAllowFilter() throws IOException {
+		thrown.expect(PackProtocolException.class);
+		PacketLineIn pckIn = formatAsPacketLine(PacketLineIn.DELIM,
+				"filter blob:limit=12", PacketLineIn.END);
+		ProtocolV2Parser parser = new ProtocolV2Parser(
+				ConfigBuilder.getDefault());
+		parser.parseFetchRequest(pckIn,
+				testRepo.getRepository().getRefDatabase());
+	}
+
+	@Test
+	public void testFetchWithRefInWant() throws Exception {
+		RevCommit one = testRepo.commit().message("1").create();
+		RevCommit two = testRepo.commit().message("2").create();
+		testRepo.update("branchA", one);
+		testRepo.update("branchB", two);
+
+		PacketLineIn pckIn = formatAsPacketLine(PacketLineIn.DELIM,
+				"want e4980cdc48cfa1301493ca94eb70523f6788b819",
+				"want-ref refs/heads/branchA",
+				PacketLineIn.END);
+		ProtocolV2Parser parser = new ProtocolV2Parser(
+				ConfigBuilder.start().allowRefInWant().done());
+
+
+		FetchV2Request request = parser.parseFetchRequest(pckIn,
+				testRepo.getRepository().getRefDatabase());
+		assertEquals(1, request.getWantedRefs().size());
+		assertThat(request.getWantedRefs().keySet(),
+				hasItems("refs/heads/branchA"));
+		assertEquals(2, request.getWantsIds().size());
+		assertThat(objIdsAsStrings(request.getWantsIds()),
+				hasItems("e4980cdc48cfa1301493ca94eb70523f6788b819",
+						one.getName()));
+	}
+
+	@Test
+	public void testFetchWithRefInWantUnknownRef() throws Exception {
+		thrown.expect(PackProtocolException.class);
+		thrown.expectMessage(containsString("refs/heads/branchC"));
+
+		PacketLineIn pckIn = formatAsPacketLine(PacketLineIn.DELIM,
+				"want e4980cdc48cfa1301493ca94eb70523f6788b819",
+				"want-ref refs/heads/branchC",
+				PacketLineIn.END);
+		ProtocolV2Parser parser = new ProtocolV2Parser(
+				ConfigBuilder.start().allowRefInWant().done());
+
+		RevCommit one = testRepo.commit().message("1").create();
+		RevCommit two = testRepo.commit().message("2").create();
+		testRepo.update("branchA", one);
+		testRepo.update("branchB", two);
+
+		parser.parseFetchRequest(pckIn,
+				testRepo.getRepository().getRefDatabase());
+	}
+
+}
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/ReceivePackAdvertiseRefsHookTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/ReceivePackAdvertiseRefsHookTest.java
index 0ffbe65..c959f6c 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/ReceivePackAdvertiseRefsHookTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/ReceivePackAdvertiseRefsHookTest.java
@@ -259,6 +259,7 @@
 		try (TransportLocal t = newTransportLocalWithStrictValidation()) {
 			t.setPushThin(true);
 			r = t.push(PM, Collections.singleton(u));
+			dst.close();
 		}
 
 		assertNotNull("have result", r);
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/TestProtocolTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/TestProtocolTest.java
index 86c92bb..953c9fc 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/TestProtocolTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/TestProtocolTest.java
@@ -77,6 +77,7 @@
 			"+refs/heads/master:refs/heads/master");
 
 	private static final int HAVES_PER_ROUND = 32;
+	private static final int MAX_HAVES = 256;
 
 	private static class User {
 		private final String name;
@@ -187,7 +188,7 @@
 	}
 
 	@Test
-	public void testMinimalNegotiation() throws Exception {
+	public void testMaxHaves() throws Exception {
 		TestProtocol<User> proto = registerDefault();
 		URIish uri = proto.register(new User("user"), remote.getRepository());
 
@@ -200,28 +201,13 @@
 		RevCommit master = remote.branch("master").commit()
 				.add("readme.txt", "unique commit").create();
 
-		TestProtocol.setFetchConfig(new FetchConfig(true, true));
+		TestProtocol.setFetchConfig(new FetchConfig(true, MAX_HAVES));
 		try (Git git = new Git(local.getRepository())) {
 			assertNull(local.getRepository().exactRef("refs/heads/master"));
 			git.fetch().setRemote(uri.toString()).setRefSpecs(MASTER).call();
 			assertEquals(master, local.getRepository()
 					.exactRef("refs/heads/master").getObjectId());
-			assertTrue(havesCount <= 2 * HAVES_PER_ROUND);
-
-			// Update the remote master and add local branches for 5 more rounds
-			// of negotiation, where the local branch commits have newer
-			// timestamps. Negotiation should send 5 rounds for those newer
-			// branches before getting to the round that sends its stale version
-			// of master.
-			master = remote.branch("master").commit().parent(master).create();
-			local.tick(2 * HAVES_PER_ROUND);
-			for (int i = 0; i < 5 * HAVES_PER_ROUND; i++) {
-				local.branch("local-" + i).commit().create();
-			}
-			git.fetch().setRemote(uri.toString()).setRefSpecs(MASTER).call();
-			assertEquals(master, local.getRepository()
-					.exactRef("refs/heads/master").getObjectId());
-			assertEquals(6 * HAVES_PER_ROUND, havesCount);
+			assertTrue(havesCount <= MAX_HAVES);
 		}
 	}
 
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/UploadPackTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/UploadPackTest.java
index ef083da..317ac32 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/UploadPackTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/UploadPackTest.java
@@ -1,20 +1,25 @@
 package org.eclipse.jgit.transport;
 
+import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.Matchers.hasItems;
 import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.notNullValue;
 import static org.hamcrest.Matchers.theInstance;
+import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
 
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.Map;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.StringWriter;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
 import org.eclipse.jgit.errors.PackProtocolException;
 import org.eclipse.jgit.errors.TransportException;
 import org.eclipse.jgit.internal.storage.dfs.DfsGarbageCollector;
@@ -29,8 +34,8 @@
 import org.eclipse.jgit.lib.TextProgressMonitor;
 import org.eclipse.jgit.revwalk.RevBlob;
 import org.eclipse.jgit.revwalk.RevCommit;
-import org.eclipse.jgit.revwalk.RevTree;
 import org.eclipse.jgit.revwalk.RevTag;
+import org.eclipse.jgit.revwalk.RevTree;
 import org.eclipse.jgit.transport.UploadPack.RequestPolicy;
 import org.eclipse.jgit.transport.resolver.ServiceNotAuthorizedException;
 import org.eclipse.jgit.transport.resolver.ServiceNotEnabledException;
@@ -227,6 +232,44 @@
 	}
 
 	@Test
+	public void testFetchExplicitBlobWithFilter() throws Exception {
+		InMemoryRepository server2 = newRepo("server2");
+		TestRepository<InMemoryRepository> remote2 =
+				new TestRepository<>(server2);
+		RevBlob blob1 = remote2.blob("foobar");
+		RevBlob blob2 = remote2.blob("fooba");
+		RevTree tree = remote2.tree(remote2.file("1", blob1),
+				remote2.file("2", blob2));
+		RevCommit commit = remote2.commit(tree);
+		remote2.update("master", commit);
+		remote2.update("a_blob", blob1);
+
+		server2.getConfig().setBoolean("uploadpack", null, "allowfilter", true);
+
+		testProtocol = new TestProtocol<>(
+				new UploadPackFactory<Object>() {
+					@Override
+					public UploadPack create(Object req, Repository db)
+							throws ServiceNotEnabledException,
+							ServiceNotAuthorizedException {
+						UploadPack up = new UploadPack(db);
+						return up;
+					}
+				}, null);
+		uri = testProtocol.register(ctx, server2);
+
+		try (Transport tn = testProtocol.open(uri, client, "server2")) {
+			tn.setFilterBlobLimit(0);
+			tn.fetch(NullProgressMonitor.INSTANCE, Arrays.asList(
+						new RefSpec(commit.name()),
+						new RefSpec(blob1.name())));
+			assertTrue(client.hasObject(tree.toObjectId()));
+			assertTrue(client.hasObject(blob1.toObjectId()));
+			assertFalse(client.hasObject(blob2.toObjectId()));
+		}
+	}
+
+	@Test
 	public void testFetchWithBlobLimitFilter() throws Exception {
 		InMemoryRepository server2 = newRepo("server2");
 		TestRepository<InMemoryRepository> remote2 =
@@ -262,6 +305,47 @@
 	}
 
 	@Test
+	public void testFetchExplicitBlobWithFilterAndBitmaps() throws Exception {
+		InMemoryRepository server2 = newRepo("server2");
+		TestRepository<InMemoryRepository> remote2 =
+				new TestRepository<>(server2);
+		RevBlob blob1 = remote2.blob("foobar");
+		RevBlob blob2 = remote2.blob("fooba");
+		RevTree tree = remote2.tree(remote2.file("1", blob1),
+				remote2.file("2", blob2));
+		RevCommit commit = remote2.commit(tree);
+		remote2.update("master", commit);
+		remote2.update("a_blob", blob1);
+
+		server2.getConfig().setBoolean("uploadpack", null, "allowfilter", true);
+
+		// generate bitmaps
+		new DfsGarbageCollector(server2).pack(null);
+		server2.scanForRepoChanges();
+
+		testProtocol = new TestProtocol<>(
+				new UploadPackFactory<Object>() {
+					@Override
+					public UploadPack create(Object req, Repository db)
+							throws ServiceNotEnabledException,
+							ServiceNotAuthorizedException {
+						UploadPack up = new UploadPack(db);
+						return up;
+					}
+				}, null);
+		uri = testProtocol.register(ctx, server2);
+
+		try (Transport tn = testProtocol.open(uri, client, "server2")) {
+			tn.setFilterBlobLimit(0);
+			tn.fetch(NullProgressMonitor.INSTANCE, Arrays.asList(
+						new RefSpec(commit.name()),
+						new RefSpec(blob1.name())));
+			assertTrue(client.hasObject(blob1.toObjectId()));
+			assertFalse(client.hasObject(blob2.toObjectId()));
+		}
+	}
+
+	@Test
 	public void testFetchWithBlobLimitFilterAndBitmaps() throws Exception {
 		InMemoryRepository server2 = newRepo("server2");
 		TestRepository<InMemoryRepository> remote2 =
@@ -340,7 +424,8 @@
 	 * and returns UploadPack's output stream.
 	 */
 	private ByteArrayInputStream uploadPackV2Setup(RequestPolicy requestPolicy,
-			RefFilter refFilter, String... inputLines) throws Exception {
+			RefFilter refFilter, ProtocolV2Hook hook, String... inputLines)
+			throws Exception {
 
 		ByteArrayOutputStream send = new ByteArrayOutputStream();
 		PacketLineOut pckOut = new PacketLineOut(send);
@@ -361,6 +446,9 @@
 		if (refFilter != null)
 			up.setRefFilter(refFilter);
 		up.setExtraParameters(Sets.of("version=2"));
+		if (hook != null) {
+			up.setProtocolV2Hook(hook);
+		}
 
 		ByteArrayOutputStream recv = new ByteArrayOutputStream();
 		up.upload(new ByteArrayInputStream(send.toByteArray()), recv, null);
@@ -374,9 +462,10 @@
 	 * advertisement by the server.
 	 */
 	private ByteArrayInputStream uploadPackV2(RequestPolicy requestPolicy,
-			RefFilter refFilter, String... inputLines) throws Exception {
+			RefFilter refFilter, ProtocolV2Hook hook, String... inputLines)
+			throws Exception {
 		ByteArrayInputStream recvStream =
-			uploadPackV2Setup(requestPolicy, refFilter, inputLines);
+				uploadPackV2Setup(requestPolicy, refFilter, hook, inputLines);
 		PacketLineIn pckIn = new PacketLineIn(recvStream);
 
 		// drain capabilities
@@ -387,15 +476,33 @@
 	}
 
 	private ByteArrayInputStream uploadPackV2(String... inputLines) throws Exception {
-		return uploadPackV2(null, null, inputLines);
+		return uploadPackV2(null, null, null, inputLines);
+	}
+
+	private static class TestV2Hook implements ProtocolV2Hook {
+		private CapabilitiesV2Request capabilitiesRequest;
+
+		private LsRefsV2Request lsRefsRequest;
+
+		@Override
+		public void onCapabilities(CapabilitiesV2Request req) {
+			capabilitiesRequest = req;
+		}
+
+		@Override
+		public void onLsRefs(LsRefsV2Request req) {
+			lsRefsRequest = req;
+		}
 	}
 
 	@Test
 	public void testV2Capabilities() throws Exception {
+		TestV2Hook hook = new TestV2Hook();
 		ByteArrayInputStream recvStream =
-			uploadPackV2Setup(null, null, PacketLineIn.END);
+				uploadPackV2Setup(null, null, hook, PacketLineIn.END);
 		PacketLineIn pckIn = new PacketLineIn(recvStream);
 
+		assertThat(hook.capabilitiesRequest, notNullValue());
 		assertThat(pckIn.readString(), is("version 2"));
 		assertThat(
 			Arrays.asList(pckIn.readString(), pckIn.readString()),
@@ -413,7 +520,7 @@
 	public void testV2CapabilitiesAllowFilter() throws Exception {
 		server.getConfig().setBoolean("uploadpack", null, "allowfilter", true);
 		ByteArrayInputStream recvStream =
-			uploadPackV2Setup(null, null, PacketLineIn.END);
+				uploadPackV2Setup(null, null, null, PacketLineIn.END);
 		PacketLineIn pckIn = new PacketLineIn(recvStream);
 
 		assertThat(pckIn.readString(), is("version 2"));
@@ -426,12 +533,56 @@
 	}
 
 	@Test
-	@SuppressWarnings("boxing")
+	public void testV2CapabilitiesRefInWant() throws Exception {
+		server.getConfig().setBoolean("uploadpack", null, "allowrefinwant", true);
+		ByteArrayInputStream recvStream =
+				uploadPackV2Setup(null, null, null, PacketLineIn.END);
+		PacketLineIn pckIn = new PacketLineIn(recvStream);
+
+		assertThat(pckIn.readString(), is("version 2"));
+		assertThat(
+			Arrays.asList(pckIn.readString(), pckIn.readString()),
+			// TODO(jonathantanmy) This check overspecifies the
+			// order of the capabilities of "fetch".
+			hasItems("ls-refs", "fetch=ref-in-want shallow"));
+		assertTrue(pckIn.readString() == PacketLineIn.END);
+	}
+
+	@Test
+	public void testV2CapabilitiesRefInWantNotAdvertisedIfUnallowed() throws Exception {
+		server.getConfig().setBoolean("uploadpack", null, "allowrefinwant", false);
+		ByteArrayInputStream recvStream =
+				uploadPackV2Setup(null, null, null, PacketLineIn.END);
+		PacketLineIn pckIn = new PacketLineIn(recvStream);
+
+		assertThat(pckIn.readString(), is("version 2"));
+		assertThat(
+			Arrays.asList(pckIn.readString(), pckIn.readString()),
+			hasItems("ls-refs", "fetch=shallow"));
+		assertTrue(pckIn.readString() == PacketLineIn.END);
+	}
+
+	@Test
+	public void testV2CapabilitiesRefInWantNotAdvertisedIfAdvertisingForbidden() throws Exception {
+		server.getConfig().setBoolean("uploadpack", null, "allowrefinwant", true);
+		server.getConfig().setBoolean("uploadpack", null, "advertiserefinwant", false);
+		ByteArrayInputStream recvStream =
+				uploadPackV2Setup(null, null, null, PacketLineIn.END);
+		PacketLineIn pckIn = new PacketLineIn(recvStream);
+
+		assertThat(pckIn.readString(), is("version 2"));
+		assertThat(
+			Arrays.asList(pckIn.readString(), pckIn.readString()),
+			hasItems("ls-refs", "fetch=shallow"));
+		assertTrue(pckIn.readString() == PacketLineIn.END);
+	}
+
+	@Test
 	public void testV2EmptyRequest() throws Exception {
 		ByteArrayInputStream recvStream = uploadPackV2(PacketLineIn.END);
 		// Verify that there is nothing more after the capability
 		// advertisement.
-		assertThat(recvStream.available(), is(0));
+		assertEquals(0, recvStream.available());
 	}
 
 	@Test
@@ -442,9 +593,12 @@
 		RevTag tag = remote.tag("tag", tip);
 		remote.update("refs/tags/tag", tag);
 
-		ByteArrayInputStream recvStream = uploadPackV2("command=ls-refs\n", PacketLineIn.END);
+		TestV2Hook hook = new TestV2Hook();
+		ByteArrayInputStream recvStream = uploadPackV2(null, null, hook,
+				"command=ls-refs\n", PacketLineIn.END);
 		PacketLineIn pckIn = new PacketLineIn(recvStream);
 
+		assertThat(hook.lsRefsRequest, notNullValue());
 		assertThat(pckIn.readString(), is(tip.toObjectId().getName() + " HEAD"));
 		assertThat(pckIn.readString(), is(tip.toObjectId().getName() + " refs/heads/master"));
 		assertThat(pckIn.readString(), is(tag.toObjectId().getName() + " refs/tags/tag"));
@@ -579,6 +733,10 @@
 				new StringWriter(), NullOutputStream.INSTANCE);
 		PackParser pp = client.newObjectInserter().newPackParser(sb);
 		pp.parse(NullProgressMonitor.INSTANCE);
+
+		// Ensure that there is nothing left in the stream.
+		assertEquals(-1, recvStream.read());
+
 		return pp.getReceivedPackStatistics();
 	}
 
@@ -592,6 +750,7 @@
 		uploadPackV2(
 			RequestPolicy.ADVERTISED,
 			null,
+			null,
 			"command=fetch\n",
 			PacketLineIn.DELIM,
 			"want " + advertized.name() + "\n",
@@ -604,6 +763,7 @@
 		uploadPackV2(
 			RequestPolicy.ADVERTISED,
 			null,
+			null,
 			"command=fetch\n",
 			PacketLineIn.DELIM,
 			"want " + unadvertized.name() + "\n",
@@ -621,6 +781,7 @@
 		uploadPackV2(
 			RequestPolicy.REACHABLE_COMMIT,
 			null,
+			null,
 			"command=fetch\n",
 			PacketLineIn.DELIM,
 			"want " + reachable.name() + "\n",
@@ -633,6 +794,7 @@
 		uploadPackV2(
 			RequestPolicy.REACHABLE_COMMIT,
 			null,
+			null,
 			"command=fetch\n",
 			PacketLineIn.DELIM,
 			"want " + unreachable.name() + "\n",
@@ -649,6 +811,7 @@
 		uploadPackV2(
 			RequestPolicy.TIP,
 			new RejectAllRefFilter(),
+			null,
 			"command=fetch\n",
 			PacketLineIn.DELIM,
 			"want " + tip.name() + "\n",
@@ -661,6 +824,7 @@
 		uploadPackV2(
 			RequestPolicy.TIP,
 			new RejectAllRefFilter(),
+			null,
 			"command=fetch\n",
 			PacketLineIn.DELIM,
 			"want " + parentOfTip.name() + "\n",
@@ -678,6 +842,7 @@
 		uploadPackV2(
 			RequestPolicy.REACHABLE_COMMIT_TIP,
 			new RejectAllRefFilter(),
+			null,
 			"command=fetch\n",
 			PacketLineIn.DELIM,
 			"want " + parentOfTip.name() + "\n",
@@ -690,6 +855,7 @@
 		uploadPackV2(
 			RequestPolicy.REACHABLE_COMMIT_TIP,
 			new RejectAllRefFilter(),
+			null,
 			"command=fetch\n",
 			PacketLineIn.DELIM,
 			"want " + unreachable.name() + "\n",
@@ -704,6 +870,7 @@
 		uploadPackV2(
 			RequestPolicy.ANY,
 			null,
+			null,
 			"command=fetch\n",
 			PacketLineIn.DELIM,
 			"want " + unreachable.name() + "\n",
@@ -1078,6 +1245,216 @@
 			PacketLineIn.END);
 	}
 
+	@Test
+	public void testV2FetchWantRefIfNotAllowed() throws Exception {
+		RevCommit one = remote.commit().message("1").create();
+		remote.update("one", one);
+
+		try {
+			uploadPackV2(
+				"command=fetch\n",
+				PacketLineIn.DELIM,
+				"want-ref refs/heads/one\n",
+				"done\n",
+				PacketLineIn.END);
+		} catch (PackProtocolException e) {
+			assertThat(
+				e.getMessage(),
+				containsString("unexpected want-ref refs/heads/one"));
+			return;
+		}
+		fail("expected PackProtocolException");
+	}
+
+	@Test
+	public void testV2FetchWantRef() throws Exception {
+		RevCommit one = remote.commit().message("1").create();
+		RevCommit two = remote.commit().message("2").create();
+		RevCommit three = remote.commit().message("3").create();
+		remote.update("one", one);
+		remote.update("two", two);
+		remote.update("three", three);
+
+		server.getConfig().setBoolean("uploadpack", null, "allowrefinwant", true);
+
+		ByteArrayInputStream recvStream = uploadPackV2(
+			"command=fetch\n",
+			PacketLineIn.DELIM,
+			"want-ref refs/heads/one\n",
+			"want-ref refs/heads/two\n",
+			"done\n",
+			PacketLineIn.END);
+		PacketLineIn pckIn = new PacketLineIn(recvStream);
+		assertThat(pckIn.readString(), is("wanted-refs"));
+		assertThat(
+				Arrays.asList(pckIn.readString(), pckIn.readString()),
+				hasItems(
+					one.toObjectId().getName() + " refs/heads/one",
+					two.toObjectId().getName() + " refs/heads/two"));
+		assertThat(pckIn.readString(), theInstance(PacketLineIn.DELIM));
+		assertThat(pckIn.readString(), is("packfile"));
+		parsePack(recvStream);
+
+		assertTrue(client.hasObject(one.toObjectId()));
+		assertTrue(client.hasObject(two.toObjectId()));
+		assertFalse(client.hasObject(three.toObjectId()));
+	}
+
+	@Test
+	public void testV2FetchBadWantRef() throws Exception {
+		RevCommit one = remote.commit().message("1").create();
+		remote.update("one", one);
+
+		server.getConfig().setBoolean("uploadpack", null, "allowrefinwant", true);
+
+		try {
+			uploadPackV2(
+				"command=fetch\n",
+				PacketLineIn.DELIM,
+				"want-ref refs/heads/one\n",
+				"want-ref refs/heads/nonExistentRef\n",
+				"done\n",
+				PacketLineIn.END);
+		} catch (PackProtocolException e) {
+			assertThat(
+				e.getMessage(),
+				containsString("Invalid ref name: refs/heads/nonExistentRef"));
+			return;
+		}
+		fail("expected PackProtocolException");
+	}
+
+	@Test
+	public void testV2FetchMixedWantRef() throws Exception {
+		RevCommit one = remote.commit().message("1").create();
+		RevCommit two = remote.commit().message("2").create();
+		RevCommit three = remote.commit().message("3").create();
+		remote.update("one", one);
+		remote.update("two", two);
+		remote.update("three", three);
+
+		server.getConfig().setBoolean("uploadpack", null, "allowrefinwant", true);
+
+		ByteArrayInputStream recvStream = uploadPackV2(
+			"command=fetch\n",
+			PacketLineIn.DELIM,
+			"want-ref refs/heads/one\n",
+			"want " + two.toObjectId().getName() + "\n",
+			"done\n",
+			PacketLineIn.END);
+		PacketLineIn pckIn = new PacketLineIn(recvStream);
+		assertThat(pckIn.readString(), is("wanted-refs"));
+		assertThat(
+				pckIn.readString(),
+				is(one.toObjectId().getName() + " refs/heads/one"));
+		assertThat(pckIn.readString(), theInstance(PacketLineIn.DELIM));
+		assertThat(pckIn.readString(), is("packfile"));
+		parsePack(recvStream);
+
+		assertTrue(client.hasObject(one.toObjectId()));
+		assertTrue(client.hasObject(two.toObjectId()));
+		assertFalse(client.hasObject(three.toObjectId()));
+	}
+
+	@Test
+	public void testV2FetchWantRefWeAlreadyHave() throws Exception {
+		RevCommit one = remote.commit().message("1").create();
+		remote.update("one", one);
+
+		server.getConfig().setBoolean("uploadpack", null, "allowrefinwant", true);
+
+		ByteArrayInputStream recvStream = uploadPackV2(
+			"command=fetch\n",
+			PacketLineIn.DELIM,
+			"want-ref refs/heads/one\n",
+			"have " + one.toObjectId().getName(),
+			"done\n",
+			PacketLineIn.END);
+		PacketLineIn pckIn = new PacketLineIn(recvStream);
+
+		// The client still needs to know the hash of the object that
+		// refs/heads/one points to, even though it already has the
+		// object ...
+		assertThat(pckIn.readString(), is("wanted-refs"));
+		assertThat(
+				pckIn.readString(),
+				is(one.toObjectId().getName() + " refs/heads/one"));
+		assertThat(pckIn.readString(), theInstance(PacketLineIn.DELIM));
+
+		// ... but the client does not need the object itself.
+		assertThat(pckIn.readString(), is("packfile"));
+		parsePack(recvStream);
+		assertFalse(client.hasObject(one.toObjectId()));
+	}
+
+	@Test
+	public void testV2FetchWantRefAndDeepen() throws Exception {
+		RevCommit parent = remote.commit().message("parent").create();
+		RevCommit child = remote.commit().message("x").parent(parent).create();
+		remote.update("branch1", child);
+
+		server.getConfig().setBoolean("uploadpack", null, "allowrefinwant", true);
+
+		ByteArrayInputStream recvStream = uploadPackV2(
+			"command=fetch\n",
+			PacketLineIn.DELIM,
+			"want-ref refs/heads/branch1\n",
+			"deepen 1\n",
+			"done\n",
+			PacketLineIn.END);
+		PacketLineIn pckIn = new PacketLineIn(recvStream);
+
+		// shallow-info appears first, then wanted-refs.
+		assertThat(pckIn.readString(), is("shallow-info"));
+		assertThat(pckIn.readString(), is("shallow " + child.toObjectId().getName()));
+		assertThat(pckIn.readString(), theInstance(PacketLineIn.DELIM));
+		assertThat(pckIn.readString(), is("wanted-refs"));
+		assertThat(pckIn.readString(), is(child.toObjectId().getName() + " refs/heads/branch1"));
+		assertThat(pckIn.readString(), theInstance(PacketLineIn.DELIM));
+		assertThat(pckIn.readString(), is("packfile"));
+		parsePack(recvStream);
+		assertTrue(client.hasObject(child.toObjectId()));
+		assertFalse(client.hasObject(parent.toObjectId()));
+	}
+
+	@Test
+	public void testV2FetchMissingShallow() throws Exception {
+		RevCommit one = remote.commit().message("1").create();
+		RevCommit two = remote.commit().message("2").parent(one).create();
+		RevCommit three = remote.commit().message("3").parent(two).create();
+		remote.update("three", three);
+
+		server.getConfig().setBoolean("uploadpack", null, "allowrefinwant",
+				true);
+
+		ByteArrayInputStream recvStream = uploadPackV2("command=fetch\n",
+				PacketLineIn.DELIM,
+				"want-ref refs/heads/three\n",
+				"deepen 3",
+				"shallow 0123012301230123012301230123012301230123",
+				"shallow " + two.getName() + '\n',
+				"done\n",
+				PacketLineIn.END);
+		PacketLineIn pckIn = new PacketLineIn(recvStream);
+
+		assertThat(pckIn.readString(), is("shallow-info"));
+		assertThat(pckIn.readString(),
+				is("shallow " + one.toObjectId().getName()));
+		assertThat(pckIn.readString(),
+				is("unshallow " + two.toObjectId().getName()));
+		assertThat(pckIn.readString(), theInstance(PacketLineIn.DELIM));
+		assertThat(pckIn.readString(), is("wanted-refs"));
+		assertThat(pckIn.readString(),
+				is(three.toObjectId().getName() + " refs/heads/three"));
+		assertThat(pckIn.readString(), theInstance(PacketLineIn.DELIM));
+		assertThat(pckIn.readString(), is("packfile"));
+		parsePack(recvStream);
+
+		assertTrue(client.hasObject(one.toObjectId()));
+		assertTrue(client.hasObject(two.toObjectId()));
+		assertTrue(client.hasObject(three.toObjectId()));
+	}
+
 	private static class RejectAllRefFilter implements RefFilter {
 		@Override
 		public Map<String, Ref> filter(Map<String, Ref> refs) {
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/WalkEncryptionTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/WalkEncryptionTest.java
index 33e2529..f2fb022 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/WalkEncryptionTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/WalkEncryptionTest.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.transport;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.transport.WalkEncryptionTest.Util.cryptoCipherListPBE;
 import static org.eclipse.jgit.transport.WalkEncryptionTest.Util.cryptoCipherListTrans;
 import static org.eclipse.jgit.transport.WalkEncryptionTest.Util.folderDelete;
@@ -360,7 +360,7 @@
 		 * @throws Exception
 		 */
 		static String textRead(File file) throws Exception {
-			return new String(Files.readAllBytes(file.toPath()), CHARSET);
+			return new String(Files.readAllBytes(file.toPath()), UTF_8);
 		}
 
 		/**
@@ -371,7 +371,7 @@
 		 * @throws Exception
 		 */
 		static void textWrite(File file, String text) throws Exception {
-			Files.write(file.toPath(), text.getBytes(CHARSET));
+			Files.write(file.toPath(), text.getBytes(UTF_8));
 		}
 
 		static void verifyFileContent(File fileOne, File fileTwo)
@@ -420,7 +420,7 @@
 				c.setConnectTimeout(500);
 				c.setReadTimeout(500);
 				try (BufferedReader reader = new BufferedReader(
-						new InputStreamReader(c.getInputStream()))) {
+						new InputStreamReader(c.getInputStream(), UTF_8))) {
 					return reader.readLine();
 				}
 			} catch (UnknownHostException | SocketTimeoutException e) {
@@ -738,7 +738,7 @@
 			AmazonS3 s3 = new AmazonS3(props);
 			String file = JGIT_USER + "-" + UUID.randomUUID().toString();
 			String path = JGIT_REMOTE_DIR + "/" + file;
-			s3.put(bucket, path, file.getBytes(CHARSET));
+			s3.put(bucket, path, file.getBytes(UTF_8));
 			s3.delete(bucket, path);
 		}
 
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/CanonicalTreeParserTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/CanonicalTreeParserTest.java
index 6195e64..41bd355 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/CanonicalTreeParserTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/CanonicalTreeParserTest.java
@@ -43,6 +43,7 @@
 
 package org.eclipse.jgit.treewalk;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.lib.FileMode.REGULAR_FILE;
 import static org.eclipse.jgit.lib.FileMode.SYMLINK;
 import static org.junit.Assert.assertEquals;
@@ -110,7 +111,7 @@
 	}
 
 	private String path() {
-		return RawParseUtils.decode(Constants.CHARSET, ctp.path,
+		return RawParseUtils.decode(UTF_8, ctp.path,
 				ctp.pathOffset, ctp.pathLen);
 	}
 
@@ -370,7 +371,7 @@
 		final String name = b.toString();
 		ctp.reset(entry(m644, name, hash_a));
 		assertFalse(ctp.eof());
-		assertEquals(name, RawParseUtils.decode(Constants.CHARSET, ctp.path,
+		assertEquals(name, RawParseUtils.decode(UTF_8, ctp.path,
 				ctp.pathOffset, ctp.pathLen));
 	}
 
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/FileTreeIteratorTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/FileTreeIteratorTest.java
index 0e009b9..33e32cd 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/FileTreeIteratorTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/FileTreeIteratorTest.java
@@ -43,6 +43,7 @@
 
 package org.eclipse.jgit.treewalk;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
@@ -331,7 +332,7 @@
 		DirCacheEntry dce = db.readDirCache().getEntry("symlink");
 		dce.setFileMode(FileMode.SYMLINK);
 		try (ObjectReader objectReader = db.newObjectReader()) {
-			DirCacheCheckout.checkoutEntry(db, dce, objectReader);
+			DirCacheCheckout.checkoutEntry(db, dce, objectReader, false, null);
 
 			FileTreeIterator fti = new FileTreeIterator(trash, db.getFS(),
 					db.getConfig().get(WorkingTreeOptions.KEY));
@@ -822,6 +823,6 @@
 	}
 
 	private static String nameOf(AbstractTreeIterator i) {
-		return RawParseUtils.decode(Constants.CHARSET, i.path, 0, i.pathLen);
+		return RawParseUtils.decode(UTF_8, i.path, 0, i.pathLen);
 	}
 }
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/filter/PathFilterGroupTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/filter/PathFilterGroupTest.java
index 71a2f32..15d03d3 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/filter/PathFilterGroupTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/filter/PathFilterGroupTest.java
@@ -231,8 +231,8 @@
 			}
 		}
 
-		String[] e = expect.toArray(new String[expect.size()]);
-		String[] a = actual.toArray(new String[actual.size()]);
+		String[] e = expect.toArray(new String[0]);
+		String[] a = actual.toArray(new String[0]);
 		Arrays.sort(e);
 		Arrays.sort(a);
 		assertArrayEquals(e, a);
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/FilterCommandsTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/FilterCommandsTest.java
index 0d31811..8dfdd0f 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/FilterCommandsTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/FilterCommandsTest.java
@@ -85,6 +85,8 @@
 				public int run() throws IOException {
 					int b = in.read();
 					if (b == -1) {
+						in.close();
+						out.close();
 						return b;
 					}
 					out.write(prefix);
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/RawParseUtilsTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/RawParseUtilsTest.java
index 7bd9adb..3aae59e 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/RawParseUtilsTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/RawParseUtilsTest.java
@@ -52,7 +52,24 @@
 import org.eclipse.jgit.lib.Constants;
 import org.junit.Test;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 public class RawParseUtilsTest {
+	String commit = "tree e3a1035abd2b319bb01e57d69b0ba6cab289297e\n" +
+		"parent 54e895b87c0768d2317a2b17062e3ad9f76a8105\n" +
+		"committer A U Thor <author@xample.com 1528968566 +0200\n" +
+		"gpgsig -----BEGIN PGP SIGNATURE-----\n" +
+		" \n" +
+		" wsBcBAABCAAQBQJbGB4pCRBK7hj4Ov3rIwAAdHIIAENrvz23867ZgqrmyPemBEZP\n" +
+		" U24B1Tlq/DWvce2buaxmbNQngKZ0pv2s8VMc11916WfTIC9EKvioatmpjduWvhqj\n" +
+		" znQTFyiMor30pyYsfrqFuQZvqBW01o8GEWqLg8zjf9Rf0R3LlOEw86aT8CdHRlm6\n" +
+		" wlb22xb8qoX4RB+LYfz7MhK5F+yLOPXZdJnAVbuyoMGRnDpwdzjL5Hj671+XJxN5\n" +
+		" SasRdhxkkfw/ZnHxaKEc4juMz8Nziz27elRwhOQqlTYoXNJnsV//wy5Losd7aKi1\n" +
+		" xXXyUpndEOmT0CIcKHrN/kbYoVL28OJaxoBuva3WYQaRrzEe3X02NMxZe9gkSqA=\n" +
+		" =TClh\n" +
+		" -----END PGP SIGNATURE-----\n" +
+		"some other header\n\n" +
+		"commit message";
 
 	@Test
 	public void testParseEncoding_ISO8859_1_encoding() {
@@ -79,4 +96,30 @@
 		}
 	}
 
+	@Test
+	public void testHeaderStart() {
+		byte[] headerName = "some".getBytes(UTF_8);
+		byte[] commitBytes = commit.getBytes(UTF_8);
+		assertEquals(625, RawParseUtils.headerStart(headerName, commitBytes, 0));
+		assertEquals(625, RawParseUtils.headerStart(headerName, commitBytes, 4));
+
+		byte[] missingHeaderName = "missing".getBytes(UTF_8);
+		assertEquals(-1, RawParseUtils.headerStart(missingHeaderName,
+							   commitBytes, 0));
+
+		byte[] fauxHeaderName = "other".getBytes(UTF_8);
+		assertEquals(-1, RawParseUtils.headerStart(fauxHeaderName, commitBytes, 625 + 4));
+	}
+
+	@Test
+	public void testHeaderEnd() {
+		byte[] commitBytes = commit.getBytes(UTF_8);
+		int[] expected = new int[] {45, 93, 148, 619, 637};
+		int start = 0;
+		for (int i = 0; i < expected.length; i++) {
+			start = RawParseUtils.headerEnd(commitBytes, start);
+			assertEquals(expected[i], start);
+			start += 1;
+		}
+	}
 }
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/RawSubStringPatternTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/RawSubStringPatternTest.java
index a748b52..e8566d2 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/RawSubStringPatternTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/RawSubStringPatternTest.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.util;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 
@@ -93,7 +93,7 @@
 	}
 
 	private static RawCharSequence raw(String text) {
-		byte[] bytes = text.getBytes(CHARSET);
+		byte[] bytes = text.getBytes(UTF_8);
 		return new RawCharSequence(bytes, 0, bytes.length);
 	}
 }
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/io/AutoLFInputStreamTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/io/AutoLFInputStreamTest.java
index 5058165..37ca951 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/io/AutoLFInputStreamTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/io/AutoLFInputStreamTest.java
@@ -44,7 +44,7 @@
 
 package org.eclipse.jgit.util.io;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 
 import java.io.ByteArrayInputStream;
@@ -132,6 +132,6 @@
 	}
 
 	private static byte[] asBytes(String in) {
-		return in.getBytes(CHARSET);
+		return in.getBytes(UTF_8);
 	}
 }
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/sha1/SHA1Test.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/sha1/SHA1Test.java
index 3c612e1..e6045a9 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/sha1/SHA1Test.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/sha1/SHA1Test.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.util.sha1;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
@@ -95,15 +95,15 @@
 				.fromString("a9993e364706816aba3e25717850c26c9cd0d89d");
 
 		MessageDigest m = MessageDigest.getInstance("SHA-1");
-		m.update(TEST1.getBytes(CHARSET));
+		m.update(TEST1.getBytes(UTF_8));
 		ObjectId m1 = ObjectId.fromRaw(m.digest());
 
 		SHA1 s = SHA1.newInstance();
-		s.update(TEST1.getBytes(CHARSET));
+		s.update(TEST1.getBytes(UTF_8));
 		ObjectId s1 = ObjectId.fromRaw(s.digest());
 
 		s.reset();
-		s.update(TEST1.getBytes(CHARSET));
+		s.update(TEST1.getBytes(UTF_8));
 		ObjectId s2 = s.toObjectId();
 
 		assertEquals(m1, s1);
@@ -117,15 +117,15 @@
 				.fromString("84983e441c3bd26ebaae4aa1f95129e5e54670f1");
 
 		MessageDigest m = MessageDigest.getInstance("SHA-1");
-		m.update(TEST2.getBytes(CHARSET));
+		m.update(TEST2.getBytes(UTF_8));
 		ObjectId m1 = ObjectId.fromRaw(m.digest());
 
 		SHA1 s = SHA1.newInstance();
-		s.update(TEST2.getBytes(CHARSET));
+		s.update(TEST2.getBytes(UTF_8));
 		ObjectId s1 = ObjectId.fromRaw(s.digest());
 
 		s.reset();
-		s.update(TEST2.getBytes(CHARSET));
+		s.update(TEST2.getBytes(UTF_8));
 		ObjectId s2 = s.toObjectId();
 
 		assertEquals(m1, s1);
diff --git a/org.eclipse.jgit.ui/META-INF/MANIFEST.MF b/org.eclipse.jgit.ui/META-INF/MANIFEST.MF
index 7667af4..5ee9d01 100644
--- a/org.eclipse.jgit.ui/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.ui/META-INF/MANIFEST.MF
@@ -4,14 +4,14 @@
 Bundle-Name: %plugin_name
 Automatic-Module-Name: org.eclipse.jgit.ui
 Bundle-SymbolicName: org.eclipse.jgit.ui
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
 Bundle-Vendor: %provider_name
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
-Export-Package: org.eclipse.jgit.awtui;version="5.0.4"
-Import-Package: org.eclipse.jgit.errors;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.lib;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.nls;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.revplot;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.revwalk;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.transport;version="[5.0.4,5.1.0)",
- org.eclipse.jgit.util;version="[5.0.4,5.1.0)"
+Export-Package: org.eclipse.jgit.awtui;version="5.1.2"
+Import-Package: org.eclipse.jgit.errors;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.lib;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.nls;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.revplot;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.revwalk;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.transport;version="[5.1.2,5.2.0)",
+ org.eclipse.jgit.util;version="[5.1.2,5.2.0)"
diff --git a/org.eclipse.jgit.ui/pom.xml b/org.eclipse.jgit.ui/pom.xml
index 7d10c09..0f9d486 100644
--- a/org.eclipse.jgit.ui/pom.xml
+++ b/org.eclipse.jgit.ui/pom.xml
@@ -52,7 +52,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>org.eclipse.jgit-parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <artifactId>org.eclipse.jgit.ui</artifactId>
diff --git a/org.eclipse.jgit/.settings/.api_filters b/org.eclipse.jgit/.settings/.api_filters
index 089510a..282d7e8 100644
--- a/org.eclipse.jgit/.settings/.api_filters
+++ b/org.eclipse.jgit/.settings/.api_filters
@@ -3,8 +3,8 @@
     <resource path="META-INF/MANIFEST.MF">
         <filter id="924844039">
             <message_arguments>
-                <message_argument value="5.0.4"/>
-                <message_argument value="5.0.0"/>
+                <message_argument value="5.1.2"/>
+                <message_argument value="5.1.0"/>
             </message_arguments>
         </filter>
     </resource>
@@ -24,22 +24,4 @@
             </message_arguments>
         </filter>
     </resource>
-    <resource path="src/org/eclipse/jgit/util/FS.java" type="org.eclipse.jgit.util.FS">
-        <filter id="1141899266">
-            <message_arguments>
-                <message_argument value="4.7"/>
-                <message_argument value="5.0"/>
-                <message_argument value="createNewFileAtomic(File)"/>
-            </message_arguments>
-        </filter>
-    </resource>
-    <resource path="src/org/eclipse/jgit/util/FS.java" type="org.eclipse.jgit.util.FS$LockToken">
-        <filter id="1141899266">
-            <message_arguments>
-                <message_argument value="4.7"/>
-                <message_argument value="5.0"/>
-                <message_argument value="LockToken"/>
-            </message_arguments>
-        </filter>
-    </resource>
 </component>
diff --git a/org.eclipse.jgit/META-INF/MANIFEST.MF b/org.eclipse.jgit/META-INF/MANIFEST.MF
index a8114d9..ca9c263 100644
--- a/org.eclipse.jgit/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit/META-INF/MANIFEST.MF
@@ -3,12 +3,12 @@
 Bundle-Name: %plugin_name
 Automatic-Module-Name: org.eclipse.jgit
 Bundle-SymbolicName: org.eclipse.jgit
-Bundle-Version: 5.0.4.qualifier
+Bundle-Version: 5.1.2.qualifier
 Bundle-Localization: plugin
 Bundle-Vendor: %provider_name
 Bundle-ActivationPolicy: lazy
-Export-Package: org.eclipse.jgit.annotations;version="5.0.4",
- org.eclipse.jgit.api;version="5.0.4";
+Export-Package: org.eclipse.jgit.annotations;version="5.1.2",
+ org.eclipse.jgit.api;version="5.1.2";
   uses:="org.eclipse.jgit.revwalk,
    org.eclipse.jgit.treewalk.filter,
    org.eclipse.jgit.diff,
@@ -22,52 +22,52 @@
    org.eclipse.jgit.submodule,
    org.eclipse.jgit.transport,
    org.eclipse.jgit.merge",
- org.eclipse.jgit.api.errors;version="5.0.4";uses:="org.eclipse.jgit.lib,org.eclipse.jgit.errors",
- org.eclipse.jgit.attributes;version="5.0.4",
- org.eclipse.jgit.blame;version="5.0.4";
+ org.eclipse.jgit.api.errors;version="5.1.2";uses:="org.eclipse.jgit.lib,org.eclipse.jgit.errors",
+ org.eclipse.jgit.attributes;version="5.1.2",
+ org.eclipse.jgit.blame;version="5.1.2";
   uses:="org.eclipse.jgit.lib,
    org.eclipse.jgit.revwalk,
    org.eclipse.jgit.treewalk.filter,
    org.eclipse.jgit.diff",
- org.eclipse.jgit.diff;version="5.0.4";
+ org.eclipse.jgit.diff;version="5.1.2";
   uses:="org.eclipse.jgit.patch,
    org.eclipse.jgit.lib,
    org.eclipse.jgit.treewalk,
    org.eclipse.jgit.revwalk,
    org.eclipse.jgit.treewalk.filter,
    org.eclipse.jgit.util",
- org.eclipse.jgit.dircache;version="5.0.4";
+ org.eclipse.jgit.dircache;version="5.1.2";
   uses:="org.eclipse.jgit.lib,
    org.eclipse.jgit.treewalk,
    org.eclipse.jgit.util,
    org.eclipse.jgit.events,
    org.eclipse.jgit.attributes",
- org.eclipse.jgit.errors;version="5.0.4";
+ org.eclipse.jgit.errors;version="5.1.2";
   uses:="org.eclipse.jgit.lib,
    org.eclipse.jgit.internal.storage.pack,
    org.eclipse.jgit.transport,
    org.eclipse.jgit.dircache",
- org.eclipse.jgit.events;version="5.0.4";uses:="org.eclipse.jgit.lib",
- org.eclipse.jgit.fnmatch;version="5.0.4",
- org.eclipse.jgit.gitrepo;version="5.0.4";
+ org.eclipse.jgit.events;version="5.1.2";uses:="org.eclipse.jgit.lib",
+ org.eclipse.jgit.fnmatch;version="5.1.2",
+ org.eclipse.jgit.gitrepo;version="5.1.2";
   uses:="org.eclipse.jgit.api,
    org.eclipse.jgit.lib,
    org.eclipse.jgit.revwalk,
    org.xml.sax.helpers,
    org.xml.sax",
- org.eclipse.jgit.gitrepo.internal;version="5.0.4";x-internal:=true,
- org.eclipse.jgit.hooks;version="5.0.4";uses:="org.eclipse.jgit.lib",
- org.eclipse.jgit.ignore;version="5.0.4",
- org.eclipse.jgit.ignore.internal;version="5.0.4";x-friends:="org.eclipse.jgit.test",
- org.eclipse.jgit.internal;version="5.0.4";x-friends:="org.eclipse.jgit.test,org.eclipse.jgit.http.test",
- org.eclipse.jgit.internal.fsck;version="5.0.4";x-friends:="org.eclipse.jgit.test",
- org.eclipse.jgit.internal.ketch;version="5.0.4";x-friends:="org.eclipse.jgit.junit,org.eclipse.jgit.test,org.eclipse.jgit.pgm",
- org.eclipse.jgit.internal.storage.dfs;version="5.0.4";
+ org.eclipse.jgit.gitrepo.internal;version="5.1.2";x-internal:=true,
+ org.eclipse.jgit.hooks;version="5.1.2";uses:="org.eclipse.jgit.lib",
+ org.eclipse.jgit.ignore;version="5.1.2",
+ org.eclipse.jgit.ignore.internal;version="5.1.2";x-friends:="org.eclipse.jgit.test",
+ org.eclipse.jgit.internal;version="5.1.2";x-friends:="org.eclipse.jgit.test,org.eclipse.jgit.http.test",
+ org.eclipse.jgit.internal.fsck;version="5.1.2";x-friends:="org.eclipse.jgit.test",
+ org.eclipse.jgit.internal.ketch;version="5.1.2";x-friends:="org.eclipse.jgit.junit,org.eclipse.jgit.test,org.eclipse.jgit.pgm",
+ org.eclipse.jgit.internal.storage.dfs;version="5.1.2";
   x-friends:="org.eclipse.jgit.test,
    org.eclipse.jgit.http.server,
    org.eclipse.jgit.http.test,
    org.eclipse.jgit.lfs.test",
- org.eclipse.jgit.internal.storage.file;version="5.0.4";
+ org.eclipse.jgit.internal.storage.file;version="5.1.2";
   x-friends:="org.eclipse.jgit.test,
    org.eclipse.jgit.junit,
    org.eclipse.jgit.junit.http,
@@ -75,12 +75,12 @@
    org.eclipse.jgit.lfs,
    org.eclipse.jgit.pgm,
    org.eclipse.jgit.pgm.test",
- org.eclipse.jgit.internal.storage.io;version="5.0.4";x-friends:="org.eclipse.jgit.junit,org.eclipse.jgit.test,org.eclipse.jgit.pgm",
- org.eclipse.jgit.internal.storage.pack;version="5.0.4";x-friends:="org.eclipse.jgit.junit,org.eclipse.jgit.test,org.eclipse.jgit.pgm",
- org.eclipse.jgit.internal.storage.reftable;version="5.0.4";
+ org.eclipse.jgit.internal.storage.io;version="5.1.2";x-friends:="org.eclipse.jgit.junit,org.eclipse.jgit.test,org.eclipse.jgit.pgm",
+ org.eclipse.jgit.internal.storage.pack;version="5.1.2";x-friends:="org.eclipse.jgit.junit,org.eclipse.jgit.test,org.eclipse.jgit.pgm",
+ org.eclipse.jgit.internal.storage.reftable;version="5.1.2";
   x-friends:="org.eclipse.jgit.http.test,org.eclipse.jgit.junit,org.eclipse.jgit.test,org.eclipse.jgit.pgm",
- org.eclipse.jgit.internal.storage.reftree;version="5.0.4";x-friends:="org.eclipse.jgit.junit,org.eclipse.jgit.test,org.eclipse.jgit.pgm",
- org.eclipse.jgit.lib;version="5.0.4";
+ org.eclipse.jgit.internal.storage.reftree;version="5.1.2";x-friends:="org.eclipse.jgit.junit,org.eclipse.jgit.test,org.eclipse.jgit.pgm",
+ org.eclipse.jgit.lib;version="5.1.2";
   uses:="org.eclipse.jgit.revwalk,
    org.eclipse.jgit.treewalk.filter,
    org.eclipse.jgit.util,
@@ -90,33 +90,33 @@
    org.eclipse.jgit.treewalk,
    org.eclipse.jgit.transport,
    org.eclipse.jgit.submodule",
- org.eclipse.jgit.lib.internal;version="5.0.4";x-internal:=true,
- org.eclipse.jgit.merge;version="5.0.4";
+ org.eclipse.jgit.lib.internal;version="5.1.2";x-internal:=true,
+ org.eclipse.jgit.merge;version="5.1.2";
   uses:="org.eclipse.jgit.lib,
    org.eclipse.jgit.treewalk,
    org.eclipse.jgit.revwalk,
    org.eclipse.jgit.diff,
    org.eclipse.jgit.dircache,
    org.eclipse.jgit.api",
- org.eclipse.jgit.nls;version="5.0.4",
- org.eclipse.jgit.notes;version="5.0.4";
+ org.eclipse.jgit.nls;version="5.1.2",
+ org.eclipse.jgit.notes;version="5.1.2";
   uses:="org.eclipse.jgit.lib,
    org.eclipse.jgit.treewalk,
    org.eclipse.jgit.revwalk,
    org.eclipse.jgit.merge",
- org.eclipse.jgit.patch;version="5.0.4";uses:="org.eclipse.jgit.lib,org.eclipse.jgit.diff",
- org.eclipse.jgit.revplot;version="5.0.4";uses:="org.eclipse.jgit.lib,org.eclipse.jgit.revwalk",
- org.eclipse.jgit.revwalk;version="5.0.4";
+ org.eclipse.jgit.patch;version="5.1.2";uses:="org.eclipse.jgit.lib,org.eclipse.jgit.diff",
+ org.eclipse.jgit.revplot;version="5.1.2";uses:="org.eclipse.jgit.lib,org.eclipse.jgit.revwalk",
+ org.eclipse.jgit.revwalk;version="5.1.2";
   uses:="org.eclipse.jgit.lib,
    org.eclipse.jgit.treewalk,
    org.eclipse.jgit.treewalk.filter,
    org.eclipse.jgit.diff,
    org.eclipse.jgit.revwalk.filter",
- org.eclipse.jgit.revwalk.filter;version="5.0.4";uses:="org.eclipse.jgit.revwalk,org.eclipse.jgit.lib,org.eclipse.jgit.util",
- org.eclipse.jgit.storage.file;version="5.0.4";uses:="org.eclipse.jgit.lib,org.eclipse.jgit.util",
- org.eclipse.jgit.storage.pack;version="5.0.4";uses:="org.eclipse.jgit.lib",
- org.eclipse.jgit.submodule;version="5.0.4";uses:="org.eclipse.jgit.lib,org.eclipse.jgit.treewalk.filter,org.eclipse.jgit.treewalk",
- org.eclipse.jgit.transport;version="5.0.4";
+ org.eclipse.jgit.revwalk.filter;version="5.1.2";uses:="org.eclipse.jgit.revwalk,org.eclipse.jgit.lib,org.eclipse.jgit.util",
+ org.eclipse.jgit.storage.file;version="5.1.2";uses:="org.eclipse.jgit.lib,org.eclipse.jgit.util",
+ org.eclipse.jgit.storage.pack;version="5.1.2";uses:="org.eclipse.jgit.lib",
+ org.eclipse.jgit.submodule;version="5.1.2";uses:="org.eclipse.jgit.lib,org.eclipse.jgit.treewalk.filter,org.eclipse.jgit.treewalk",
+ org.eclipse.jgit.transport;version="5.1.2";
   uses:="org.eclipse.jgit.transport.resolver,
    org.eclipse.jgit.revwalk,
    org.eclipse.jgit.internal.storage.pack,
@@ -128,24 +128,24 @@
    org.eclipse.jgit.transport.http,
    org.eclipse.jgit.errors,
    org.eclipse.jgit.storage.pack",
- org.eclipse.jgit.transport.http;version="5.0.4";uses:="javax.net.ssl",
- org.eclipse.jgit.transport.resolver;version="5.0.4";uses:="org.eclipse.jgit.lib,org.eclipse.jgit.transport",
- org.eclipse.jgit.treewalk;version="5.0.4";
+ org.eclipse.jgit.transport.http;version="5.1.2";uses:="javax.net.ssl",
+ org.eclipse.jgit.transport.resolver;version="5.1.2";uses:="org.eclipse.jgit.lib,org.eclipse.jgit.transport",
+ org.eclipse.jgit.treewalk;version="5.1.2";
   uses:="org.eclipse.jgit.lib,
    org.eclipse.jgit.revwalk,
    org.eclipse.jgit.attributes,
    org.eclipse.jgit.treewalk.filter,
    org.eclipse.jgit.util,
    org.eclipse.jgit.dircache",
- org.eclipse.jgit.treewalk.filter;version="5.0.4";uses:="org.eclipse.jgit.treewalk",
- org.eclipse.jgit.util;version="5.0.4";
+ org.eclipse.jgit.treewalk.filter;version="5.1.2";uses:="org.eclipse.jgit.treewalk",
+ org.eclipse.jgit.util;version="5.1.2";
   uses:="org.eclipse.jgit.lib,
    org.eclipse.jgit.transport.http,
    org.eclipse.jgit.storage.file,
    org.ietf.jgss",
- org.eclipse.jgit.util.io;version="5.0.4",
- org.eclipse.jgit.util.sha1;version="5.0.4",
- org.eclipse.jgit.util.time;version="5.0.4"
+ org.eclipse.jgit.util.io;version="5.1.2",
+ org.eclipse.jgit.util.sha1;version="5.1.2",
+ org.eclipse.jgit.util.time;version="5.1.2"
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
 Import-Package: com.googlecode.javaewah;version="[1.1.6,2.0.0)",
  com.jcraft.jsch;version="[0.1.37,0.2.0)",
diff --git a/org.eclipse.jgit/META-INF/SOURCE-MANIFEST.MF b/org.eclipse.jgit/META-INF/SOURCE-MANIFEST.MF
index b2d694a..86f3dd0 100644
--- a/org.eclipse.jgit/META-INF/SOURCE-MANIFEST.MF
+++ b/org.eclipse.jgit/META-INF/SOURCE-MANIFEST.MF
@@ -3,5 +3,5 @@
 Bundle-Name: org.eclipse.jgit - Sources
 Bundle-SymbolicName: org.eclipse.jgit.source
 Bundle-Vendor: Eclipse.org - JGit
-Bundle-Version: 5.0.4.qualifier
-Eclipse-SourceBundle: org.eclipse.jgit;version="5.0.4.qualifier";roots="."
+Bundle-Version: 5.1.2.qualifier
+Eclipse-SourceBundle: org.eclipse.jgit;version="5.1.2.qualifier";roots="."
diff --git a/org.eclipse.jgit/pom.xml b/org.eclipse.jgit/pom.xml
index 2b56d0a..4bed30c 100644
--- a/org.eclipse.jgit/pom.xml
+++ b/org.eclipse.jgit/pom.xml
@@ -53,7 +53,7 @@
   <parent>
     <groupId>org.eclipse.jgit</groupId>
     <artifactId>org.eclipse.jgit-parent</artifactId>
-    <version>5.0.4-SNAPSHOT</version>
+    <version>5.1.2-SNAPSHOT</version>
   </parent>
 
   <artifactId>org.eclipse.jgit</artifactId>
@@ -84,10 +84,6 @@
       <artifactId>JavaEWAH</artifactId>
     </dependency>
 
-    <dependency>
-      <groupId>org.apache.httpcomponents</groupId>
-      <artifactId>httpclient</artifactId>
-    </dependency>
 
     <dependency>
       <groupId>org.slf4j</groupId>
diff --git a/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties b/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties
index bbea8a3..3f1d212 100644
--- a/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties
+++ b/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties
@@ -582,6 +582,7 @@
 renameBranchFailedBecauseTag=Can not rename as Ref {0} is a tag
 renameBranchFailedUnknownReason=Rename failed with unknown reason
 renameBranchUnexpectedResult=Unexpected rename result {0}
+renameCancelled=Rename detection was cancelled
 renameFileFailed=Could not rename file {0} to {1}
 renamesAlreadyFound=Renames have already been found.
 renamesBreakingModifies=Breaking apart modified file pairs
@@ -765,8 +766,8 @@
 upstreamBranchName=branch ''{0}'' of {1}
 uriNotConfigured=Submodule URI not configured
 uriNotFound={0} not found
+uriNotFoundWithMessage={0} not found: {1}
 URINotSupported=URI not supported: {0}
-URLNotFound={0} not found
 userConfigFileInvalid=User config file {0} invalid {1}
 walkFailure=Walk failure.
 wantNotValid=want {0} not valid
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/api/CleanCommand.java b/org.eclipse.jgit/src/org/eclipse/jgit/api/CleanCommand.java
index 0d9fe41..43085dc 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/api/CleanCommand.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/api/CleanCommand.java
@@ -136,7 +136,7 @@
 		} catch (IOException e) {
 			throw new JGitInternalException(e.getMessage(), e);
 		} finally {
-			if (!files.isEmpty()) {
+			if (!dryRun && !files.isEmpty()) {
 				repo.fireEvent(new WorkingTreeModifiedEvent(null, files));
 			}
 		}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/api/RebaseCommand.java b/org.eclipse.jgit/src/org/eclipse/jgit/api/RebaseCommand.java
index 98c16b8..1783c41 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/api/RebaseCommand.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/api/RebaseCommand.java
@@ -275,9 +275,7 @@
 					throw new JGitInternalException(ioe.getMessage(), ioe);
 				}
 			case PROCESS_STEPS:
-				// fall through
 			case SKIP:
-				// fall through
 			case CONTINUE:
 				String upstreamCommitId = rebaseState.readFile(ONTO);
 				try {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/api/SubmoduleAddCommand.java b/org.eclipse.jgit/src/org/eclipse/jgit/api/SubmoduleAddCommand.java
index 9d9626f..244a156 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/api/SubmoduleAddCommand.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/api/SubmoduleAddCommand.java
@@ -77,6 +77,8 @@
 public class SubmoduleAddCommand extends
 		TransportCommand<SubmoduleAddCommand, Repository> {
 
+	private String name;
+
 	private String path;
 
 	private String uri;
@@ -94,6 +96,18 @@
 	}
 
 	/**
+	 * Set the submodule name
+	 *
+	 * @param name
+	 * @return this command
+	 * @since 5.1
+	 */
+	public SubmoduleAddCommand setName(String name) {
+		this.name = name;
+		return this;
+	}
+
+	/**
 	 * Set repository-relative path of submodule
 	 *
 	 * @param path
@@ -161,9 +175,28 @@
 			throw new IllegalArgumentException(JGitText.get().pathNotConfigured);
 		if (uri == null || uri.length() == 0)
 			throw new IllegalArgumentException(JGitText.get().uriNotConfigured);
+		if (name == null || name.length() == 0) {
+			// Use the path as the default.
+			name = path;
+		}
+		if (name.contains("/../") || name.contains("\\..\\") //$NON-NLS-1$ //$NON-NLS-2$
+				|| name.startsWith("../") || name.startsWith("..\\") //$NON-NLS-1$ //$NON-NLS-2$
+				|| name.endsWith("/..") || name.endsWith("\\..")) { //$NON-NLS-1$ //$NON-NLS-2$
+			// Submodule names are used to store the submodule repositories
+			// under $GIT_DIR/modules. Having ".." in submodule names makes a
+			// vulnerability (CVE-2018-11235
+			// https://bugs.eclipse.org/bugs/show_bug.cgi?id=535027#c0)
+			// Reject the names with them. The callers need to make sure the
+			// names free from these. We don't automatically replace these
+			// characters or canonicalize by regarding the name as a file path.
+			// Since Path class is platform dependent, we manually check '/' and
+			// '\\' patterns here.
+			throw new IllegalArgumentException(MessageFormat
+					.format(JGitText.get().invalidNameContainsDotDot, name));
+		}
 
 		try {
-			SubmoduleValidator.assertValidSubmoduleName(path);
+			SubmoduleValidator.assertValidSubmoduleName(name);
 			SubmoduleValidator.assertValidSubmodulePath(path);
 			SubmoduleValidator.assertValidSubmoduleUri(uri);
 		} catch (SubmoduleValidator.SubmoduleValidationException e) {
@@ -202,7 +235,7 @@
 
 		// Save submodule URL to parent repository's config
 		StoredConfig config = repo.getConfig();
-		config.setString(ConfigConstants.CONFIG_SUBMODULE_SECTION, path,
+		config.setString(ConfigConstants.CONFIG_SUBMODULE_SECTION, name,
 				ConfigConstants.CONFIG_KEY_URL, resolvedUri);
 		try {
 			config.save();
@@ -216,9 +249,9 @@
 		try {
 			modulesConfig.load();
 			modulesConfig.setString(ConfigConstants.CONFIG_SUBMODULE_SECTION,
-					path, ConfigConstants.CONFIG_KEY_PATH, path);
+					name, ConfigConstants.CONFIG_KEY_PATH, path);
 			modulesConfig.setString(ConfigConstants.CONFIG_SUBMODULE_SECTION,
-					path, ConfigConstants.CONFIG_KEY_URL, uri);
+					name, ConfigConstants.CONFIG_KEY_URL, uri);
 			modulesConfig.save();
 		} catch (IOException e) {
 			throw new JGitInternalException(e.getMessage(), e);
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/api/SubmoduleDeinitCommand.java b/org.eclipse.jgit/src/org/eclipse/jgit/api/SubmoduleDeinitCommand.java
index 569a8e3..5a0528b 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/api/SubmoduleDeinitCommand.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/api/SubmoduleDeinitCommand.java
@@ -227,11 +227,11 @@
 				return SubmoduleDeinitStatus.DIRTY;
 			}
 
-			Repository submoduleRepo = w.getRepository();
-
-			Status status = Git.wrap(submoduleRepo).status().call();
-			return status.isClean() ? SubmoduleDeinitStatus.SUCCESS
-					: SubmoduleDeinitStatus.DIRTY;
+			try (Repository submoduleRepo = w.getRepository()) {
+				Status status = Git.wrap(submoduleRepo).status().call();
+				return status.isClean() ? SubmoduleDeinitStatus.SUCCESS
+						: SubmoduleDeinitStatus.DIRTY;
+			}
 		}
 	}
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/attributes/AttributesNode.java b/org.eclipse.jgit/src/org/eclipse/jgit/attributes/AttributesNode.java
index 62bf9f2..bcd7231 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/attributes/AttributesNode.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/attributes/AttributesNode.java
@@ -42,6 +42,8 @@
  */
 package org.eclipse.jgit.attributes;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
@@ -50,8 +52,6 @@
 import java.util.Collections;
 import java.util.List;
 
-import org.eclipse.jgit.lib.Constants;
-
 /**
  * Represents a bundle of attributes inherited from a base directory.
  *
@@ -115,7 +115,7 @@
 	}
 
 	private static BufferedReader asReader(InputStream in) {
-		return new BufferedReader(new InputStreamReader(in, Constants.CHARSET));
+		return new BufferedReader(new InputStreamReader(in, UTF_8));
 	}
 
 	/**
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/blame/BlameGenerator.java b/org.eclipse.jgit/src/org/eclipse/jgit/blame/BlameGenerator.java
index 1ad7a30..9cec645 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/blame/BlameGenerator.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/blame/BlameGenerator.java
@@ -539,7 +539,7 @@
 		n.beginResult(revPool);
 		outCandidate = n;
 		outRegion = n.regionList;
-		return true;
+		return outRegion != null;
 	}
 
 	private boolean reverseResult(Candidate parent, Candidate source)
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/diff/DiffConfig.java b/org.eclipse.jgit/src/org/eclipse/jgit/diff/DiffConfig.java
index 21dca6b..ca37a10 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/diff/DiffConfig.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/diff/DiffConfig.java
@@ -82,7 +82,7 @@
 		renameDetectionType = parseRenameDetectionType(rc.getString(
 				ConfigConstants.CONFIG_DIFF_SECTION, null, ConfigConstants.CONFIG_KEY_RENAMES));
 		renameLimit = rc.getInt(ConfigConstants.CONFIG_DIFF_SECTION,
-				ConfigConstants.CONFIG_KEY_RENAMELIMIT, 200);
+				ConfigConstants.CONFIG_KEY_RENAMELIMIT, 400);
 	}
 
 	/**
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/diff/DiffFormatter.java b/org.eclipse.jgit/src/org/eclipse/jgit/diff/DiffFormatter.java
index 7aaa500..e7ad0bc 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/diff/DiffFormatter.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/diff/DiffFormatter.java
@@ -67,6 +67,7 @@
 import org.eclipse.jgit.dircache.DirCacheIterator;
 import org.eclipse.jgit.errors.AmbiguousObjectException;
 import org.eclipse.jgit.errors.BinaryBlobException;
+import org.eclipse.jgit.errors.CancelledException;
 import org.eclipse.jgit.errors.CorruptObjectException;
 import org.eclipse.jgit.errors.IncorrectObjectTypeException;
 import org.eclipse.jgit.errors.MissingObjectException;
@@ -577,7 +578,14 @@
 			throws IOException {
 		renameDetector.reset();
 		renameDetector.addAll(files);
-		return renameDetector.compute(reader, progressMonitor);
+		try {
+			return renameDetector.compute(reader, progressMonitor);
+		} catch (CancelledException e) {
+			// TODO: consider propagating once bug 536323 is tackled
+			// (making DiffEntry.scan() and DiffFormatter.scan() and
+			// format() cancellable).
+			return Collections.emptyList();
+		}
 	}
 
 	private boolean isAdd(List<DiffEntry> files) {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/diff/RenameDetector.java b/org.eclipse.jgit/src/org/eclipse/jgit/diff/RenameDetector.java
index 7bb217d..772fbb5 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/diff/RenameDetector.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/diff/RenameDetector.java
@@ -57,6 +57,7 @@
 
 import org.eclipse.jgit.diff.DiffEntry.ChangeType;
 import org.eclipse.jgit.diff.SimilarityIndex.TableFullException;
+import org.eclipse.jgit.errors.CancelledException;
 import org.eclipse.jgit.internal.JGitText;
 import org.eclipse.jgit.lib.AbbreviatedObjectId;
 import org.eclipse.jgit.lib.FileMode;
@@ -332,8 +333,13 @@
 	 *         representing all files that have been changed.
 	 * @throws java.io.IOException
 	 *             file contents cannot be read from the repository.
+	 * @throws CancelledException
+	 *             if rename detection was cancelled
 	 */
-	public List<DiffEntry> compute(ProgressMonitor pm) throws IOException {
+	// TODO(ms): use org.eclipse.jgit.api.errors.CanceledException in next major
+	// version
+	public List<DiffEntry> compute(ProgressMonitor pm)
+			throws IOException, CancelledException {
 		if (!done) {
 			try {
 				return compute(objectReader, pm);
@@ -355,9 +361,13 @@
 	 *         representing all files that have been changed.
 	 * @throws java.io.IOException
 	 *             file contents cannot be read from the repository.
+	 * @throws CancelledException
+	 *             if rename detection was cancelled
 	 */
+	// TODO(ms): use org.eclipse.jgit.api.errors.CanceledException in next major
+	// version
 	public List<DiffEntry> compute(ObjectReader reader, ProgressMonitor pm)
-			throws IOException {
+			throws IOException, CancelledException {
 		final ContentSource cs = ContentSource.create(reader);
 		return compute(new ContentSource.Pair(cs, cs), pm);
 	}
@@ -373,9 +383,13 @@
 	 *         representing all files that have been changed.
 	 * @throws java.io.IOException
 	 *             file contents cannot be read from the repository.
+	 * @throws CancelledException
+	 *             if rename detection was cancelled
 	 */
+	// TODO(ms): use org.eclipse.jgit.api.errors.CanceledException in next major
+	// version
 	public List<DiffEntry> compute(ContentSource.Pair reader, ProgressMonitor pm)
-			throws IOException {
+			throws IOException, CancelledException {
 		if (!done) {
 			done = true;
 
@@ -415,8 +429,15 @@
 		done = false;
 	}
 
+	private void advanceOrCancel(ProgressMonitor pm) throws CancelledException {
+		if (pm.isCancelled()) {
+			throw new CancelledException(JGitText.get().renameCancelled);
+		}
+		pm.update(1);
+	}
+
 	private void breakModifies(ContentSource.Pair reader, ProgressMonitor pm)
-			throws IOException {
+			throws IOException, CancelledException {
 		ArrayList<DiffEntry> newEntries = new ArrayList<>(entries.size());
 
 		pm.beginTask(JGitText.get().renamesBreakingModifies, entries.size());
@@ -437,13 +458,13 @@
 			} else {
 				newEntries.add(e);
 			}
-			pm.update(1);
+			advanceOrCancel(pm);
 		}
 
 		entries = newEntries;
 	}
 
-	private void rejoinModifies(ProgressMonitor pm) {
+	private void rejoinModifies(ProgressMonitor pm) throws CancelledException {
 		HashMap<String, DiffEntry> nameMap = new HashMap<>();
 		ArrayList<DiffEntry> newAdded = new ArrayList<>(added.size());
 
@@ -452,7 +473,7 @@
 
 		for (DiffEntry src : deleted) {
 			nameMap.put(src.oldPath, src);
-			pm.update(1);
+			advanceOrCancel(pm);
 		}
 
 		for (DiffEntry dst : added) {
@@ -468,7 +489,7 @@
 			} else {
 				newAdded.add(dst);
 			}
-			pm.update(1);
+			advanceOrCancel(pm);
 		}
 
 		added = newAdded;
@@ -498,7 +519,7 @@
 
 	private void findContentRenames(ContentSource.Pair reader,
 			ProgressMonitor pm)
-			throws IOException {
+			throws IOException, CancelledException {
 		int cnt = Math.max(added.size(), deleted.size());
 		if (getRenameLimit() == 0 || cnt <= getRenameLimit()) {
 			SimilarityRenameDetector d;
@@ -516,7 +537,8 @@
 	}
 
 	@SuppressWarnings("unchecked")
-	private void findExactRenames(ProgressMonitor pm) {
+	private void findExactRenames(ProgressMonitor pm)
+			throws CancelledException {
 		pm.beginTask(JGitText.get().renamesFindingExact, //
 				added.size() + added.size() + deleted.size()
 						+ added.size() * deleted.size());
@@ -562,7 +584,7 @@
 			} else {
 				left.add(a);
 			}
-			pm.update(1);
+			advanceOrCancel(pm);
 		}
 
 		for (List<DiffEntry> adds : nonUniqueAdds) {
@@ -604,6 +626,10 @@
 						int score = SimilarityRenameDetector.nameScore(addedName, deletedName);
 						matrix[mNext] = SimilarityRenameDetector.encode(score, delIdx, addIdx);
 						mNext++;
+						if (pm.isCancelled()) {
+							throw new CancelledException(
+									JGitText.get().renameCancelled);
+						}
 					}
 				}
 
@@ -617,7 +643,7 @@
 					DiffEntry a = adds.get(addIdx);
 
 					if (a == null) {
-						pm.update(1);
+						advanceOrCancel(pm);
 						continue; // was already matched earlier
 					}
 
@@ -635,11 +661,12 @@
 
 					entries.add(DiffEntry.pair(type, d, a, 100));
 					adds.set(addIdx, null); // Claim the destination was matched.
-					pm.update(1);
+					advanceOrCancel(pm);
 				}
 			} else {
 				left.addAll(adds);
 			}
+			advanceOrCancel(pm);
 		}
 		added = left;
 
@@ -692,7 +719,8 @@
 
 	@SuppressWarnings("unchecked")
 	private HashMap<AbbreviatedObjectId, Object> populateMap(
-			List<DiffEntry> diffEntries, ProgressMonitor pm) {
+			List<DiffEntry> diffEntries, ProgressMonitor pm)
+			throws CancelledException {
 		HashMap<AbbreviatedObjectId, Object> map = new HashMap<>();
 		for (DiffEntry de : diffEntries) {
 			Object old = map.put(id(de), de);
@@ -706,7 +734,7 @@
 				((List<DiffEntry>) old).add(de);
 				map.put(id(de), old);
 			}
-			pm.update(1);
+			advanceOrCancel(pm);
 		}
 		return map;
 	}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/diff/SimilarityRenameDetector.java b/org.eclipse.jgit/src/org/eclipse/jgit/diff/SimilarityRenameDetector.java
index 653658b..d8a05c3 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/diff/SimilarityRenameDetector.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/diff/SimilarityRenameDetector.java
@@ -54,6 +54,7 @@
 
 import org.eclipse.jgit.diff.DiffEntry.ChangeType;
 import org.eclipse.jgit.diff.SimilarityIndex.TableFullException;
+import org.eclipse.jgit.errors.CancelledException;
 import org.eclipse.jgit.internal.JGitText;
 import org.eclipse.jgit.lib.FileMode;
 import org.eclipse.jgit.lib.NullProgressMonitor;
@@ -128,7 +129,7 @@
 		renameScore = score;
 	}
 
-	void compute(ProgressMonitor pm) throws IOException {
+	void compute(ProgressMonitor pm) throws IOException, CancelledException {
 		if (pm == null)
 			pm = NullProgressMonitor.INSTANCE;
 
@@ -142,6 +143,11 @@
 		// we have looked at everything that is above our minimum score.
 		//
 		for (--mNext; mNext >= 0; mNext--) {
+			if (pm.isCancelled()) {
+				// TODO(ms): use org.eclipse.jgit.api.errors.CanceledException
+				// in next major version
+				throw new CancelledException(JGitText.get().renameCancelled);
+			}
 			long ent = matrix[mNext];
 			int sIdx = srcFile(ent);
 			int dIdx = dstFile(ent);
@@ -209,7 +215,8 @@
 		return r;
 	}
 
-	private int buildMatrix(ProgressMonitor pm) throws IOException {
+	private int buildMatrix(ProgressMonitor pm)
+			throws IOException, CancelledException {
 		// Allocate for the worst-case scenario where every pair has a
 		// score that we need to consider. We might not need that many.
 		//
@@ -234,6 +241,14 @@
 			SimilarityIndex s = null;
 
 			for (int dstIdx = 0; dstIdx < dsts.size(); dstIdx++) {
+				if (pm.isCancelled()) {
+					// TODO(ms): use
+					// org.eclipse.jgit.api.errors.CanceledException in next
+					// major version
+					throw new CancelledException(
+							JGitText.get().renameCancelled);
+				}
+
 				DiffEntry dstEnt = dsts.get(dstIdx);
 
 				if (!isFile(dstEnt.newMode)) {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheCheckout.java b/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheCheckout.java
index 0b03eb1..ca1e3ab 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheCheckout.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheCheckout.java
@@ -513,7 +513,7 @@
 
 			if (!conflicts.isEmpty()) {
 				if (failOnConflict)
-					throw new CheckoutConflictException(conflicts.toArray(new String[conflicts.size()]));
+					throw new CheckoutConflictException(conflicts.toArray(new String[0]));
 				else
 					cleanUpConflicts();
 			}
@@ -1366,7 +1366,11 @@
 	 *            object reader to use for checkout
 	 * @throws java.io.IOException
 	 * @since 3.6
+	 * @deprecated since 5.1, use
+	 *             {@link #checkoutEntry(Repository, DirCacheEntry, ObjectReader, boolean, CheckoutMetadata)}
+	 *             instead
 	 */
+	@Deprecated
 	public static void checkoutEntry(Repository repo, DirCacheEntry entry,
 			ObjectReader or) throws IOException {
 		checkoutEntry(repo, entry, or, false, null);
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheEntry.java b/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheEntry.java
index fee9f51..6b1d4f4 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheEntry.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheEntry.java
@@ -46,6 +46,8 @@
 
 package org.eclipse.jgit.dircache;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.ByteArrayOutputStream;
 import java.io.EOFException;
 import java.io.IOException;
@@ -772,7 +774,7 @@
 	}
 
 	static String toString(byte[] path) {
-		return Constants.CHARSET.decode(ByteBuffer.wrap(path)).toString();
+		return UTF_8.decode(ByteBuffer.wrap(path)).toString();
 	}
 
 	static int getMaximumInfoLength(boolean extended) {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheTree.java b/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheTree.java
index b605f3c..11a3474 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheTree.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheTree.java
@@ -44,6 +44,7 @@
 
 package org.eclipse.jgit.dircache;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.lib.FileMode.TREE;
 import static org.eclipse.jgit.lib.TreeFormatter.entrySize;
 
@@ -276,7 +277,7 @@
 	 */
 	public String getNameString() {
 		final ByteBuffer bb = ByteBuffer.wrap(encodedName);
-		return Constants.CHARSET.decode(bb).toString();
+		return UTF_8.decode(bb).toString();
 	}
 
 	/**
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/ManifestParser.java b/org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/ManifestParser.java
index 929ffac..26e783d 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/ManifestParser.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/ManifestParser.java
@@ -252,6 +252,9 @@
 							RepoText.get().errorIncludeFile, path), e);
 				}
 			}
+		} else if ("remove-project".equals(qName)) { //$NON-NLS-1$
+			String name = attributes.getValue("name"); //$NON-NLS-1$
+			projects.removeIf((p) -> p.getName().equals(name));
 		}
 	}
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/RepoCommand.java b/org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/RepoCommand.java
index 80fd3cf..45a239d 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/RepoCommand.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/RepoCommand.java
@@ -55,8 +55,8 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import java.util.Set;
 import java.util.StringJoiner;
+import java.util.TreeMap;
 
 import org.eclipse.jgit.annotations.Nullable;
 import org.eclipse.jgit.api.Git;
@@ -115,16 +115,15 @@
 	private String groupsParam;
 	private String branch;
 	private String targetBranch = Constants.HEAD;
-	private boolean recordRemoteBranch = false;
-	private boolean recordSubmoduleLabels = false;
-	private boolean recordShallowSubmodules = false;
+	private boolean recordRemoteBranch = true;
+	private boolean recordSubmoduleLabels = true;
+	private boolean recordShallowSubmodules = true;
 	private PersonIdent author;
 	private RemoteReader callback;
 	private InputStream inputStream;
 	private IncludedFileReader includedReader;
 	private boolean ignoreRemoteFailures = false;
 
-	private List<RepoProject> bareProjects;
 	private ProgressMonitor monitor;
 
 	/**
@@ -519,37 +518,33 @@
 		}
 
 		if (repo.isBare()) {
-			bareProjects = new ArrayList<>();
 			if (author == null)
 				author = new PersonIdent(repo);
 			if (callback == null)
 				callback = new DefaultRemoteReader();
-			for (RepoProject proj : filteredProjects) {
-				addSubmoduleBare(proj.getUrl(), proj.getPath(),
-						proj.getRevision(), proj.getCopyFiles(),
-						proj.getLinkFiles(), proj.getGroups(),
-						proj.getRecommendShallow());
-			}
+			List<RepoProject> renamedProjects = renameProjects(filteredProjects);
+
 			DirCache index = DirCache.newInCore();
 			DirCacheBuilder builder = index.builder();
 			ObjectInserter inserter = repo.newObjectInserter();
 			try (RevWalk rw = new RevWalk(repo)) {
 				Config cfg = new Config();
 				StringBuilder attributes = new StringBuilder();
-				for (RepoProject proj : bareProjects) {
+				for (RepoProject proj : renamedProjects) {
+					String name = proj.getName();
 					String path = proj.getPath();
-					String nameUri = proj.getName();
+					String url = proj.getUrl();
 					ObjectId objectId;
 					if (ObjectId.isId(proj.getRevision())) {
 						objectId = ObjectId.fromString(proj.getRevision());
 					} else {
-						objectId = callback.sha1(nameUri, proj.getRevision());
+						objectId = callback.sha1(url, proj.getRevision());
 						if (objectId == null && !ignoreRemoteFailures) {
-							throw new RemoteUnavailableException(nameUri);
+							throw new RemoteUnavailableException(url);
 						}
 						if (recordRemoteBranch) {
 							// can be branch or tag
-							cfg.setString("submodule", path, "branch", //$NON-NLS-1$ //$NON-NLS-2$
+							cfg.setString("submodule", name, "branch", //$NON-NLS-1$ //$NON-NLS-2$
 									proj.getRevision());
 						}
 
@@ -559,7 +554,7 @@
 							// depth in the 'clone-depth' field, while
 							// git core only uses a binary 'shallow = true/false'
 							// hint, we'll map any depth to 'shallow = true'
-							cfg.setBoolean("submodule", path, "shallow", //$NON-NLS-1$ //$NON-NLS-2$
+							cfg.setBoolean("submodule", name, "shallow", //$NON-NLS-1$ //$NON-NLS-2$
 									true);
 						}
 					}
@@ -575,12 +570,13 @@
 						attributes.append(rec.toString());
 					}
 
-					URI submodUrl = URI.create(nameUri);
+					URI submodUrl = URI.create(url);
 					if (targetUri != null) {
 						submodUrl = relativize(targetUri, submodUrl);
 					}
-					cfg.setString("submodule", path, "path", path); //$NON-NLS-1$ //$NON-NLS-2$
-					cfg.setString("submodule", path, "url", submodUrl.toString()); //$NON-NLS-1$ //$NON-NLS-2$
+					cfg.setString("submodule", name, "path", path); //$NON-NLS-1$ //$NON-NLS-2$
+					cfg.setString("submodule", name, "url", //$NON-NLS-1$ //$NON-NLS-2$
+							submodUrl.toString());
 
 					// create gitlink
 					if (objectId != null) {
@@ -591,7 +587,7 @@
 
 						for (CopyFile copyfile : proj.getCopyFiles()) {
 							byte[] src = callback.readFile(
-								nameUri, proj.getRevision(), copyfile.src);
+								url, proj.getRevision(), copyfile.src);
 							objectId = inserter.insert(Constants.OBJ_BLOB, src);
 							dcEntry = new DirCacheEntry(copyfile.dest);
 							dcEntry.setObjectId(objectId);
@@ -691,7 +687,7 @@
 		} else {
 			try (Git git = new Git(repo)) {
 				for (RepoProject proj : filteredProjects) {
-					addSubmodule(proj.getUrl(), proj.getPath(),
+					addSubmodule(proj.getName(), proj.getUrl(), proj.getPath(),
 							proj.getRevision(), proj.getCopyFiles(),
 							proj.getLinkFiles(), git);
 				}
@@ -703,9 +699,9 @@
 		}
 	}
 
-	private void addSubmodule(String url, String path, String revision,
-			List<CopyFile> copyfiles, List<LinkFile> linkfiles, Git git)
-			throws GitAPIException, IOException {
+	private void addSubmodule(String name, String url, String path,
+			String revision, List<CopyFile> copyfiles, List<LinkFile> linkfiles,
+			Git git) throws GitAPIException, IOException {
 		assert (!repo.isBare());
 		assert (git != null);
 		if (!linkfiles.isEmpty()) {
@@ -713,7 +709,8 @@
 					JGitText.get().nonBareLinkFilesNotSupported);
 		}
 
-		SubmoduleAddCommand add = git.submoduleAdd().setPath(path).setURI(url);
+		SubmoduleAddCommand add = git.submoduleAdd().setName(name).setPath(path)
+				.setURI(url);
 		if (monitor != null)
 			add.setProgressMonitor(monitor);
 
@@ -731,16 +728,42 @@
 		}
 	}
 
-	private void addSubmoduleBare(String url, String path, String revision,
-			List<CopyFile> copyfiles, List<LinkFile> linkfiles,
-			Set<String> groups, String recommendShallow) {
-		assert (repo.isBare());
-		assert (bareProjects != null);
-		RepoProject proj = new RepoProject(url, path, revision, null, groups,
-				recommendShallow);
-		proj.addCopyFiles(copyfiles);
-		proj.addLinkFiles(linkfiles);
-		bareProjects.add(proj);
+	/**
+	 * Rename the projects if there's a conflict when converted to submodules.
+	 *
+	 * @param projects
+	 *            parsed projects
+	 * @return projects that are renamed if necessary
+	 */
+	private List<RepoProject> renameProjects(List<RepoProject> projects) {
+		Map<String, List<RepoProject>> m = new TreeMap<>();
+		for (RepoProject proj : projects) {
+			List<RepoProject> l = m.get(proj.getName());
+			if (l == null) {
+				l = new ArrayList<>();
+				m.put(proj.getName(), l);
+			}
+			l.add(proj);
+		}
+
+		List<RepoProject> ret = new ArrayList<>();
+		for (List<RepoProject> ps : m.values()) {
+			boolean nameConflict = ps.size() != 1;
+			for (RepoProject proj : ps) {
+				String name = proj.getName();
+				if (nameConflict) {
+					name += SLASH + proj.getPath();
+				}
+				RepoProject p = new RepoProject(name,
+						proj.getPath(), proj.getRevision(), null,
+						proj.getGroups(), proj.getRecommendShallow());
+				p.setUrl(proj.getUrl());
+				p.addCopyFiles(proj.getCopyFiles());
+				p.addLinkFiles(proj.getLinkFiles());
+				ret.add(p);
+			}
+		}
+		return ret;
 	}
 
 	/*
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/hooks/GitHook.java b/org.eclipse.jgit/src/org/eclipse/jgit/hooks/GitHook.java
index 8a61d1b..ad43e2c 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/hooks/GitHook.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/hooks/GitHook.java
@@ -42,7 +42,7 @@
  */
 package org.eclipse.jgit.hooks;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
@@ -158,7 +158,7 @@
 		PrintStream hookErrRedirect = null;
 		try {
 			hookErrRedirect = new PrintStream(errorByteArray, false,
-					CHARSET.name());
+					UTF_8.name());
 		} catch (UnsupportedEncodingException e) {
 			// UTF-8 is guaranteed to be available
 		}
@@ -167,7 +167,7 @@
 				hookErrRedirect, getStdinArgs());
 		if (result.isExecutedWithError()) {
 			throw new AbortedByHookException(
-					new String(errorByteArray.toByteArray(), CHARSET),
+					new String(errorByteArray.toByteArray(), UTF_8),
 					getHookName(), result.getExitCode());
 		}
 	}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/ignore/IgnoreNode.java b/org.eclipse.jgit/src/org/eclipse/jgit/ignore/IgnoreNode.java
index d570fde..864f8bf 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/ignore/IgnoreNode.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/ignore/IgnoreNode.java
@@ -42,6 +42,8 @@
  */
 package org.eclipse.jgit.ignore;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
@@ -50,8 +52,6 @@
 import java.util.Collections;
 import java.util.List;
 
-import org.eclipse.jgit.lib.Constants;
-
 /**
  * Represents a bundle of ignore rules inherited from a base directory.
  *
@@ -121,7 +121,7 @@
 	}
 
 	private static BufferedReader asReader(InputStream in) {
-		return new BufferedReader(new InputStreamReader(in, Constants.CHARSET));
+		return new BufferedReader(new InputStreamReader(in, UTF_8));
 	}
 
 	/**
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java
index 18f4c85..c11ae5a 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java
@@ -643,6 +643,7 @@
 	/***/ public String renameBranchFailedBecauseTag;
 	/***/ public String renameBranchFailedUnknownReason;
 	/***/ public String renameBranchUnexpectedResult;
+	/***/ public String renameCancelled;
 	/***/ public String renameFileFailed;
 	/***/ public String renamesAlreadyFound;
 	/***/ public String renamesBreakingModifies;
@@ -826,8 +827,8 @@
 	/***/ public String upstreamBranchName;
 	/***/ public String uriNotConfigured;
 	/***/ public String uriNotFound;
+	/***/ public String uriNotFoundWithMessage;
 	/***/ public String URINotSupported;
-	/***/ public String URLNotFound;
 	/***/ public String userConfigFileInvalid;
 	/***/ public String walkFailure;
 	/***/ public String wantNotValid;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/ketch/KetchLeader.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/ketch/KetchLeader.java
index bc5ba39..fa32b26 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/ketch/KetchLeader.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/ketch/KetchLeader.java
@@ -274,8 +274,8 @@
 
 		lock.lock();
 		try {
-			voters = v.toArray(new KetchReplica[v.size()]);
-			followers = f.toArray(new KetchReplica[f.size()]);
+			voters = v.toArray(new KetchReplica[0]);
+			followers = f.toArray(new KetchReplica[0]);
 			self = me;
 		} finally {
 			lock.unlock();
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/ketch/LocalReplica.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/ketch/LocalReplica.java
index 7ddde63..6f1f5c5 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/ketch/LocalReplica.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/ketch/LocalReplica.java
@@ -209,7 +209,7 @@
 		checkFailed(failed, accepted);
 		checkFailed(failed, committed);
 		if (!failed.isEmpty()) {
-			String[] arr = failed.toArray(new String[failed.size()]);
+			String[] arr = failed.toArray(new String[0]);
 			req.setRefs(refdb.exactRef(arr));
 		}
 	}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsConfig.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsConfig.java
index 3e2963a..2f796a9 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsConfig.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsConfig.java
@@ -48,7 +48,13 @@
 import org.eclipse.jgit.errors.ConfigInvalidException;
 import org.eclipse.jgit.lib.StoredConfig;
 
-final class DfsConfig extends StoredConfig {
+/**
+ * Config implementation used by DFS repositories.
+ * <p>
+ * The current implementation acts as if there is no persistent storage: loading
+ * simply clears the config, and saving does nothing.
+ */
+public final class DfsConfig extends StoredConfig {
 	/** {@inheritDoc} */
 	@Override
 	public void load() throws IOException, ConfigInvalidException {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsFsck.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsFsck.java
index 985393c..3f96d09 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsFsck.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsFsck.java
@@ -146,7 +146,7 @@
 			throws IOException {
 		pm.beginTask(JGitText.get().countingObjects, ProgressMonitor.UNKNOWN);
 		try (ObjectWalk ow = new ObjectWalk(repo)) {
-			for (Ref r : repo.getAllRefs().values()) {
+			for (Ref r : repo.getRefDatabase().getRefs()) {
 				ObjectId objectId = r.getObjectId();
 				if (objectId == null) {
 					// skip unborn branch
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsObjDatabase.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsObjDatabase.java
index ca54ee2..09d5937 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsObjDatabase.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsObjDatabase.java
@@ -43,13 +43,17 @@
 
 package org.eclipse.jgit.internal.storage.dfs;
 
+import static java.util.stream.Collectors.joining;
+
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
@@ -86,10 +90,16 @@
 		}
 	};
 
-	/** Sources for a pack file. */
+	/**
+	 * Sources for a pack file.
+	 * <p>
+	 * <strong>Note:</strong> When sorting packs by source, do not use the default
+	 * comparator based on {@link Enum#compareTo}. Prefer {@link
+	 * #DEFAULT_COMPARATOR} or your own {@link ComparatorBuilder}.
+	 */
 	public static enum PackSource {
 		/** The pack is created by ObjectInserter due to local activity. */
-		INSERT(0),
+		INSERT,
 
 		/**
 		 * The pack is created by PackParser due to a network event.
@@ -100,7 +110,7 @@
 		 * storage layout preferred by this version. Received packs are likely
 		 * to be either compacted or garbage collected in the future.
 		 */
-		RECEIVE(0),
+		RECEIVE,
 
 		/**
 		 * The pack was created by compacting multiple packs together.
@@ -111,7 +121,7 @@
 		 *
 		 * @see DfsPackCompactor
 		 */
-		COMPACT(1),
+		COMPACT,
 
 		/**
 		 * Pack was created by Git garbage collection by this implementation.
@@ -122,17 +132,17 @@
 		 *
 		 * @see DfsGarbageCollector
 		 */
-		GC(2),
+		GC,
 
 		/** Created from non-heads by {@link DfsGarbageCollector}. */
-		GC_REST(3),
+		GC_REST,
 
 		/**
 		 * RefTreeGraph pack was created by Git garbage collection.
 		 *
 		 * @see DfsGarbageCollector
 		 */
-		GC_TXN(4),
+		GC_TXN,
 
 		/**
 		 * Pack was created by Git garbage collection.
@@ -141,12 +151,86 @@
 		 * last GC pass. It is retained in a new pack until it is safe to prune
 		 * these objects from the repository.
 		 */
-		UNREACHABLE_GARBAGE(5);
+		UNREACHABLE_GARBAGE;
 
-		final int category;
+		/**
+		 * Default comparator for sources.
+		 * <p>
+		 * Sorts generally newer, smaller types such as {@code INSERT} and {@code
+		 * RECEIVE} earlier; older, larger types such as {@code GC} later; and
+		 * {@code UNREACHABLE_GARBAGE} at the end.
+		 */
+		public static final Comparator<PackSource> DEFAULT_COMPARATOR =
+				new ComparatorBuilder()
+						.add(INSERT, RECEIVE)
+						.add(COMPACT)
+						.add(GC)
+						.add(GC_REST)
+						.add(GC_TXN)
+						.add(UNREACHABLE_GARBAGE)
+						.build();
 
-		PackSource(int category) {
-			this.category = category;
+		/**
+		 * Builder for describing {@link PackSource} ordering where some values are
+		 * explicitly considered equal to others.
+		 */
+		public static class ComparatorBuilder {
+			private final Map<PackSource, Integer> ranks = new HashMap<>();
+			private int counter;
+
+			/**
+			 * Add a collection of sources that should sort as equal.
+			 * <p>
+			 * Sources in the input will sort after sources listed in previous calls
+			 * to this method.
+			 *
+			 * @param sources
+			 *            sources in this equivalence class.
+			 * @return this.
+			 */
+			public ComparatorBuilder add(PackSource... sources) {
+				for (PackSource s : sources) {
+					ranks.put(s, Integer.valueOf(counter));
+				}
+				counter++;
+				return this;
+			}
+
+			/**
+			 * Build the comparator.
+			 *
+			 * @return new comparator instance.
+			 * @throws IllegalArgumentException
+			 *             not all {@link PackSource} instances were explicitly assigned
+			 *             an equivalence class.
+			 */
+			public Comparator<PackSource> build() {
+				return new PackSourceComparator(ranks);
+			}
+		}
+
+		private static class PackSourceComparator implements Comparator<PackSource> {
+			private final Map<PackSource, Integer> ranks;
+
+			private PackSourceComparator(Map<PackSource, Integer> ranks) {
+				if (!ranks.keySet().equals(
+							new HashSet<>(Arrays.asList(PackSource.values())))) {
+					throw new IllegalArgumentException();
+				}
+				this.ranks = new HashMap<>(ranks);
+			}
+
+			@Override
+			public int compare(PackSource a, PackSource b) {
+				return ranks.get(a).compareTo(ranks.get(b));
+			}
+
+			@Override
+			public String toString() {
+				return Arrays.stream(PackSource.values())
+						.map(s -> s + "=" + ranks.get(s)) //$NON-NLS-1$
+						.collect(joining(", ", getClass().getSimpleName() + "{", "}")); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
+			}
 		}
 	}
 
@@ -156,6 +240,8 @@
 
 	private DfsReaderOptions readerOptions;
 
+	private Comparator<DfsPackDescription> packComparator;
+
 	/**
 	 * Initialize an object database for our repository.
 	 *
@@ -169,6 +255,7 @@
 		this.repository = repository;
 		this.packList = new AtomicReference<>(NO_PACKS);
 		this.readerOptions = options;
+		this.packComparator = DfsPackDescription.objectLookupComparator();
 	}
 
 	/**
@@ -180,6 +267,21 @@
 		return readerOptions;
 	}
 
+	/**
+	 * Set the comparator used when searching for objects across packs.
+	 * <p>
+	 * An optimal comparator will find more objects without having to load large
+	 * idx files from storage only to find that they don't contain the object.
+	 * See {@link DfsPackDescription#objectLookupComparator()} for the default
+	 * heuristics.
+	 *
+	 * @param packComparator
+	 *            comparator.
+	 */
+	public void setPackComparator(Comparator<DfsPackDescription> packComparator) {
+		this.packComparator = packComparator;
+	}
+
 	/** {@inheritDoc} */
 	@Override
 	public DfsReader newReader() {
@@ -523,7 +625,7 @@
 		Map<DfsPackDescription, DfsReftable> reftables = reftableMap(old);
 
 		List<DfsPackDescription> scanned = listPacks();
-		Collections.sort(scanned);
+		Collections.sort(scanned, packComparator);
 
 		List<DfsPackFile> newPacks = new ArrayList<>(scanned.size());
 		List<DfsReftable> newReftables = new ArrayList<>(scanned.size());
@@ -584,30 +686,9 @@
 	 * @return comparator to sort {@link DfsReftable} by priority.
 	 */
 	protected Comparator<DfsReftable> reftableComparator() {
-		return (fa, fb) -> {
-			DfsPackDescription a = fa.getPackDescription();
-			DfsPackDescription b = fb.getPackDescription();
-
-			// GC, COMPACT reftables first by higher category.
-			int c = category(b) - category(a);
-			if (c != 0) {
-				return c;
-			}
-
-			// Lower maxUpdateIndex first.
-			c = Long.signum(a.getMaxUpdateIndex() - b.getMaxUpdateIndex());
-			if (c != 0) {
-				return c;
-			}
-
-			// Older reftable first.
-			return Long.signum(a.getLastModified() - b.getLastModified());
-		};
-	}
-
-	static int category(DfsPackDescription d) {
-		PackSource s = d.getPackSource();
-		return s != null ? s.category : 0;
+		return Comparator.comparing(
+				DfsReftable::getPackDescription,
+				DfsPackDescription.reftableComparator());
 	}
 
 	/**
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackCompactor.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackCompactor.java
index b43b9b1..127ee6b 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackCompactor.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackCompactor.java
@@ -404,12 +404,11 @@
 		// Sort packs by description ordering, this places newer packs before
 		// older packs, allowing the PackWriter to be handed newer objects
 		// first and older objects last.
-		Collections.sort(srcPacks, new Comparator<DfsPackFile>() {
-			@Override
-			public int compare(DfsPackFile a, DfsPackFile b) {
-				return a.getPackDescription().compareTo(b.getPackDescription());
-			}
-		});
+		Collections.sort(
+				srcPacks,
+				Comparator.comparing(
+						DfsPackFile::getPackDescription,
+						DfsPackDescription.objectLookupComparator()));
 
 		rw = new RevWalk(ctx);
 		added = rw.newFlag("ADDED"); //$NON-NLS-1$
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackDescription.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackDescription.java
index 45eb7b0..5a1ac02 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackDescription.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackDescription.java
@@ -47,7 +47,9 @@
 import static org.eclipse.jgit.internal.storage.pack.PackExt.REFTABLE;
 
 import java.util.Arrays;
+import java.util.Comparator;
 
+import org.eclipse.jgit.annotations.NonNull;
 import org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource;
 import org.eclipse.jgit.internal.storage.pack.PackExt;
 import org.eclipse.jgit.internal.storage.reftable.ReftableWriter;
@@ -61,7 +63,107 @@
  * Instances of this class are cached with the DfsPackFile, and should not be
  * modified once initialized and presented to the JGit DFS library.
  */
-public class DfsPackDescription implements Comparable<DfsPackDescription> {
+public class DfsPackDescription {
+	/**
+	 * Comparator for packs when looking up objects in indexes.
+	 * <p>
+	 * This comparator tries to position packs in the order readers should examine
+	 * them when looking for objects by SHA-1. The default tries to sort packs
+	 * with more recent modification dates before older packs, and packs with
+	 * fewer objects before packs with more objects.
+	 * <p>
+	 * Uses {@link PackSource#DEFAULT_COMPARATOR} for the portion of comparison
+	 * where packs are sorted by source.
+	 *
+	 * @return comparator.
+	 */
+	public static Comparator<DfsPackDescription> objectLookupComparator() {
+		return objectLookupComparator(PackSource.DEFAULT_COMPARATOR);
+	}
+
+	/**
+	 * Comparator for packs when looking up objects in indexes.
+	 * <p>
+	 * This comparator tries to position packs in the order readers should examine
+	 * them when looking for objects by SHA-1. The default tries to sort packs
+	 * with more recent modification dates before older packs, and packs with
+	 * fewer objects before packs with more objects.
+	 *
+	 * @param packSourceComparator
+	 *            comparator for the {@link PackSource}, used as the first step in
+	 *            comparison.
+	 * @return comparator.
+	 */
+	public static Comparator<DfsPackDescription> objectLookupComparator(
+			Comparator<PackSource> packSourceComparator) {
+		return Comparator.comparing(
+					DfsPackDescription::getPackSource, packSourceComparator)
+			.thenComparing((a, b) -> {
+				PackSource as = a.getPackSource();
+				PackSource bs = b.getPackSource();
+
+				// Tie break GC type packs by smallest first. There should be at most
+				// one of each source, but when multiple exist concurrent GCs may have
+				// run. Preferring the smaller file selects higher quality delta
+				// compression, placing less demand on the DfsBlockCache.
+				if (as == bs && isGC(as)) {
+					int cmp = Long.signum(a.getFileSize(PACK) - b.getFileSize(PACK));
+					if (cmp != 0) {
+						return cmp;
+					}
+				}
+
+				// Newer packs should sort first.
+				int cmp = Long.signum(b.getLastModified() - a.getLastModified());
+				if (cmp != 0) {
+					return cmp;
+				}
+
+				// Break ties on smaller index. Readers may get lucky and find
+				// the object they care about in the smaller index. This also pushes
+				// big historical packs to the end of the list, due to more objects.
+				return Long.signum(a.getObjectCount() - b.getObjectCount());
+			});
+	}
+
+	static Comparator<DfsPackDescription> reftableComparator() {
+		return (a, b) -> {
+				// GC, COMPACT reftables first by reversing default order.
+				int c = PackSource.DEFAULT_COMPARATOR.reversed()
+						.compare(a.getPackSource(), b.getPackSource());
+				if (c != 0) {
+					return c;
+				}
+
+				// Lower maxUpdateIndex first.
+				c = Long.signum(a.getMaxUpdateIndex() - b.getMaxUpdateIndex());
+				if (c != 0) {
+					return c;
+				}
+
+				// Older reftable first.
+				return Long.signum(a.getLastModified() - b.getLastModified());
+			};
+	}
+
+	static Comparator<DfsPackDescription> reuseComparator() {
+		return (a, b) -> {
+			PackSource as = a.getPackSource();
+			PackSource bs = b.getPackSource();
+
+			if (as == bs && DfsPackDescription.isGC(as)) {
+				// Push smaller GC files last; these likely have higher quality
+				// delta compression and the contained representation should be
+				// favored over other files.
+				return Long.signum(b.getFileSize(PACK) - a.getFileSize(PACK));
+			}
+
+			// DfsPackDescription.compareTo already did a reasonable sort.
+			// Rely on Arrays.sort being stable, leaving equal elements.
+			return 0;
+		};
+	}
+
 	private final DfsRepositoryDescription repoDesc;
 	private final String packName;
 	private PackSource packSource;
@@ -93,11 +195,15 @@
 	 *            name of the pack file. Must end with ".pack".
 	 * @param repoDesc
 	 *            description of the repo containing the pack file.
+	 * @param packSource
+	 *            the source of the pack.
 	 */
-	public DfsPackDescription(DfsRepositoryDescription repoDesc, String name) {
+	public DfsPackDescription(DfsRepositoryDescription repoDesc, String name,
+			@NonNull PackSource packSource) {
 		this.repoDesc = repoDesc;
 		int dot = name.lastIndexOf('.');
 		this.packName = (dot < 0) ? name : name.substring(0, dot);
+		this.packSource = packSource;
 
 		int extCnt = PackExt.values().length;
 		sizeMap = new long[extCnt];
@@ -162,6 +268,7 @@
 	 *
 	 * @return the source of the pack.
 	 */
+	@NonNull
 	public PackSource getPackSource() {
 		return packSource;
 	}
@@ -173,7 +280,7 @@
 	 *            the source of the pack.
 	 * @return {@code this}
 	 */
-	public DfsPackDescription setPackSource(PackSource source) {
+	public DfsPackDescription setPackSource(@NonNull PackSource source) {
 		packSource = source;
 		return this;
 	}
@@ -455,49 +562,6 @@
 		return false;
 	}
 
-	/**
-	 * {@inheritDoc}
-	 * <p>
-	 * Sort packs according to the optimal lookup ordering.
-	 * <p>
-	 * This method tries to position packs in the order readers should examine
-	 * them when looking for objects by SHA-1. The default tries to sort packs
-	 * with more recent modification dates before older packs, and packs with
-	 * fewer objects before packs with more objects.
-	 */
-	@Override
-	public int compareTo(DfsPackDescription b) {
-		// Cluster by PackSource, pushing UNREACHABLE_GARBAGE to the end.
-		PackSource as = getPackSource();
-		PackSource bs = b.getPackSource();
-		if (as != null && bs != null) {
-			int cmp = as.category - bs.category;
-			if (cmp != 0)
-				return cmp;
-		}
-
-		// Tie break GC type packs by smallest first. There should be at most
-		// one of each source, but when multiple exist concurrent GCs may have
-		// run. Preferring the smaller file selects higher quality delta
-		// compression, placing less demand on the DfsBlockCache.
-		if (as != null && as == bs && isGC(as)) {
-			int cmp = Long.signum(getFileSize(PACK) - b.getFileSize(PACK));
-			if (cmp != 0) {
-				return cmp;
-			}
-		}
-
-		// Newer packs should sort first.
-		int cmp = Long.signum(b.getLastModified() - getLastModified());
-		if (cmp != 0)
-			return cmp;
-
-		// Break ties on smaller index. Readers may get lucky and find
-		// the object they care about in the smaller index. This also pushes
-		// big historical packs to the end of the list, due to more objects.
-		return Long.signum(getObjectCount() - b.getObjectCount());
-	}
-
 	static boolean isGC(PackSource s) {
 		switch (s) {
 		case GC:
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsReader.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsReader.java
index 197114b..d04709f 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsReader.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsReader.java
@@ -45,7 +45,6 @@
 package org.eclipse.jgit.internal.storage.dfs;
 
 import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.UNREACHABLE_GARBAGE;
-import static org.eclipse.jgit.internal.storage.pack.PackExt.PACK;
 import static org.eclipse.jgit.lib.Constants.OBJECT_ID_LENGTH;
 
 import java.io.IOException;
@@ -66,7 +65,6 @@
 import org.eclipse.jgit.errors.StoredObjectRepresentationNotAvailableException;
 import org.eclipse.jgit.internal.JGitText;
 import org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackList;
-import org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource;
 import org.eclipse.jgit.internal.storage.file.BitmapIndexImpl;
 import org.eclipse.jgit.internal.storage.file.PackBitmapIndex;
 import org.eclipse.jgit.internal.storage.file.PackIndex;
@@ -611,26 +609,9 @@
 		}
 	}
 
-	private static final Comparator<DfsPackFile> PACK_SORT_FOR_REUSE = new Comparator<DfsPackFile>() {
-		@Override
-		public int compare(DfsPackFile af, DfsPackFile bf) {
-			DfsPackDescription ad = af.getPackDescription();
-			DfsPackDescription bd = bf.getPackDescription();
-			PackSource as = ad.getPackSource();
-			PackSource bs = bd.getPackSource();
-
-			if (as != null && as == bs && DfsPackDescription.isGC(as)) {
-				// Push smaller GC files last; these likely have higher quality
-				// delta compression and the contained representation should be
-				// favored over other files.
-				return Long.signum(bd.getFileSize(PACK) - ad.getFileSize(PACK));
-			}
-
-			// DfsPackDescription.compareTo already did a reasonable sort.
-			// Rely on Arrays.sort being stable, leaving equal elements.
-			return 0;
-		}
-	};
+	private static final Comparator<DfsPackFile> PACK_SORT_FOR_REUSE =
+		Comparator.comparing(
+				DfsPackFile::getPackDescription, DfsPackDescription.reuseComparator());
 
 	private List<DfsPackFile> sortPacksForSelectRepresentation()
 			throws IOException {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsReftableDatabase.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsReftableDatabase.java
index 40cfb71..7081630 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsReftableDatabase.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsReftableDatabase.java
@@ -45,6 +45,9 @@
 
 import java.io.IOException;
 import java.util.Arrays;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
 import java.util.Map;
 import java.util.concurrent.locks.ReentrantLock;
 
@@ -196,7 +199,7 @@
 			}
 
 			// Cannot be the container of an existing reference.
-			return table.hasRef(refName + '/');
+			return table.hasRefsWithPrefix(refName + '/');
 		} finally {
 			lock.unlock();
 		}
@@ -238,7 +241,8 @@
 		try {
 			Reftable table = reader();
 			try (RefCursor rc = ALL.equals(prefix) ? table.allRefs()
-					: table.seekRef(prefix)) {
+					: (prefix.endsWith("/") ? table.seekRefsWithPrefix(prefix) //$NON-NLS-1$
+							: table.seekRef(prefix))) {
 				while (rc.next()) {
 					Ref ref = table.resolve(rc.getRef());
 					if (ref != null && ref.getObjectId() != null) {
@@ -256,6 +260,29 @@
 
 	/** {@inheritDoc} */
 	@Override
+	public List<Ref> getRefsByPrefix(String prefix) throws IOException {
+		List<Ref> all = new ArrayList<>();
+		lock.lock();
+		try {
+			Reftable table = reader();
+			try (RefCursor rc = ALL.equals(prefix) ? table.allRefs()
+					: table.seekRefsWithPrefix(prefix)) {
+				while (rc.next()) {
+					Ref ref = table.resolve(rc.getRef());
+					if (ref != null && ref.getObjectId() != null) {
+						all.add(ref);
+					}
+				}
+			}
+		} finally {
+			lock.unlock();
+		}
+
+		return Collections.unmodifiableList(all);
+	}
+
+	/** {@inheritDoc} */
+	@Override
 	public Ref peel(Ref ref) throws IOException {
 		Ref oldLeaf = ref.getLeaf();
 		if (oldLeaf.isPeeled() || oldLeaf.getObjectId() == null) {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsStreamKey.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsStreamKey.java
index c11f696..8793d83 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsStreamKey.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsStreamKey.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.internal.storage.dfs;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.util.Arrays;
 
@@ -67,7 +67,7 @@
 	 */
 	public static DfsStreamKey of(DfsRepositoryDescription repo, String name,
 			@Nullable PackExt ext) {
-		return new ByteArrayDfsStreamKey(repo, name.getBytes(CHARSET), ext);
+		return new ByteArrayDfsStreamKey(repo, name.getBytes(UTF_8), ext);
 	}
 
 	final int hash;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/InMemoryRepository.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/InMemoryRepository.java
index 662c3fe..5b6894d 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/InMemoryRepository.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/InMemoryRepository.java
@@ -10,6 +10,7 @@
 import java.util.concurrent.atomic.AtomicInteger;
 
 import org.eclipse.jgit.annotations.Nullable;
+import org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource;
 import org.eclipse.jgit.internal.storage.pack.PackExt;
 import org.eclipse.jgit.internal.storage.reftable.ReftableConfig;
 import org.eclipse.jgit.lib.RefDatabase;
@@ -118,10 +119,10 @@
 		@Override
 		protected DfsPackDescription newPack(PackSource source) {
 			int id = packId.incrementAndGet();
-			DfsPackDescription desc = new MemPack(
+			return new MemPack(
 					"pack-" + id + "-" + source.name(), //$NON-NLS-1$ //$NON-NLS-2$
-					getRepository().getDescription());
-			return desc.setPackSource(source);
+					getRepository().getDescription(),
+					source);
 		}
 
 		@Override
@@ -169,8 +170,8 @@
 	private static class MemPack extends DfsPackDescription {
 		final byte[][] fileMap = new byte[PackExt.values().length][];
 
-		MemPack(String name, DfsRepositoryDescription repoDesc) {
-			super(repoDesc, name);
+		MemPack(String name, DfsRepositoryDescription repoDesc, PackSource source) {
+			super(repoDesc, name, source);
 		}
 
 		void put(PackExt ext, byte[] data) {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/ReftableBatchRefUpdate.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/ReftableBatchRefUpdate.java
index e0c056a..47ac4ec 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/ReftableBatchRefUpdate.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/ReftableBatchRefUpdate.java
@@ -70,7 +70,6 @@
 import org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource;
 import org.eclipse.jgit.internal.storage.io.BlockSource;
 import org.eclipse.jgit.internal.storage.pack.PackExt;
-import org.eclipse.jgit.internal.storage.reftable.RefCursor;
 import org.eclipse.jgit.internal.storage.reftable.Reftable;
 import org.eclipse.jgit.internal.storage.reftable.ReftableCompactor;
 import org.eclipse.jgit.internal.storage.reftable.ReftableConfig;
@@ -240,11 +239,7 @@
 	private boolean checkExpected(Reftable table, List<ReceiveCommand> pending)
 			throws IOException {
 		for (ReceiveCommand cmd : pending) {
-			Ref ref;
-			try (RefCursor rc = table.seekRef(cmd.getRefName())) {
-				ref = rc.next() ? rc.getRef() : null;
-			}
-			if (!matchOld(cmd, ref)) {
+			if (!matchOld(cmd, table.exactRef(cmd.getRefName()))) {
 				cmd.setResult(LOCK_FAILURE);
 				if (isAtomic()) {
 					ReceiveCommand.abort(pending);
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/BasePackBitmapIndex.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/BasePackBitmapIndex.java
index 407061f..3884180 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/BasePackBitmapIndex.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/BasePackBitmapIndex.java
@@ -104,6 +104,7 @@
 				r = xb.xorBitmap.bitmapContainer;
 				if (r instanceof EWAHCompressedBitmap) {
 					out = out.xor((EWAHCompressedBitmap) r);
+					out.trim();
 					bitmapContainer = out;
 					return out;
 				}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/FileRepository.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/FileRepository.java
index d02888a..5ced686 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/FileRepository.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/FileRepository.java
@@ -480,7 +480,7 @@
 	/**
 	 * {@inheritDoc}
 	 * <p>
-	 * Objects known to exist but not expressed by {@link #getAllRefs()}.
+	 * Objects known to exist but not expressed by {@code #getAllRefs()}.
 	 * <p>
 	 * When a repository borrows objects from another repository, it can
 	 * advertise that it safely has that other repository's references, without
@@ -493,12 +493,12 @@
 	}
 
 	/**
-	 * Objects known to exist but not expressed by {@link #getAllRefs()}.
+	 * Objects known to exist but not expressed by {@code #getAllRefs()}.
 	 * <p>
 	 * When a repository borrows objects from another repository, it can
 	 * advertise that it safely has that other repository's references, without
-	 * exposing any other details about the other repository.  This may help
-	 * a client trying to push changes avoid pushing more than it needs to.
+	 * exposing any other details about the other repository. This may help a
+	 * client trying to push changes avoid pushing more than it needs to.
 	 *
 	 * @param skips
 	 *            Set of AlternateHandle Ids already seen
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java
index 0ecfb28..7bfec3f 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java
@@ -245,6 +245,7 @@
 	 *             parsed
 	 */
 	// TODO(ms): in 5.0 change signature and return Future<Collection<PackFile>>
+	@SuppressWarnings("FutureReturnValueIgnored")
 	public Collection<PackFile> gc() throws IOException, ParseException {
 		if (!background) {
 			return doGc();
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GcLog.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GcLog.java
index 0e587ce..82458c1 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GcLog.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GcLog.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.internal.storage.file;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.File;
 import java.io.IOException;
@@ -171,6 +171,6 @@
 		if (content.length() > 0) {
 			nonEmpty = true;
 		}
-		lock.write(content.getBytes(CHARSET));
+		lock.write(content.getBytes(UTF_8));
 	}
 }
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/LazyObjectIdSetFile.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/LazyObjectIdSetFile.java
index c82d52e..3d0e9c7 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/LazyObjectIdSetFile.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/LazyObjectIdSetFile.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.internal.storage.file;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.BufferedReader;
 import java.io.File;
@@ -86,7 +86,7 @@
 	private ObjectIdOwnerMap<Entry> load() {
 		ObjectIdOwnerMap<Entry> r = new ObjectIdOwnerMap<>();
 		try (FileInputStream fin = new FileInputStream(src);
-				Reader rin = new InputStreamReader(fin, CHARSET);
+				Reader rin = new InputStreamReader(fin, UTF_8);
 				BufferedReader br = new BufferedReader(rin)) {
 			MutableObjectId id = new MutableObjectId();
 			for (String line; (line = br.readLine()) != null;) {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/LocalCachedPack.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/LocalCachedPack.java
index 289d89d..e931c1f 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/LocalCachedPack.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/LocalCachedPack.java
@@ -62,13 +62,13 @@
 
 	LocalCachedPack(ObjectDirectory odb, List<String> packNames) {
 		this.odb = odb;
-		this.packNames = packNames.toArray(new String[packNames.size()]);
+		this.packNames = packNames.toArray(new String[0]);
 	}
 
 	LocalCachedPack(List<PackFile> packs) {
 		odb = null;
 		packNames = null;
-		this.packs = packs.toArray(new PackFile[packs.size()]);
+		this.packs = packs.toArray(new PackFile[0]);
 	}
 
 	/** {@inheritDoc} */
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/ObjectDirectory.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/ObjectDirectory.java
index 51c5702..24723d8 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/ObjectDirectory.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/ObjectDirectory.java
@@ -938,7 +938,7 @@
 		if (list.isEmpty())
 			return new PackList(snapshot, NO_PACKS.packs);
 
-		final PackFile[] r = list.toArray(new PackFile[list.size()]);
+		final PackFile[] r = list.toArray(new PackFile[0]);
 		Arrays.sort(r, PackFile.SORT);
 		return new PackList(snapshot, r);
 	}
@@ -1030,7 +1030,7 @@
 				l.add(openAlternate(line));
 			}
 		}
-		return l.toArray(new AlternateHandle[l.size()]);
+		return l.toArray(new AlternateHandle[0]);
 	}
 
 	private static BufferedReader open(File f)
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackBitmapIndexBuilder.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackBitmapIndexBuilder.java
index 70eb10e..eff7958 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackBitmapIndexBuilder.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackBitmapIndexBuilder.java
@@ -351,6 +351,7 @@
 						PositionEntry entry = positionEntries.get(item);
 						if (entry == null)
 							throw new IllegalStateException();
+						bestBitmap.trim();
 						return new StoredEntry(entry.namePosition, bestBitmap,
 								bestXorOffset, item.getFlags());
 					}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackBitmapIndexRemapper.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackBitmapIndexRemapper.java
index c04c90f..7069588 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackBitmapIndexRemapper.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackBitmapIndexRemapper.java
@@ -200,6 +200,7 @@
 		for (IntIterator i = oldBitmap.getBitmap().intIterator(); i.hasNext();)
 			inflated.set(prevToNewMapping[i.next()]);
 		bitmap = inflated.toEWAHCompressedBitmap();
+		bitmap.trim();
 		convertedBitmaps.add(
 				new StoredBitmap(objectId, bitmap, null, oldBitmap.getFlags()));
 		return bitmap;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/RefDirectory.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/RefDirectory.java
index 6a18df8..de7e4b3 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/RefDirectory.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/RefDirectory.java
@@ -46,7 +46,7 @@
 
 package org.eclipse.jgit.internal.storage.file;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.lib.Constants.HEAD;
 import static org.eclipse.jgit.lib.Constants.LOGS;
 import static org.eclipse.jgit.lib.Constants.OBJECT_ID_STRING_LENGTH;
@@ -945,7 +945,7 @@
 			try (BufferedReader br = new BufferedReader(new InputStreamReader(
 					new DigestInputStream(new FileInputStream(packedRefsFile),
 							digest),
-					CHARSET))) {
+					UTF_8))) {
 				try {
 					return new PackedRefList(parsePackedRefs(br), snapshot,
 							ObjectId.fromRaw(digest.digest()));
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/BaseSearch.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/BaseSearch.java
index d231ccb..f42b3a5 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/BaseSearch.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/BaseSearch.java
@@ -91,7 +91,7 @@
 			List<ObjectToPack> edges, ObjectReader or) {
 		progress = countingMonitor;
 		reader = or;
-		baseTrees = bases.toArray(new ObjectId[bases.size()]);
+		baseTrees = bases.toArray(new ObjectId[0]);
 		objectsMap = objects;
 		edgeObjects = edges;
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriter.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriter.java
index 36d6f0a..24af8a7 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriter.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriter.java
@@ -1970,7 +1970,7 @@
 				byte[] pathBuf = walker.getPathBuffer();
 				int pathLen = walker.getPathLength();
 				bases.addBase(o.getType(), pathBuf, pathLen, pathHash);
-				filterAndAddObject(o, o.getType(), pathHash);
+				filterAndAddObject(o, o.getType(), pathHash, want);
 				countingMonitor.update(1);
 			}
 		} else {
@@ -1980,7 +1980,7 @@
 					continue;
 				if (exclude(o))
 					continue;
-				filterAndAddObject(o, o.getType(), walker.getPathHashCode());
+				filterAndAddObject(o, o.getType(), walker.getPathHashCode(), want);
 				countingMonitor.update(1);
 			}
 		}
@@ -2013,7 +2013,7 @@
 				needBitmap.remove(objectId);
 				continue;
 			}
-			filterAndAddObject(objectId, obj.getType(), 0);
+			filterAndAddObject(objectId, obj.getType(), 0, want);
 		}
 
 		if (thin)
@@ -2075,12 +2075,14 @@
 	// Adds the given object as an object to be packed, first performing
 	// filtering on blobs at or exceeding a given size.
 	private void filterAndAddObject(@NonNull AnyObjectId src, int type,
-			int pathHashCode) throws IOException {
+			int pathHashCode, @NonNull Set<? extends AnyObjectId> want)
+			throws IOException {
 
 		// Check if this object needs to be rejected, doing the cheaper
 		// checks first.
 		boolean reject = filterBlobLimit >= 0 &&
 			type == OBJ_BLOB &&
+			!want.contains(src) &&
 			reader.getObjectSize(src, OBJ_BLOB) > filterBlobLimit;
 		if (!reject) {
 			addObject(src, type, pathHashCode);
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriterBitmapPreparer.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriterBitmapPreparer.java
index 38d3458..99db749 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriterBitmapPreparer.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriterBitmapPreparer.java
@@ -91,11 +91,10 @@
 
 	private static final int DAY_IN_SECONDS = 24 * 60 * 60;
 
-	private static final Comparator<BitmapBuilderEntry> ORDER_BY_CARDINALITY = new Comparator<BitmapBuilderEntry>() {
+	private static final Comparator<RevCommit> ORDER_BY_REVERSE_TIMESTAMP = new Comparator<RevCommit>() {
 		@Override
-		public int compare(BitmapBuilderEntry a, BitmapBuilderEntry b) {
-			return Integer.signum(a.getBuilder().cardinality()
-					- b.getBuilder().cardinality());
+		public int compare(RevCommit a, RevCommit b) {
+			return Integer.signum(b.getCommitTime() - a.getCommitTime());
 		}
 	};
 
@@ -164,154 +163,177 @@
 		 * the cache hits for clients that are close to HEAD, which is the
 		 * majority of calculations performed.
 		 */
-		pm.beginTask(JGitText.get().selectingCommits, ProgressMonitor.UNKNOWN);
-		RevWalk rw = new RevWalk(reader);
-		rw.setRetainBody(false);
-		CommitSelectionHelper selectionHelper = setupTipCommitBitmaps(rw,
-				expectedCommitCount, excludeFromBitmapSelection);
-		pm.endTask();
+		try (RevWalk rw = new RevWalk(reader);
+				RevWalk rw2 = new RevWalk(reader)) {
+			pm.beginTask(JGitText.get().selectingCommits,
+					ProgressMonitor.UNKNOWN);
+			rw.setRetainBody(false);
+			CommitSelectionHelper selectionHelper = captureOldAndNewCommits(rw,
+					expectedCommitCount, excludeFromBitmapSelection);
+			pm.endTask();
 
-		int totCommits = selectionHelper.getCommitCount();
-		BlockList<BitmapCommit> selections = new BlockList<>(
-				totCommits / recentCommitSpan + 1);
-		for (BitmapCommit reuse : selectionHelper.reusedCommits) {
-			selections.add(reuse);
-		}
-
-		if (totCommits == 0) {
-			for (AnyObjectId id : selectionHelper.peeledWants) {
-				selections.add(new BitmapCommit(id, false, 0));
-			}
-			return selections;
-		}
-
-		pm.beginTask(JGitText.get().selectingCommits, totCommits);
-		int totalWants = selectionHelper.peeledWants.size();
-
-		for (BitmapBuilderEntry entry : selectionHelper.tipCommitBitmaps) {
-			BitmapBuilder bitmap = entry.getBuilder();
-			int cardinality = bitmap.cardinality();
-
-			// Within this branch, keep ordered lists of commits representing
-			// chains in its history, where each chain is a "sub-branch".
-			// Ordering commits by these chains makes for fewer differences
-			// between consecutive selected commits, which in turn provides
-			// better compression/on the run-length encoding of the XORs between
-			// them.
-			List<List<BitmapCommit>> chains =
-					new ArrayList<>();
-
-			// Mark the current branch as inactive if its tip commit isn't
-			// recent and there are an excessive number of branches, to
-			// prevent memory bloat of computing too many bitmaps for stale
-			// branches.
-			boolean isActiveBranch = true;
-			if (totalWants > excessiveBranchCount
-					&& !isRecentCommit(entry.getCommit())) {
-				isActiveBranch = false;
+			// Add reused bitmaps from the previous GC pack's bitmap indices.
+			// Currently they are always fully reused, even if their spans don't
+			// match this run's PackConfig values.
+			int newCommits = selectionHelper.getCommitCount();
+			BlockList<BitmapCommit> selections = new BlockList<>(
+					selectionHelper.reusedCommits.size()
+							+ newCommits / recentCommitSpan + 1);
+			for (BitmapCommit reuse : selectionHelper.reusedCommits) {
+				selections.add(reuse);
 			}
 
-			// Insert bitmaps at the offsets suggested by the
-			// nextSelectionDistance() heuristic. Only reuse bitmaps created
-			// for more distant commits.
-			int index = -1;
-			int nextIn = nextSpan(cardinality);
-			int nextFlg = nextIn == distantCommitSpan
-					? PackBitmapIndex.FLAG_REUSE : 0;
+			if (newCommits == 0) {
+				for (AnyObjectId id : selectionHelper.newWants) {
+					selections.add(new BitmapCommit(id, false, 0));
+				}
+				return selections;
+			}
 
-			// For the current branch, iterate through all commits from oldest
-			// to newest.
-			for (RevCommit c : selectionHelper) {
-				// Optimization: if we have found all the commits for this
-				// branch, stop searching
-				int distanceFromTip = cardinality - index - 1;
-				if (distanceFromTip == 0) {
-					break;
+			pm.beginTask(JGitText.get().selectingCommits, newCommits);
+			int totalWants = want.size();
+			BitmapBuilder seen = commitBitmapIndex.newBitmapBuilder();
+			seen.or(selectionHelper.reusedCommitsBitmap);
+			rw2.setRetainBody(false);
+			rw2.setRevFilter(new NotInBitmapFilter(seen));
+
+			// For each branch, do a revwalk to enumerate its commits. Exclude
+			// both reused commits and any commits seen in a previous branch.
+			// Then iterate through all new commits from oldest to newest,
+			// selecting well-spaced commits in this branch.
+			for (RevCommit rc : selectionHelper.newWantsByNewest) {
+				BitmapBuilder tipBitmap = commitBitmapIndex.newBitmapBuilder();
+				rw2.markStart((RevCommit) rw2.peel(rw2.parseAny(rc)));
+				RevCommit rc2;
+				while ((rc2 = rw2.next()) != null) {
+					tipBitmap.addObject(rc2, Constants.OBJ_COMMIT);
+				}
+				int cardinality = tipBitmap.cardinality();
+				seen.or(tipBitmap);
+
+				// Within this branch, keep ordered lists of commits
+				// representing chains in its history, where each chain is a
+				// "sub-branch". Ordering commits by these chains makes for
+				// fewer differences between consecutive selected commits, which
+				// in turn provides better compression/on the run-length
+				// encoding of the XORs between them.
+				List<List<BitmapCommit>> chains = new ArrayList<>();
+
+				// Mark the current branch as inactive if its tip commit isn't
+				// recent and there are an excessive number of branches, to
+				// prevent memory bloat of computing too many bitmaps for stale
+				// branches.
+				boolean isActiveBranch = true;
+				if (totalWants > excessiveBranchCount && !isRecentCommit(rc)) {
+					isActiveBranch = false;
 				}
 
-				// Ignore commits that are not in this branch
-				if (!bitmap.contains(c)) {
-					continue;
-				}
+				// Insert bitmaps at the offsets suggested by the
+				// nextSelectionDistance() heuristic. Only reuse bitmaps created
+				// for more distant commits.
+				int index = -1;
+				int nextIn = nextSpan(cardinality);
+				int nextFlg = nextIn == distantCommitSpan
+						? PackBitmapIndex.FLAG_REUSE
+						: 0;
 
-				index++;
-				nextIn--;
-				pm.update(1);
-
-				// Always pick the items in wants, prefer merge commits.
-				if (selectionHelper.peeledWants.remove(c)) {
-					if (nextIn > 0) {
-						nextFlg = 0;
+				// For the current branch, iterate through all commits from
+				// oldest to newest.
+				for (RevCommit c : selectionHelper) {
+					// Optimization: if we have found all the commits for this
+					// branch, stop searching
+					int distanceFromTip = cardinality - index - 1;
+					if (distanceFromTip == 0) {
+						break;
 					}
-				} else {
-					boolean stillInSpan = nextIn >= 0;
-					boolean isMergeCommit = c.getParentCount() > 1;
-					// Force selection if:
-					// a) we have exhausted the window looking for merges
-					// b) we are in the top commits of an active branch
-					// c) we are at a branch tip
-					boolean mustPick = (nextIn <= -recentCommitSpan)
-							|| (isActiveBranch
-									&& (distanceFromTip <= contiguousCommitCount))
-							|| (distanceFromTip == 1); // most recent commit
-					if (!mustPick && (stillInSpan || !isMergeCommit)) {
+
+					// Ignore commits that are not in this branch
+					if (!tipBitmap.contains(c)) {
 						continue;
 					}
-				}
 
-				// This commit is selected.
-				// Calculate where to look for the next one.
-				int flags = nextFlg;
-				nextIn = nextSpan(distanceFromTip);
-				nextFlg = nextIn == distantCommitSpan
-						? PackBitmapIndex.FLAG_REUSE : 0;
+					index++;
+					nextIn--;
+					pm.update(1);
 
-				BitmapBuilder fullBitmap = commitBitmapIndex.newBitmapBuilder();
-				rw.reset();
-				rw.markStart(c);
-				rw.setRevFilter(new AddUnseenToBitmapFilter(
-						selectionHelper.reusedCommitsBitmap, fullBitmap));
-
-				while (rw.next() != null) {
-					// The RevFilter adds the reachable commits from this
-					// selected commit to fullBitmap.
-				}
-
-				// Sort the commits by independent chains in this branch's
-				// history, yielding better compression when building bitmaps.
-				List<BitmapCommit> longestAncestorChain = null;
-				for (List<BitmapCommit> chain : chains) {
-					BitmapCommit mostRecentCommit = chain.get(chain.size() - 1);
-					if (fullBitmap.contains(mostRecentCommit)) {
-						if (longestAncestorChain == null
-								|| longestAncestorChain.size() < chain.size()) {
-							longestAncestorChain = chain;
+					// Always pick the items in wants, prefer merge commits.
+					if (selectionHelper.newWants.remove(c)) {
+						if (nextIn > 0) {
+							nextFlg = 0;
+						}
+					} else {
+						boolean stillInSpan = nextIn >= 0;
+						boolean isMergeCommit = c.getParentCount() > 1;
+						// Force selection if:
+						// a) we have exhausted the window looking for merges
+						// b) we are in the top commits of an active branch
+						// c) we are at a branch tip
+						boolean mustPick = (nextIn <= -recentCommitSpan)
+								|| (isActiveBranch
+										&& (distanceFromTip <= contiguousCommitCount))
+								|| (distanceFromTip == 1); // most recent commit
+						if (!mustPick && (stillInSpan || !isMergeCommit)) {
+							continue;
 						}
 					}
+
+					// This commit is selected.
+					// Calculate where to look for the next one.
+					int flags = nextFlg;
+					nextIn = nextSpan(distanceFromTip);
+					nextFlg = nextIn == distantCommitSpan
+							? PackBitmapIndex.FLAG_REUSE
+							: 0;
+
+					// Create the commit bitmap for the current commit
+					BitmapBuilder bitmap = commitBitmapIndex.newBitmapBuilder();
+					rw.reset();
+					rw.markStart(c);
+					rw.setRevFilter(new AddUnseenToBitmapFilter(
+							selectionHelper.reusedCommitsBitmap, bitmap));
+					while (rw.next() != null) {
+						// The filter adds the reachable commits to bitmap.
+					}
+
+					// Sort the commits by independent chains in this branch's
+					// history, yielding better compression when building
+					// bitmaps.
+					List<BitmapCommit> longestAncestorChain = null;
+					for (List<BitmapCommit> chain : chains) {
+						BitmapCommit mostRecentCommit = chain
+								.get(chain.size() - 1);
+						if (bitmap.contains(mostRecentCommit)) {
+							if (longestAncestorChain == null
+									|| longestAncestorChain.size() < chain
+											.size()) {
+								longestAncestorChain = chain;
+							}
+						}
+					}
+
+					if (longestAncestorChain == null) {
+						longestAncestorChain = new ArrayList<>();
+						chains.add(longestAncestorChain);
+					}
+					longestAncestorChain.add(new BitmapCommit(c,
+							!longestAncestorChain.isEmpty(), flags));
+					writeBitmaps.addBitmap(c, bitmap, 0);
 				}
 
-				if (longestAncestorChain == null) {
-					longestAncestorChain = new ArrayList<>();
-					chains.add(longestAncestorChain);
+				for (List<BitmapCommit> chain : chains) {
+					selections.addAll(chain);
 				}
-				longestAncestorChain.add(new BitmapCommit(
-						c, !longestAncestorChain.isEmpty(), flags));
-				writeBitmaps.addBitmap(c, fullBitmap, 0);
+			}
+			writeBitmaps.clearBitmaps(); // Remove the temporary commit bitmaps.
+
+			// Add the remaining peeledWant
+			for (AnyObjectId remainingWant : selectionHelper.newWants) {
+				selections.add(new BitmapCommit(remainingWant, false, 0));
 			}
 
-			for (List<BitmapCommit> chain : chains) {
-				selections.addAll(chain);
-			}
+			pm.endTask();
+			return selections;
 		}
-		writeBitmaps.clearBitmaps(); // Remove the temporary commit bitmaps.
-
-		// Add the remaining peeledWant
-		for (AnyObjectId remainingWant : selectionHelper.peeledWants) {
-			selections.add(new BitmapCommit(remainingWant, false, 0));
-		}
-
-		pm.endTask();
-		return selections;
 	}
 
 	private boolean isRecentCommit(RevCommit revCommit) {
@@ -358,9 +380,8 @@
 	}
 
 	/**
-	 * For each of the {@code want}s, which represent the tip commit of each
-	 * branch, set up an initial {@link BitmapBuilder}. Reuse previously built
-	 * bitmaps if possible.
+	 * Records which of the {@code wants} can be found in the previous GC pack's
+	 * bitmap indices and which are new.
 	 *
 	 * @param rw
 	 *            a {@link RevWalk} to find reachable objects in this repository
@@ -369,8 +390,9 @@
 	 *            unreachable garbage.
 	 * @param excludeFromBitmapSelection
 	 *            commits that should be excluded from bitmap selection
-	 * @return a {@link CommitSelectionHelper} containing bitmaps for the tip
-	 *         commits
+	 * @return a {@link CommitSelectionHelper} capturing which commits are
+	 *         covered by a previous pack's bitmaps and which new commits need
+	 *         bitmap coverage
 	 * @throws IncorrectObjectTypeException
 	 *             if any of the processed objects is not a commit
 	 * @throws IOException
@@ -378,11 +400,12 @@
 	 * @throws MissingObjectException
 	 *             if an expected object is missing
 	 */
-	private CommitSelectionHelper setupTipCommitBitmaps(RevWalk rw,
+	private CommitSelectionHelper captureOldAndNewCommits(RevWalk rw,
 			int expectedCommitCount,
 			Set<? extends ObjectId> excludeFromBitmapSelection)
 			throws IncorrectObjectTypeException, IOException,
 			MissingObjectException {
+		// Track bitmaps and commits from the previous GC pack bitmap indices.
 		BitmapBuilder reuse = commitBitmapIndex.newBitmapBuilder();
 		List<BitmapCommit> reuseCommits = new ArrayList<>();
 		for (PackBitmapIndexRemapper.Entry entry : bitmapRemapper) {
@@ -404,11 +427,10 @@
 			}
 		}
 
-		// Add branch tips that are not represented in old bitmap indices. Set
-		// up the RevWalk to walk the new commits not in the old packs.
-		List<BitmapBuilderEntry> tipCommitBitmaps = new ArrayList<>(
-				want.size());
-		Set<RevCommit> peeledWant = new HashSet<>(want.size());
+		// Add branch tips that are not represented in a previous pack's bitmap
+		// indices. Set up a RevWalk to find new commits not in the old packs.
+		List<RevCommit> newWantsByNewest = new ArrayList<>(want.size());
+		Set<RevCommit> newWants = new HashSet<>(want.size());
 		for (AnyObjectId objectId : want) {
 			RevObject ro = rw.peel(rw.parseAny(objectId));
 			if (!(ro instanceof RevCommit) || reuse.contains(ro)
@@ -417,59 +439,26 @@
 			}
 
 			RevCommit rc = (RevCommit) ro;
-			peeledWant.add(rc);
 			rw.markStart(rc);
-
-			BitmapBuilder bitmap = commitBitmapIndex.newBitmapBuilder();
-			bitmap.addObject(rc, Constants.OBJ_COMMIT);
-			tipCommitBitmaps.add(new BitmapBuilderEntry(rc, bitmap));
+			newWants.add(rc);
+			newWantsByNewest.add(rc);
 		}
 
-		// Create a list of commits in reverse order (older to newer).
-		// For each branch that contains the commit, mark its parents as being
-		// in the bitmap.
+		// Create a list of commits in reverse order (older to newer) that are
+		// not in the previous bitmap indices and are reachable.
 		rw.setRevFilter(new NotInBitmapFilter(reuse));
 		RevCommit[] commits = new RevCommit[expectedCommitCount];
 		int pos = commits.length;
 		RevCommit rc;
 		while ((rc = rw.next()) != null && pos > 0) {
 			commits[--pos] = rc;
-			for (BitmapBuilderEntry entry : tipCommitBitmaps) {
-				BitmapBuilder bitmap = entry.getBuilder();
-				if (!bitmap.contains(rc)) {
-					continue;
-				}
-				for (RevCommit c : rc.getParents()) {
-					if (reuse.contains(c)) {
-						continue;
-					}
-					bitmap.addObject(c, Constants.OBJ_COMMIT);
-				}
-			}
 			pm.update(1);
 		}
 
-		// Sort the tip commit bitmaps. Find the one containing the most
-		// commits, remove those commits from the remaining bitmaps, resort and
-		// repeat.
-		List<BitmapBuilderEntry> orderedTipCommitBitmaps = new ArrayList<>(
-				tipCommitBitmaps.size());
-		while (!tipCommitBitmaps.isEmpty()) {
-			BitmapBuilderEntry largest =
-					Collections.max(tipCommitBitmaps, ORDER_BY_CARDINALITY);
-			tipCommitBitmaps.remove(largest);
-			orderedTipCommitBitmaps.add(largest);
-
-			// Update the remaining paths, by removing the objects from
-			// the path that was just added.
-			for (int i = tipCommitBitmaps.size() - 1; i >= 0; i--) {
-				tipCommitBitmaps.get(i).getBuilder()
-						.andNot(largest.getBuilder());
-			}
-		}
-
-		return new CommitSelectionHelper(peeledWant, commits, pos,
-				orderedTipCommitBitmaps, reuse, reuseCommits);
+		// Sort the new wants by reverse commit time.
+		Collections.sort(newWantsByNewest, ORDER_BY_REVERSE_TIMESTAMP);
+		return new CommitSelectionHelper(newWants, commits, pos,
+				newWantsByNewest, reuse, reuseCommits);
 	}
 
 	/*-
@@ -537,54 +526,36 @@
 	}
 
 	/**
-	 * A POJO representing a Pair<RevCommit, BitmapBuidler>.
-	 */
-	private static final class BitmapBuilderEntry {
-		private final RevCommit commit;
-		private final BitmapBuilder builder;
-
-		BitmapBuilderEntry(RevCommit commit, BitmapBuilder builder) {
-			this.commit = commit;
-			this.builder = builder;
-		}
-
-		RevCommit getCommit() {
-			return commit;
-		}
-
-		BitmapBuilder getBuilder() {
-			return builder;
-		}
-	}
-
-	/**
 	 * Container for state used in the first phase of selecting commits, which
-	 * walks all of the reachable commits via the branch tips (
-	 * {@code peeledWants}), stores them in {@code commitsByOldest}, and sets up
-	 * bitmaps for each branch tip ({@code tipCommitBitmaps}).
-	 * {@code commitsByOldest} is initialized with an expected size of all
-	 * commits, but may be smaller if some commits are unreachable, in which
-	 * case {@code commitStartPos} will contain a positive offset to the root
-	 * commit.
+	 * walks all of the reachable commits via the branch tips that are not
+	 * covered by a previous pack's bitmaps ({@code newWants}) and stores them
+	 * in {@code newCommitsByOldest}. {@code newCommitsByOldest} is initialized
+	 * with an expected size of all commits, but may be smaller if some commits
+	 * are unreachable and/or some commits are covered by a previous pack's
+	 * bitmaps. {@code commitStartPos} will contain a positive offset to either
+	 * the root commit or the oldest commit not covered by previous bitmaps.
 	 */
 	private static final class CommitSelectionHelper implements Iterable<RevCommit> {
-		final Set<? extends ObjectId> peeledWants;
-		final List<BitmapBuilderEntry> tipCommitBitmaps;
+		final Set<? extends ObjectId> newWants;
 
+		final List<RevCommit> newWantsByNewest;
 		final BitmapBuilder reusedCommitsBitmap;
-		final Iterable<BitmapCommit> reusedCommits;
-		final RevCommit[] commitsByOldest;
-		final int commitStartPos;
 
-		CommitSelectionHelper(Set<? extends ObjectId> peeledWant,
+		final List<BitmapCommit> reusedCommits;
+
+		final RevCommit[] newCommitsByOldest;
+
+		final int newCommitStartPos;
+
+		CommitSelectionHelper(Set<? extends ObjectId> newWants,
 				RevCommit[] commitsByOldest, int commitStartPos,
-				List<BitmapBuilderEntry> bitmapEntries,
+				List<RevCommit> newWantsByNewest,
 				BitmapBuilder reusedCommitsBitmap,
-				Iterable<BitmapCommit> reuse) {
-			this.peeledWants = peeledWant;
-			this.commitsByOldest = commitsByOldest;
-			this.commitStartPos = commitStartPos;
-			this.tipCommitBitmaps = bitmapEntries;
+				List<BitmapCommit> reuse) {
+			this.newWants = newWants;
+			this.newCommitsByOldest = commitsByOldest;
+			this.newCommitStartPos = commitStartPos;
+			this.newWantsByNewest = newWantsByNewest;
 			this.reusedCommitsBitmap = reusedCommitsBitmap;
 			this.reusedCommits = reuse;
 		}
@@ -594,16 +565,16 @@
 			// Member variables referenced by this iterator will have synthetic
 			// accessors generated for them if they are made private.
 			return new Iterator<RevCommit>() {
-				int pos = commitStartPos;
+				int pos = newCommitStartPos;
 
 				@Override
 				public boolean hasNext() {
-					return pos < commitsByOldest.length;
+					return pos < newCommitsByOldest.length;
 				}
 
 				@Override
 				public RevCommit next() {
-					return commitsByOldest[pos++];
+					return newCommitsByOldest[pos++];
 				}
 
 				@Override
@@ -614,7 +585,7 @@
 		}
 
 		int getCommitCount() {
-			return commitsByOldest.length - commitStartPos;
+			return newCommitsByOldest.length - newCommitStartPos;
 		}
 	}
 }
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/BlockReader.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/BlockReader.java
index 942d72f..ce2ba4a 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/BlockReader.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/BlockReader.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.internal.storage.reftable;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.internal.storage.reftable.BlockWriter.compare;
 import static org.eclipse.jgit.internal.storage.reftable.ReftableConstants.FILE_BLOCK_TYPE;
 import static org.eclipse.jgit.internal.storage.reftable.ReftableConstants.FILE_HEADER_LEN;
@@ -138,7 +138,7 @@
 		if (blockType == LOG_BLOCK_TYPE) {
 			len -= 9;
 		}
-		return RawParseUtils.decode(CHARSET, nameBuf, 0, len);
+		return RawParseUtils.decode(UTF_8, nameBuf, 0, len);
 	}
 
 	boolean match(byte[] match, boolean matchIsPrefix) {
@@ -171,7 +171,7 @@
 	}
 
 	Ref readRef() throws IOException {
-		String name = RawParseUtils.decode(CHARSET, nameBuf, 0, nameLen);
+		String name = RawParseUtils.decode(UTF_8, nameBuf, 0, nameLen);
 		switch (valueType & VALUE_TYPE_MASK) {
 		case VALUE_NONE: // delete
 			return newRef(name);
@@ -266,7 +266,7 @@
 	private String readValueString() {
 		int len = readVarint32();
 		int end = ptr + len;
-		String s = RawParseUtils.decode(CHARSET, buf, ptr, end);
+		String s = RawParseUtils.decode(UTF_8, buf, ptr, end);
 		ptr = end;
 		return s;
 	}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/BlockWriter.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/BlockWriter.java
index 3d8fbf4..b3173e8 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/BlockWriter.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/BlockWriter.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.internal.storage.reftable;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.internal.storage.reftable.ReftableConstants.FILE_HEADER_LEN;
 import static org.eclipse.jgit.internal.storage.reftable.ReftableConstants.INDEX_BLOCK_TYPE;
 import static org.eclipse.jgit.internal.storage.reftable.ReftableConstants.LOG_BLOCK_TYPE;
@@ -440,7 +440,7 @@
 		}
 
 		private static byte[] nameUtf8(Ref ref) {
-			return ref.getName().getBytes(CHARSET);
+			return ref.getName().getBytes(UTF_8);
 		}
 	}
 
@@ -559,13 +559,13 @@
 			this.newId = newId;
 			this.timeSecs = who.getWhen().getTime() / 1000L;
 			this.tz = (short) who.getTimeZoneOffset();
-			this.name = who.getName().getBytes(CHARSET);
-			this.email = who.getEmailAddress().getBytes(CHARSET);
-			this.msg = message.getBytes(CHARSET);
+			this.name = who.getName().getBytes(UTF_8);
+			this.email = who.getEmailAddress().getBytes(UTF_8);
+			this.msg = message.getBytes(UTF_8);
 		}
 
 		static byte[] key(String ref, long index) {
-			byte[] name = ref.getBytes(CHARSET);
+			byte[] name = ref.getBytes(UTF_8);
 			byte[] key = Arrays.copyOf(name, name.length + 1 + 8);
 			NB.encodeInt64(key, key.length - 8, reverseUpdateIndex(index));
 			return key;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/MergedReftable.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/MergedReftable.java
index ef686a3..17894b1 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/MergedReftable.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/MergedReftable.java
@@ -113,6 +113,16 @@
 
 	/** {@inheritDoc} */
 	@Override
+	public RefCursor seekRefsWithPrefix(String prefix) throws IOException {
+		MergedRefCursor m = new MergedRefCursor();
+		for (int i = 0; i < tables.length; i++) {
+			m.add(new RefQueueEntry(tables[i].seekRefsWithPrefix(prefix), i));
+		}
+		return m;
+	}
+
+	/** {@inheritDoc} */
+	@Override
 	public RefCursor byObjectId(AnyObjectId name) throws IOException {
 		MergedRefCursor m = new MergedRefCursor();
 		for (int i = 0; i < tables.length; i++) {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/Reftable.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/Reftable.java
index 510c1a1..a1087e2 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/Reftable.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/Reftable.java
@@ -108,18 +108,14 @@
 	public abstract RefCursor allRefs() throws IOException;
 
 	/**
-	 * Seek either to a reference, or a reference subtree.
+	 * Seek to a reference.
 	 * <p>
-	 * If {@code refName} ends with {@code "/"} the method will seek to the
-	 * subtree of all references starting with {@code refName} as a prefix. If
-	 * no references start with this prefix, an empty cursor is returned.
-	 * <p>
-	 * Otherwise exactly {@code refName} will be looked for. If present, the
+	 * This method will seek to the reference {@code refName}. If present, the
 	 * returned cursor will iterate exactly one entry. If not found, an empty
 	 * cursor is returned.
 	 *
 	 * @param refName
-	 *            reference name or subtree to find.
+	 *            reference name.
 	 * @return cursor to iterate; empty cursor if no references match.
 	 * @throws java.io.IOException
 	 *             if references cannot be read.
@@ -127,6 +123,21 @@
 	public abstract RefCursor seekRef(String refName) throws IOException;
 
 	/**
+	 * Seek references with prefix.
+	 * <p>
+	 * The method will seek all the references starting with {@code prefix} as a
+	 * prefix. If no references start with this prefix, an empty cursor is
+	 * returned.
+	 *
+	 * @param prefix
+	 *            prefix to find.
+	 * @return cursor to iterate; empty cursor if no references match.
+	 * @throws java.io.IOException
+	 *             if references cannot be read.
+	 */
+	public abstract RefCursor seekRefsWithPrefix(String prefix) throws IOException;
+
+	/**
 	 * Match references pointing to a specific object.
 	 *
 	 * @param id
@@ -191,17 +202,11 @@
 	}
 
 	/**
-	 * Test if a reference or reference subtree exists.
-	 * <p>
-	 * If {@code refName} ends with {@code "/"}, the method tests if any
-	 * reference starts with {@code refName} as a prefix.
-	 * <p>
-	 * Otherwise, the method checks if {@code refName} exists.
+	 * Test if a reference exists.
 	 *
 	 * @param refName
 	 *            reference name or subtree to find.
-	 * @return {@code true} if the reference exists, or at least one reference
-	 *         exists in the subtree.
+	 * @return {@code true} if the reference exists.
 	 * @throws java.io.IOException
 	 *             if references cannot be read.
 	 */
@@ -212,6 +217,21 @@
 	}
 
 	/**
+	 * Test if any reference starts with {@code prefix} as a prefix.
+	 *
+	 * @param prefix
+	 *            prefix to find.
+	 * @return {@code true} if at least one reference exists with prefix.
+	 * @throws java.io.IOException
+	 *             if references cannot be read.
+	 */
+	public boolean hasRefsWithPrefix(String prefix) throws IOException {
+		try (RefCursor rc = seekRefsWithPrefix(prefix)) {
+			return rc.next();
+		}
+	}
+
+	/**
 	 * Test if any reference directly refers to the object.
 	 *
 	 * @param id
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableOutputStream.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableOutputStream.java
index 44bbb16..1fc43c9 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableOutputStream.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableOutputStream.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.internal.storage.reftable;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.internal.storage.reftable.ReftableConstants.FILE_HEADER_LEN;
 import static org.eclipse.jgit.internal.storage.reftable.ReftableConstants.INDEX_BLOCK_TYPE;
 import static org.eclipse.jgit.internal.storage.reftable.ReftableConstants.LOG_BLOCK_TYPE;
@@ -160,7 +160,7 @@
 	}
 
 	void writeVarintString(String s) {
-		writeVarintString(s.getBytes(CHARSET));
+		writeVarintString(s.getBytes(UTF_8));
 	}
 
 	void writeVarintString(byte[] msg) {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableReader.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableReader.java
index 5356952..81b30e4 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableReader.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/reftable/ReftableReader.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.internal.storage.reftable;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.internal.storage.reftable.BlockReader.decodeBlockLen;
 import static org.eclipse.jgit.internal.storage.reftable.ReftableConstants.FILE_BLOCK_TYPE;
 import static org.eclipse.jgit.internal.storage.reftable.ReftableConstants.FILE_FOOTER_LEN;
@@ -182,10 +182,19 @@
 	public RefCursor seekRef(String refName) throws IOException {
 		initRefIndex();
 
-		byte[] key = refName.getBytes(CHARSET);
-		boolean prefix = key[key.length - 1] == '/';
+		byte[] key = refName.getBytes(UTF_8);
+		RefCursorImpl i = new RefCursorImpl(refEnd, key, false);
+		i.block = seek(REF_BLOCK_TYPE, key, refIndex, 0, refEnd);
+		return i;
+	}
 
-		RefCursorImpl i = new RefCursorImpl(refEnd, key, prefix);
+	/** {@inheritDoc} */
+	@Override
+	public RefCursor seekRefsWithPrefix(String prefix) throws IOException {
+		initRefIndex();
+
+		byte[] key = prefix.getBytes(UTF_8);
+		RefCursorImpl i = new RefCursorImpl(refEnd, key, true);
 		i.block = seek(REF_BLOCK_TYPE, key, refIndex, 0, refEnd);
 		return i;
 	}
@@ -223,7 +232,7 @@
 		initLogIndex();
 		if (logPosition > 0) {
 			byte[] key = LogEntry.key(refName, updateIndex);
-			byte[] match = refName.getBytes(CHARSET);
+			byte[] match = refName.getBytes(UTF_8);
 			LogCursorImpl i = new LogCursorImpl(logEnd, match);
 			i.block = seek(LOG_BLOCK_TYPE, key, logIndex, logPosition, logEnd);
 			return i;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/BaseRepositoryBuilder.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/BaseRepositoryBuilder.java
index 2c7c6cb..d1cf1cd 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/BaseRepositoryBuilder.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/BaseRepositoryBuilder.java
@@ -283,7 +283,7 @@
 		final List<File> alts = alternateObjectDirectories;
 		if (alts == null)
 			return null;
-		return alts.toArray(new File[alts.size()]);
+		return alts.toArray(new File[0]);
 	}
 
 	/**
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/BlobBasedConfig.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/BlobBasedConfig.java
index e008be3..59154b7 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/BlobBasedConfig.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/BlobBasedConfig.java
@@ -45,7 +45,7 @@
 
 package org.eclipse.jgit.lib;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.FileNotFoundException;
 import java.io.IOException;
@@ -83,7 +83,7 @@
 		super(base);
 		final String decoded;
 		if (isUtf8(blob)) {
-			decoded = RawParseUtils.decode(CHARSET, blob, 3, blob.length);
+			decoded = RawParseUtils.decode(UTF_8, blob, 3, blob.length);
 		} else {
 			decoded = RawParseUtils.decode(blob);
 		}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/CommitBuilder.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/CommitBuilder.java
index 59a13f6..c30833d 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/CommitBuilder.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/CommitBuilder.java
@@ -45,6 +45,8 @@
 
 package org.eclipse.jgit.lib;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.OutputStreamWriter;
@@ -93,7 +95,7 @@
 	 */
 	public CommitBuilder() {
 		parentIds = EMPTY_OBJECTID_LIST;
-		encoding = Constants.CHARSET;
+		encoding = UTF_8;
 	}
 
 	/**
@@ -314,7 +316,7 @@
 			w.flush();
 			os.write('\n');
 
-			if (getEncoding() != Constants.CHARSET) {
+			if (getEncoding() != UTF_8) {
 				os.write(hencoding);
 				os.write(' ');
 				os.write(Constants.encodeASCII(getEncoding().name()));
@@ -375,7 +377,7 @@
 		r.append(committer != null ? committer.toString() : "NOT_SET");
 		r.append("\n");
 
-		if (encoding != null && encoding != Constants.CHARSET) {
+		if (encoding != null && encoding != UTF_8) {
 			r.append("encoding ");
 			r.append(encoding.name());
 			r.append("\n");
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/Config.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/Config.java
index 0e01cca..b666f21 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/Config.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/Config.java
@@ -51,7 +51,7 @@
 
 package org.eclipse.jgit.lib;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.text.MessageFormat;
 import java.util.ArrayList;
@@ -1168,7 +1168,7 @@
 
 		String decoded;
 		if (isUtf8(bytes)) {
-			decoded = RawParseUtils.decode(CHARSET, bytes, 3, bytes.length);
+			decoded = RawParseUtils.decode(UTF_8, bytes, 3, bytes.length);
 		} else {
 			decoded = RawParseUtils.decode(bytes);
 		}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/ConfigConstants.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/ConfigConstants.java
index 5a79035..d4a0280 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/ConfigConstants.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/ConfigConstants.java
@@ -49,7 +49,7 @@
  * configuration keys
  */
 @SuppressWarnings("nls")
-public class ConfigConstants {
+public final class ConfigConstants {
 	/** The "core" section */
 	public static final String CONFIG_CORE_SECTION = "core";
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/Constants.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/Constants.java
index 9023bd8..ed00554 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/Constants.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/Constants.java
@@ -227,7 +227,13 @@
 	 */
 	public static final byte[] PACK_SIGNATURE = { 'P', 'A', 'C', 'K' };
 
-	/** Native character encoding for commit messages, file names... */
+	/**
+	 * Native character encoding for commit messages, file names...
+	 *
+	 * @deprecated Use {@link java.nio.charset.StandardCharsets#UTF_8} directly
+	 *             instead.
+	 **/
+	@Deprecated
 	public static final Charset CHARSET;
 
 	/** Native character encoding for commit messages, file names... */
@@ -638,7 +644,7 @@
 	 * @see #CHARACTER_ENCODING
 	 */
 	public static byte[] encode(String str) {
-		final ByteBuffer bb = Constants.CHARSET.encode(str);
+		final ByteBuffer bb = UTF_8.encode(str);
 		final int len = bb.limit();
 		if (bb.hasArray() && bb.arrayOffset() == 0) {
 			final byte[] arr = bb.array();
@@ -655,7 +661,7 @@
 		if (OBJECT_ID_LENGTH != newMessageDigest().getDigestLength())
 			throw new LinkageError(JGitText.get().incorrectOBJECT_ID_LENGTH);
 		CHARSET = UTF_8;
-		CHARACTER_ENCODING = CHARSET.name();
+		CHARACTER_ENCODING = UTF_8.name();
 	}
 
 	/** name of the file containing the commit msg for a merge commit */
@@ -687,11 +693,23 @@
 	 */
 	public static final String COMMIT_EDITMSG = "COMMIT_EDITMSG";
 
-	/** objectid for the empty blob */
+	/**
+	 * Well-known object ID for the empty blob.
+	 *
+	 * @since 0.9.1
+	 */
 	public static final ObjectId EMPTY_BLOB_ID = ObjectId
 			.fromString("e69de29bb2d1d6434b8b29ae775ad8c2e48c5391");
 
 	/**
+	 * Well-known object ID for the empty tree.
+	 *
+	 * @since 5.1
+	 */
+	public static final ObjectId EMPTY_TREE_ID = ObjectId
+			.fromString("4b825dc642cb6eb9a060e54bf8d69288fbee4904");
+
+	/**
 	 * Suffix of lock file name
 	 *
 	 * @since 4.7
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/RebaseTodoFile.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/RebaseTodoFile.java
index 3871605..06b4b22 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/RebaseTodoFile.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/RebaseTodoFile.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.lib;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.BufferedOutputStream;
 import java.io.File;
@@ -183,7 +183,7 @@
 			switch (tokenCount) {
 			case 0:
 				String actionToken = new String(buf, tokenBegin,
-						nextSpace - tokenBegin - 1, CHARSET);
+						nextSpace - tokenBegin - 1, UTF_8);
 				tokenBegin = nextSpace;
 				action = RebaseTodoLine.Action.parse(actionToken);
 				if (action == null)
@@ -192,7 +192,7 @@
 			case 1:
 				nextSpace = RawParseUtils.next(buf, tokenBegin, ' ');
 				String commitToken = new String(buf, tokenBegin,
-						nextSpace - tokenBegin - 1, CHARSET);
+						nextSpace - tokenBegin - 1, UTF_8);
 				tokenBegin = nextSpace;
 				commit = AbbreviatedObjectId.fromString(commitToken);
 				break;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/Repository.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/Repository.java
index 29cc19c..d73c05e 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/Repository.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/Repository.java
@@ -1094,7 +1094,9 @@
 	 * not point to any object yet.
 	 *
 	 * @return mutable map of all known refs (heads, tags, remotes).
+	 * @deprecated use {@code getRefDatabase().getRefs()} instead.
 	 */
+	@Deprecated
 	@NonNull
 	public Map<String, Ref> getAllRefs() {
 		try {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/TagBuilder.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/TagBuilder.java
index bd03165..7669e95 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/TagBuilder.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/TagBuilder.java
@@ -45,6 +45,8 @@
 
 package org.eclipse.jgit.lib;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.OutputStreamWriter;
@@ -181,7 +183,7 @@
 	public byte[] build() {
 		ByteArrayOutputStream os = new ByteArrayOutputStream();
 		try (OutputStreamWriter w = new OutputStreamWriter(os,
-				Constants.CHARSET)) {
+				UTF_8)) {
 			w.write("object "); //$NON-NLS-1$
 			getObjectId().copyTo(w);
 			w.write('\n');
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/TextProgressMonitor.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/TextProgressMonitor.java
index 2f759e5..936ce3d 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/TextProgressMonitor.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/TextProgressMonitor.java
@@ -44,7 +44,7 @@
 
 package org.eclipse.jgit.lib;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.IOException;
 import java.io.OutputStreamWriter;
@@ -63,7 +63,7 @@
 	 * Initialize a new progress monitor.
 	 */
 	public TextProgressMonitor() {
-		this(new PrintWriter(new OutputStreamWriter(System.err, CHARSET)));
+		this(new PrintWriter(new OutputStreamWriter(System.err, UTF_8)));
 	}
 
 	/**
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/merge/ResolveMerger.java b/org.eclipse.jgit/src/org/eclipse/jgit/merge/ResolveMerger.java
index da6a3da..f60c95f 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/merge/ResolveMerger.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/merge/ResolveMerger.java
@@ -78,6 +78,7 @@
 import org.eclipse.jgit.dircache.DirCacheBuildIterator;
 import org.eclipse.jgit.dircache.DirCacheBuilder;
 import org.eclipse.jgit.dircache.DirCacheCheckout;
+import org.eclipse.jgit.dircache.DirCacheCheckout.CheckoutMetadata;
 import org.eclipse.jgit.dircache.DirCacheEntry;
 import org.eclipse.jgit.errors.BinaryBlobException;
 import org.eclipse.jgit.errors.CorruptObjectException;
@@ -297,6 +298,12 @@
 	 */
 	private int inCoreLimit;
 
+	/**
+	 * Keeps {@link CheckoutMetadata} for {@link #checkout()} and
+	 * {@link #cleanUp()}.
+	 */
+	private Map<String, CheckoutMetadata> checkoutMetadata;
+
 	private static MergeAlgorithm getMergeAlgorithm(Config config) {
 		SupportedAlgorithm diffAlg = config.getEnum(
 				CONFIG_DIFF_SECTION, null, CONFIG_KEY_ALGORITHM,
@@ -313,6 +320,8 @@
 		return new String[] { "BASE", "OURS", "THEIRS" }; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
 	}
 
+	private static final Attributes NO_ATTRIBUTES = new Attributes();
+
 	/**
 	 * Constructor for ResolveMerger.
 	 *
@@ -369,15 +378,20 @@
 	/** {@inheritDoc} */
 	@Override
 	protected boolean mergeImpl() throws IOException {
-		if (implicitDirCache)
+		if (implicitDirCache) {
 			dircache = nonNullRepo().lockDirCache();
-
+		}
+		if (!inCore) {
+			checkoutMetadata = new HashMap<>();
+		}
 		try {
 			return mergeTrees(mergeBase(), sourceTrees[0], sourceTrees[1],
 					false);
 		} finally {
-			if (implicitDirCache)
+			checkoutMetadata = null;
+			if (implicitDirCache) {
 				dircache.unlock();
+			}
 		}
 	}
 
@@ -400,7 +414,8 @@
 			if (cacheEntry.getFileMode() == FileMode.GITLINK) {
 				new File(nonNullRepo().getWorkTree(), entry.getKey()).mkdirs();
 			} else {
-				DirCacheCheckout.checkoutEntry(db, cacheEntry, reader);
+				DirCacheCheckout.checkoutEntry(db, cacheEntry, reader, false,
+						checkoutMetadata.get(entry.getKey()));
 				modifiedFiles.add(entry.getKey());
 			}
 		}
@@ -428,10 +443,12 @@
 		DirCache dc = nonNullRepo().readDirCache();
 		Iterator<String> mpathsIt=modifiedFiles.iterator();
 		while(mpathsIt.hasNext()) {
-			String mpath=mpathsIt.next();
+			String mpath = mpathsIt.next();
 			DirCacheEntry entry = dc.getEntry(mpath);
-			if (entry != null)
-				DirCacheCheckout.checkoutEntry(db, entry, reader);
+			if (entry != null) {
+				DirCacheCheckout.checkoutEntry(db, entry, reader, false,
+						checkoutMetadata.get(mpath));
+			}
 			mpathsIt.remove();
 		}
 	}
@@ -481,6 +498,71 @@
 	}
 
 	/**
+	 * Remembers the {@link CheckoutMetadata} for the given path; it may be
+	 * needed in {@link #checkout()} or in {@link #cleanUp()}.
+	 *
+	 * @param path
+	 *            of the current node
+	 * @param attributes
+	 *            for the current node
+	 * @throws IOException
+	 *             if the smudge filter cannot be determined
+	 * @since 5.1
+	 */
+	protected void addCheckoutMetadata(String path, Attributes attributes)
+			throws IOException {
+		if (checkoutMetadata != null) {
+			EolStreamType eol = EolStreamTypeUtil.detectStreamType(
+					OperationType.CHECKOUT_OP, workingTreeOptions, attributes);
+			CheckoutMetadata data = new CheckoutMetadata(eol,
+					tw.getFilterCommand(Constants.ATTR_FILTER_TYPE_SMUDGE));
+			checkoutMetadata.put(path, data);
+		}
+	}
+
+	/**
+	 * Adds a {@link DirCacheEntry} for direct checkout and remembers its
+	 * {@link CheckoutMetadata}.
+	 *
+	 * @param path
+	 *            of the entry
+	 * @param entry
+	 *            to add
+	 * @param attributes
+	 *            for the current entry
+	 * @throws IOException
+	 *             if the {@link CheckoutMetadata} cannot be determined
+	 * @since 5.1
+	 */
+	protected void addToCheckout(String path, DirCacheEntry entry,
+			Attributes attributes) throws IOException {
+		toBeCheckedOut.put(path, entry);
+		addCheckoutMetadata(path, attributes);
+	}
+
+	/**
+	 * Remember a path for deletion, and remember its {@link CheckoutMetadata}
+	 * in case it has to be restored in {@link #cleanUp()}.
+	 *
+	 * @param path
+	 *            of the entry
+	 * @param isFile
+	 *            whether it is a file
+	 * @param attributes
+	 *            for the entry
+	 * @throws IOException
+	 *             if the {@link CheckoutMetadata} cannot be determined
+	 * @since 5.1
+	 */
+	protected void addDeletion(String path, boolean isFile,
+			Attributes attributes) throws IOException {
+		toBeDeleted.add(path);
+		if (isFile) {
+			addCheckoutMetadata(path, attributes);
+		}
+	}
+
+	/**
 	 * Processes one path and tries to merge taking git attributes in account.
 	 * This method will do all trivial (not content) merges and will also detect
 	 * if a merge will fail. The merge will fail when one of the following is
@@ -586,7 +668,7 @@
 						// This will happen later. Set these values to 0 for know.
 						DirCacheEntry e = add(tw.getRawPath(), theirs,
 								DirCacheEntry.STAGE_0, 0, 0);
-						toBeCheckedOut.put(tw.getPathString(), e);
+						addToCheckout(tw.getPathString(), e, attributes);
 					}
 					return true;
 				} else {
@@ -627,18 +709,23 @@
 				// This will happen later. Set these values to 0 for know.
 				DirCacheEntry e = add(tw.getRawPath(), theirs,
 						DirCacheEntry.STAGE_0, 0, 0);
-				if (e != null)
-					toBeCheckedOut.put(tw.getPathString(), e);
+				if (e != null) {
+					addToCheckout(tw.getPathString(), e, attributes);
+				}
 				return true;
 			} else {
 				// we want THEIRS ... but THEIRS contains a folder or the
-				// deletion of the path. Delete what's in the workingtree (the
-				// workingtree is clean) but do not complain if the file is
-				// already deleted locally. This complements the test in
-				// isWorktreeDirty() for the same case.
-				if (tw.getTreeCount() > T_FILE && tw.getRawMode(T_FILE) == 0)
+				// deletion of the path. Delete what's in the working tree,
+				// which we know to be clean.
+				if (tw.getTreeCount() > T_FILE && tw.getRawMode(T_FILE) == 0) {
+					// Not present in working tree, so nothing to delete
 					return true;
-				toBeDeleted.add(tw.getPathString());
+				}
+				if (modeT != 0 && modeT == modeB) {
+					// Base, ours, and theirs all contain a folder: don't delete
+					return true;
+				}
+				addDeletion(tw.getPathString(), nonTree(modeO), attributes);
 				return true;
 			}
 		}
@@ -722,9 +809,12 @@
 				result.setContainsConflicts(false);
 			}
 			updateIndex(base, ours, theirs, result, attributes);
-			if (result.containsConflicts() && !ignoreConflicts)
-				unmergedPaths.add(tw.getPathString());
-			modifiedFiles.add(tw.getPathString());
+			String currentPath = tw.getPathString();
+			if (result.containsConflicts() && !ignoreConflicts) {
+				unmergedPaths.add(currentPath);
+			}
+			modifiedFiles.add(currentPath);
+			addCheckoutMetadata(currentPath, attributes);
 		} else if (modeO != modeT) {
 			// OURS or THEIRS has been deleted
 			if (((modeO != 0 && !tw.idEqual(T_BASE, T_OURS)) || (modeT != 0 && !tw
@@ -743,8 +833,9 @@
 					if (isWorktreeDirty(work, ourDce))
 						return false;
 					if (nonTree(modeT)) {
-						if (e != null)
-							toBeCheckedOut.put(tw.getPathString(), e);
+						if (e != null) {
+							addToCheckout(tw.getPathString(), e, attributes);
+						}
 					}
 				}
 
@@ -1245,7 +1336,8 @@
 					hasWorkingTreeIterator ? treeWalk.getTree(T_FILE,
 							WorkingTreeIterator.class) : null,
 					ignoreConflicts, hasAttributeNodeProvider
-							? treeWalk.getAttributes() : new Attributes())) {
+							? treeWalk.getAttributes()
+							: NO_ATTRIBUTES)) {
 				cleanUp();
 				return false;
 			}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/patch/FileHeader.java b/org.eclipse.jgit/src/org/eclipse/jgit/patch/FileHeader.java
index d0a5216..1f4beb0 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/patch/FileHeader.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/patch/FileHeader.java
@@ -43,6 +43,7 @@
 
 package org.eclipse.jgit.patch;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.lib.Constants.encodeASCII;
 import static org.eclipse.jgit.util.RawParseUtils.decode;
 import static org.eclipse.jgit.util.RawParseUtils.decodeNoFallback;
@@ -63,7 +64,6 @@
 import org.eclipse.jgit.diff.EditList;
 import org.eclipse.jgit.internal.JGitText;
 import org.eclipse.jgit.lib.AbbreviatedObjectId;
-import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.FileMode;
 import org.eclipse.jgit.util.QuotedString;
 import org.eclipse.jgit.util.RawParseUtils;
@@ -198,7 +198,7 @@
 	 * Convert the patch script for this file into a string.
 	 * <p>
 	 * The default character encoding
-	 * ({@link org.eclipse.jgit.lib.Constants#CHARSET}) is assumed for both the
+	 * ({@link java.nio.charset.StandardCharsets#UTF_8}) is assumed for both the
 	 * old and new files.
 	 *
 	 * @return the patch script, as a Unicode string.
@@ -240,8 +240,9 @@
 
 		if (trySimpleConversion(charsetGuess)) {
 			Charset cs = charsetGuess != null ? charsetGuess[0] : null;
-			if (cs == null)
-				cs = Constants.CHARSET;
+			if (cs == null) {
+				cs = UTF_8;
+			}
 			try {
 				return decodeNoFallback(cs, buf, startOffset, endOffset);
 			} catch (CharacterCodingException cee) {
@@ -290,8 +291,9 @@
 			final String[] r = new String[tmp.length];
 			for (int i = 0; i < tmp.length; i++) {
 				Charset cs = csGuess != null ? csGuess[i] : null;
-				if (cs == null)
-					cs = Constants.CHARSET;
+				if (cs == null) {
+					cs = UTF_8;
+				}
 				r[i] = RawParseUtils.decode(cs, tmp[i].toByteArray());
 			}
 			return r;
@@ -429,7 +431,7 @@
 					oldPath = QuotedString.GIT_PATH.dequote(buf, bol, sp - 1);
 					oldPath = p1(oldPath);
 				} else {
-					oldPath = decode(Constants.CHARSET, buf, aStart, sp - 1);
+					oldPath = decode(UTF_8, buf, aStart, sp - 1);
 				}
 				newPath = oldPath;
 				return eol;
@@ -572,7 +574,7 @@
 				tab--;
 			if (ptr == tab)
 				tab = end;
-			r = decode(Constants.CHARSET, buf, ptr, tab - 1);
+			r = decode(UTF_8, buf, ptr, tab - 1);
 		}
 
 		if (r.equals(DEV_NULL))
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/patch/FormatError.java b/org.eclipse.jgit/src/org/eclipse/jgit/patch/FormatError.java
index 1dd24d7..10ea778 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/patch/FormatError.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/patch/FormatError.java
@@ -43,9 +43,10 @@
 
 package org.eclipse.jgit.patch;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.util.Locale;
 
-import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.util.RawParseUtils;
 
 /**
@@ -120,7 +121,7 @@
 	 */
 	public String getLineText() {
 		final int eol = RawParseUtils.nextLF(buf, offset);
-		return RawParseUtils.decode(Constants.CHARSET, buf, offset, eol);
+		return RawParseUtils.decode(UTF_8, buf, offset, eol);
 	}
 
 	/** {@inheritDoc} */
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/revplot/PlotWalk.java b/org.eclipse.jgit/src/org/eclipse/jgit/revplot/PlotWalk.java
index f27f356..ee18fe7 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/revplot/PlotWalk.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/revplot/PlotWalk.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008-2009, Robin Rosenberg <robin.rosenberg@dewire.com>
+ * Copyright (C) 2008-2018, Robin Rosenberg <robin.rosenberg@dewire.com>
  * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
  * and other copyright owners as documented in the project's IP log.
  *
@@ -53,6 +53,7 @@
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Comparator;
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
@@ -75,13 +76,25 @@
  */
 public class PlotWalk extends RevWalk {
 
+	private Map<AnyObjectId, Set<Ref>> additionalRefMap;
+
 	private Map<AnyObjectId, Set<Ref>> reverseRefMap;
 
+	private Repository repository;
+
 	/** {@inheritDoc} */
 	@Override
 	public void dispose() {
 		super.dispose();
-		reverseRefMap.clear();
+		if (reverseRefMap != null) {
+			reverseRefMap.clear();
+			reverseRefMap = null;
+		}
+		if (additionalRefMap != null) {
+			additionalRefMap.clear();
+			additionalRefMap = null;
+		}
+		repository = null;
 	}
 
 	/**
@@ -93,7 +106,8 @@
 	public PlotWalk(Repository repo) {
 		super(repo);
 		super.sort(RevSort.TOPO, true);
-		reverseRefMap = repo.getAllRefsByPeeledObjectId();
+		additionalRefMap = new HashMap<>();
+		repository = repo;
 	}
 
 	/**
@@ -105,14 +119,14 @@
 	 */
 	public void addAdditionalRefs(Iterable<Ref> refs) throws IOException {
 		for (Ref ref : refs) {
-			Set<Ref> set = reverseRefMap.get(ref.getObjectId());
+			Set<Ref> set = additionalRefMap.get(ref.getObjectId());
 			if (set == null)
 				set = Collections.singleton(ref);
 			else {
 				set = new HashSet<>(set);
 				set.add(ref);
 			}
-			reverseRefMap.put(ref.getObjectId(), set);
+			additionalRefMap.put(ref.getObjectId(), set);
 		}
 	}
 
@@ -141,11 +155,29 @@
 	}
 
 	private Ref[] getRefs(AnyObjectId commitId) {
+		if (reverseRefMap == null) {
+			reverseRefMap = repository.getAllRefsByPeeledObjectId();
+			for (Map.Entry<AnyObjectId, Set<Ref>> entry : additionalRefMap
+					.entrySet()) {
+				Set<Ref> set = reverseRefMap.get(entry.getKey());
+				Set<Ref> additional = entry.getValue();
+				if (set != null) {
+					if (additional.size() == 1) {
+						// It's an unmodifiable singleton set...
+						additional = new HashSet<>(additional);
+					}
+					additional.addAll(set);
+				}
+				reverseRefMap.put(entry.getKey(), additional);
+			}
+			additionalRefMap.clear();
+			additionalRefMap = null;
+		}
 		Collection<Ref> list = reverseRefMap.get(commitId);
-		if (list == null)
+		if (list == null) {
 			return PlotCommit.NO_REFS;
-		else {
-			Ref[] tags = list.toArray(new Ref[list.size()]);
+		} else {
+			Ref[] tags = list.toArray(new Ref[0]);
 			Arrays.sort(tags, new PlotRefComparator());
 			return tags;
 		}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/RevCommit.java b/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/RevCommit.java
index b67f934..86ecd8e 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/RevCommit.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/RevCommit.java
@@ -44,13 +44,14 @@
 
 package org.eclipse.jgit.revwalk;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.IOException;
 import java.nio.charset.Charset;
 import java.nio.charset.IllegalCharsetNameException;
 import java.nio.charset.UnsupportedCharsetException;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 
@@ -168,10 +169,10 @@
 		}
 	}
 
-	void parseCanonical(RevWalk walk, byte[] raw)
-			throws IOException {
-		if (!walk.shallowCommitsInitialized)
-			walk.initializeShallowCommits();
+	void parseCanonical(RevWalk walk, byte[] raw) throws IOException {
+		if (!walk.shallowCommitsInitialized) {
+			walk.initializeShallowCommits(this);
+		}
 
 		final MutableObjectId idBuffer = walk.idBuffer;
 		idBuffer.fromString(raw, 5);
@@ -182,13 +183,14 @@
 			RevCommit[] pList = new RevCommit[1];
 			int nParents = 0;
 			for (;;) {
-				if (raw[ptr] != 'p')
+				if (raw[ptr] != 'p') {
 					break;
+				}
 				idBuffer.fromString(raw, ptr + 7);
 				final RevCommit p = walk.lookupCommit(idBuffer);
-				if (nParents == 0)
+				if (nParents == 0) {
 					pList[nParents++] = p;
-				else if (nParents == 1) {
+				} else if (nParents == 1) {
 					pList = new RevCommit[] { pList[0], p };
 					nParents = 2;
 				} else {
@@ -218,8 +220,9 @@
 			commitTime = RawParseUtils.parseBase10(raw, ptr, null);
 		}
 
-		if (walk.isRetainBody())
+		if (walk.isRetainBody()) {
 			buffer = raw;
+		}
 		flags |= PARSED;
 	}
 
@@ -388,6 +391,34 @@
 	}
 
 	/**
+	 * Parse the gpg signature from the raw buffer.
+	 * <p>
+	 * This method parses and returns the raw content of the gpgsig lines. This
+	 * method is fairly expensive and produces a new byte[] instance on each
+	 * invocation. Callers should invoke this method only if they are certain
+	 * they will need, and should cache the return value for as long as
+	 * necessary to use all information from it.
+	 * <p>
+	 * RevFilter implementations should try to use
+	 * {@link org.eclipse.jgit.util.RawParseUtils} to scan the
+	 * {@link #getRawBuffer()} instead, as this will allow faster evaluation of
+	 * commits.
+	 *
+	 * @return contents of the gpg signature; null if the commit was not signed.
+	 * @since 5.1
+	 */
+	public final @Nullable byte[] getRawGpgSignature() {
+		final byte[] raw = buffer;
+		final byte[] header = {'g', 'p', 'g', 's', 'i', 'g'};
+		final int start = RawParseUtils.headerStart(header, raw, 0);
+		if (start < 0) {
+			return null;
+		}
+		final int end = RawParseUtils.headerEnd(raw, start);
+		return Arrays.copyOfRange(raw, start, end);
+	}
+
+	/**
 	 * Parse the author identity from the raw buffer.
 	 * <p>
 	 * This method parses and returns the content of the author line, after
@@ -539,7 +570,7 @@
 		try {
 			return getEncoding();
 		} catch (IllegalCharsetNameException | UnsupportedCharsetException e) {
-			return CHARSET;
+			return UTF_8;
 		}
 	}
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/RevTag.java b/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/RevTag.java
index 0050bac..32e7adf 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/RevTag.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/RevTag.java
@@ -45,7 +45,7 @@
 
 package org.eclipse.jgit.revwalk;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.IOException;
 import java.nio.charset.Charset;
@@ -169,7 +169,7 @@
 
 		int p = pos.value += 4; // "tag "
 		final int nameEnd = RawParseUtils.nextLF(rawTag, p) - 1;
-		tagName = RawParseUtils.decode(CHARSET, rawTag, p, nameEnd);
+		tagName = RawParseUtils.decode(UTF_8, rawTag, p, nameEnd);
 
 		if (walk.isRetainBody())
 			buffer = rawTag;
@@ -257,7 +257,7 @@
 		try {
 			return RawParseUtils.parseEncoding(buffer);
 		} catch (IllegalCharsetNameException | UnsupportedCharsetException e) {
-			return CHARSET;
+			return UTF_8;
 		}
 	}
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/RevWalk.java b/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/RevWalk.java
index a986cfd..4d555d2 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/RevWalk.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/RevWalk.java
@@ -1460,17 +1460,44 @@
 			lookupCommit(id).parents = RevCommit.NO_PARENTS;
 	}
 
-	void initializeShallowCommits() throws IOException {
-		if (shallowCommitsInitialized)
+	/**
+	 * Reads the "shallow" file and applies it by setting the parents of shallow
+	 * commits to an empty array.
+	 * <p>
+	 * There is a sequencing problem if the first commit being parsed is a
+	 * shallow commit, since {@link RevCommit#parseCanonical(RevWalk, byte[])}
+	 * calls this method before its callers add the new commit to the
+	 * {@link RevWalk#objects} map. That means a call from this method to
+	 * {@link #lookupCommit(AnyObjectId)} fails to find that commit and creates
+	 * a new one, which is promptly discarded.
+	 * <p>
+	 * To avoid that, {@link RevCommit#parseCanonical(RevWalk, byte[])} passes
+	 * its commit to this method, so that this method can apply the shallow
+	 * state to it directly and avoid creating the duplicate commit object.
+	 *
+	 * @param rc
+	 *            the initial commit being parsed
+	 * @throws IOException
+	 *             if the shallow commits file can't be read
+	 */
+	void initializeShallowCommits(RevCommit rc) throws IOException {
+		if (shallowCommitsInitialized) {
 			throw new IllegalStateException(
 					JGitText.get().shallowCommitsAlreadyInitialized);
+		}
 
 		shallowCommitsInitialized = true;
 
-		if (reader == null)
+		if (reader == null) {
 			return;
+		}
 
-		for (ObjectId id : reader.getShallowCommits())
-			lookupCommit(id).parents = RevCommit.NO_PARENTS;
+		for (ObjectId id : reader.getShallowCommits()) {
+			if (id.equals(rc.getId())) {
+				rc.parents = RevCommit.NO_PARENTS;
+			} else {
+				lookupCommit(id).parents = RevCommit.NO_PARENTS;
+			}
+		}
 	}
 }
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/storage/file/FileBasedConfig.java b/org.eclipse.jgit/src/org/eclipse/jgit/storage/file/FileBasedConfig.java
index 4b272ba..93b3baa 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/storage/file/FileBasedConfig.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/storage/file/FileBasedConfig.java
@@ -49,7 +49,7 @@
 
 package org.eclipse.jgit.storage.file;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.ByteArrayOutputStream;
 import java.io.File;
@@ -166,7 +166,7 @@
 				} else {
 					final String decoded;
 					if (isUtf8(in)) {
-						decoded = RawParseUtils.decode(CHARSET,
+						decoded = RawParseUtils.decode(UTF_8,
 								in, 3, in.length);
 						utf8Bom = true;
 					} else {
@@ -224,7 +224,7 @@
 			bos.write(0xEF);
 			bos.write(0xBB);
 			bos.write(0xBF);
-			bos.write(text.getBytes(CHARSET));
+			bos.write(text.getBytes(UTF_8));
 			out = bos.toByteArray();
 		} else {
 			out = Constants.encode(text);
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/AmazonS3.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/AmazonS3.java
index a0fc57c..f6ec4b9 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/AmazonS3.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/AmazonS3.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.transport;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.ByteArrayOutputStream;
 import java.io.File;
@@ -635,7 +635,7 @@
 		try {
 			final Mac m = Mac.getInstance(HMAC);
 			m.init(privateKey);
-			sec = Base64.encodeBytes(m.doFinal(s.toString().getBytes(CHARSET)));
+			sec = Base64.encodeBytes(m.doFinal(s.toString().getBytes(UTF_8)));
 		} catch (NoSuchAlgorithmException e) {
 			throw new IOException(MessageFormat.format(JGitText.get().noHMACsupport, HMAC, e.getMessage()));
 		} catch (InvalidKeyException e) {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/BasePackFetchConnection.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/BasePackFetchConnection.java
index 0dfcd87..ed7465c 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/BasePackFetchConnection.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/BasePackFetchConnection.java
@@ -52,7 +52,6 @@
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Date;
-import java.util.HashSet;
 import java.util.Set;
 
 import org.eclipse.jgit.errors.PackProtocolException;
@@ -235,12 +234,12 @@
 
 	private boolean noProgress;
 
-	private Set<AnyObjectId> minimalNegotiationSet;
-
 	private String lockMessage;
 
 	private PackLock packLock;
 
+	private int maxHaves;
+
 	/** RPC state, if {@link BasePackConnection#statelessRPC} is true. */
 	private TemporaryBuffer.Heap state;
 
@@ -261,12 +260,12 @@
 		if (local != null) {
 			final FetchConfig cfg = getFetchConfig();
 			allowOfsDelta = cfg.allowOfsDelta;
-			if (cfg.minimalNegotiation) {
-				minimalNegotiationSet = new HashSet<>();
-			}
+			maxHaves = cfg.maxHaves;
 		} else {
 			allowOfsDelta = true;
+			maxHaves = Integer.MAX_VALUE;
 		}
+
 		includeTags = transport.getTagOpt() != TagOpt.NO_TAGS;
 		thinPack = transport.isFetchThin();
 		filterBlobLimit = transport.getFilterBlobLimit();
@@ -294,17 +293,16 @@
 	static class FetchConfig {
 		final boolean allowOfsDelta;
 
-		final boolean minimalNegotiation;
+		final int maxHaves;
 
 		FetchConfig(Config c) {
 			allowOfsDelta = c.getBoolean("repack", "usedeltabaseoffset", true); //$NON-NLS-1$ //$NON-NLS-2$
-			minimalNegotiation = c.getBoolean("fetch", "useminimalnegotiation", //$NON-NLS-1$ //$NON-NLS-2$
-					false);
+			maxHaves = c.getInt("fetch", "maxhaves", Integer.MAX_VALUE); //$NON-NLS-1$ //$NON-NLS-2$
 		}
 
-		FetchConfig(boolean allowOfsDelta, boolean minimalNegotiation) {
+		FetchConfig(boolean allowOfsDelta, int maxHaves) {
 			this.allowOfsDelta = allowOfsDelta;
-			this.minimalNegotiation = minimalNegotiation;
+			this.maxHaves = maxHaves;
 		}
 	}
 
@@ -518,15 +516,6 @@
 			}
 			line.append('\n');
 			p.writeString(line.toString());
-			if (minimalNegotiationSet != null) {
-				Ref current = local.exactRef(r.getName());
-				if (current != null) {
-					ObjectId o = current.getObjectId();
-					if (o != null && !o.equals(ObjectId.zeroId())) {
-						minimalNegotiationSet.add(o);
-					}
-				}
-			}
 		}
 		if (first) {
 			return false;
@@ -610,9 +599,6 @@
 			pckOut.writeString("have " + o.name() + "\n"); //$NON-NLS-1$ //$NON-NLS-2$
 			havesSent++;
 			havesSinceLastContinue++;
-			if (minimalNegotiationSet != null) {
-				minimalNegotiationSet.remove(o);
-			}
 
 			if ((31 & havesSent) != 0) {
 				// We group the have lines into blocks of 32, each marked
@@ -646,16 +632,6 @@
 					// pack on the remote side. Keep doing that.
 					//
 					resultsPending--;
-					if (minimalNegotiationSet != null
-							&& minimalNegotiationSet.isEmpty()) {
-						// Minimal negotiation was requested and we sent out our
-						// current reference values for our wants, so terminate
-						// negotiation early.
-						if (statelessRPC) {
-							state.writeTo(out, null);
-						}
-						break SEND_HAVES;
-					}
 					break READ_RESULT;
 
 				case ACK:
@@ -686,14 +662,6 @@
 					if (anr == AckNackResult.ACK_READY) {
 						receivedReady = true;
 					}
-					if (minimalNegotiationSet != null && minimalNegotiationSet.isEmpty()) {
-						// Minimal negotiation was requested and we sent out our current reference
-						// values for our wants, so terminate negotiation early.
-						if (statelessRPC) {
-							state.writeTo(out, null);
-						}
-						break SEND_HAVES;
-					}
 					break;
 				}
 
@@ -709,7 +677,8 @@
 				state.writeTo(out, null);
 			}
 
-			if (receivedContinue && havesSinceLastContinue > MAX_HAVES) {
+			if (receivedContinue && havesSinceLastContinue > MAX_HAVES
+					|| havesSent >= maxHaves) {
 				// Our history must be really different from the remote's.
 				// We just sent a whole slew of have lines, and it did not
 				// recognize any of them. Avoid sending our entire history
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/BundleFetchConnection.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/BundleFetchConnection.java
index 449f529..4b20f6c 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/BundleFetchConnection.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/BundleFetchConnection.java
@@ -47,6 +47,8 @@
 
 package org.eclipse.jgit.transport;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.BufferedInputStream;
 import java.io.IOException;
 import java.io.InputStream;
@@ -66,7 +68,6 @@
 import org.eclipse.jgit.errors.TransportException;
 import org.eclipse.jgit.internal.JGitText;
 import org.eclipse.jgit.internal.storage.file.PackLock;
-import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.NullProgressMonitor;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.ObjectIdRef;
@@ -173,7 +174,7 @@
 				IO.skipFully(bin, 1);
 				done = true;
 			}
-			line.append(RawParseUtils.decode(Constants.CHARSET, hdrbuf, 0, lf));
+			line.append(RawParseUtils.decode(UTF_8, hdrbuf, 0, lf));
 		}
 		return line.toString();
 	}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/BundleWriter.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/BundleWriter.java
index f2a261b..56aaede 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/BundleWriter.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/BundleWriter.java
@@ -43,6 +43,8 @@
 
 package org.eclipse.jgit.transport;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.IOException;
 import java.io.OutputStream;
 import java.io.OutputStreamWriter;
@@ -231,7 +233,7 @@
 				packWriter.setTagTargets(tagTargets);
 			packWriter.preparePack(monitor, inc, exc);
 
-			final Writer w = new OutputStreamWriter(os, Constants.CHARSET);
+			final Writer w = new OutputStreamWriter(os, UTF_8);
 			w.write(TransportBundle.V2_BUNDLE_SIGNATURE);
 			w.write('\n');
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/CapabilitiesV2Request.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/CapabilitiesV2Request.java
new file mode 100644
index 0000000..b133ab5
--- /dev/null
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/CapabilitiesV2Request.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2018, Google LLC.
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.eclipse.jgit.transport;
+
+/**
+ * Capabilities protocol v2 request.
+ *
+ * <p>
+ * This is used as an input to {@link ProtocolV2Hook}.
+ *
+ * @since 5.1
+ */
+public final class CapabilitiesV2Request {
+	private CapabilitiesV2Request() {
+	}
+
+	/** @return A builder of {@link CapabilitiesV2Request}. */
+	public static Builder builder() {
+		return new Builder();
+	}
+
+	/** A builder for {@link CapabilitiesV2Request}. */
+	public static final class Builder {
+		private Builder() {
+		}
+
+		/** @return CapabilitiesV2Request */
+		public CapabilitiesV2Request build() {
+			return new CapabilitiesV2Request();
+		}
+	}
+}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/CredentialsProvider.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/CredentialsProvider.java
index 8115946..f7a295d 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/CredentialsProvider.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/CredentialsProvider.java
@@ -155,7 +155,7 @@
 	 */
 	public boolean get(URIish uri, List<CredentialItem> items)
 			throws UnsupportedCredentialItem {
-		return get(uri, items.toArray(new CredentialItem[items.size()]));
+		return get(uri, items.toArray(new CredentialItem[0]));
 	}
 
 	/**
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/FetchV2Request.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/FetchV2Request.java
new file mode 100644
index 0000000..853d969
--- /dev/null
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/FetchV2Request.java
@@ -0,0 +1,356 @@
+/*
+ * Copyright (C) 2018, Google LLC.
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.eclipse.jgit.transport;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.TreeMap;
+
+import org.eclipse.jgit.annotations.NonNull;
+import org.eclipse.jgit.lib.ObjectId;
+
+/**
+ * fetch protocol v2 request.
+ *
+ * <p>
+ * This is used as an input to {@link ProtocolV2Hook}.
+ *
+ * @since 5.1
+ */
+public final class FetchV2Request {
+	private final List<ObjectId> peerHas;
+
+	private final TreeMap<String, ObjectId> wantedRefs;
+
+	private final Set<ObjectId> wantsIds;
+
+	private final Set<ObjectId> clientShallowCommits;
+
+	private final int deepenSince;
+
+	private final List<String> deepenNotRefs;
+
+	private final int depth;
+
+	private final long filterBlobLimit;
+
+	private final Set<String> options;
+
+	private final boolean doneReceived;
+
+	private FetchV2Request(List<ObjectId> peerHas,
+			TreeMap<String, ObjectId> wantedRefs, Set<ObjectId> wantsIds,
+			Set<ObjectId> clientShallowCommits, int deepenSince,
+			List<String> deepenNotRefs, int depth, long filterBlobLimit,
+			boolean doneReceived, Set<String> options) {
+		this.peerHas = peerHas;
+		this.wantedRefs = wantedRefs;
+		this.wantsIds = wantsIds;
+		this.clientShallowCommits = clientShallowCommits;
+		this.deepenSince = deepenSince;
+		this.deepenNotRefs = deepenNotRefs;
+		this.depth = depth;
+		this.filterBlobLimit = filterBlobLimit;
+		this.doneReceived = doneReceived;
+		this.options = options;
+	}
+
+	/**
+	 * @return object ids in the "have" lines of the request
+	 */
+	@NonNull
+	List<ObjectId> getPeerHas() {
+		return this.peerHas;
+	}
+
+	/**
+	 * @return list of references in the "want-ref" lines of the request
+	 */
+	@NonNull
+	Map<String, ObjectId> getWantedRefs() {
+		return this.wantedRefs;
+	}
+
+	/**
+	 * @return object ids in the "want" (and "want-ref") lines of the request
+	 */
+	@NonNull
+	Set<ObjectId> getWantsIds() {
+		return wantsIds;
+	}
+
+	/**
+	 * Shallow commits the client already has.
+	 *
+	 * These are sent by the client in "shallow" request lines.
+	 *
+	 * @return set of commits the client has declared as shallow.
+	 */
+	@NonNull
+	Set<ObjectId> getClientShallowCommits() {
+		return clientShallowCommits;
+	}
+
+	/**
+	 * The value in a "deepen-since" line in the request, indicating the
+	 * timestamp where to stop fetching/cloning.
+	 *
+	 * @return timestamp in seconds since the epoch, where to stop the shallow
+	 *         fetch/clone. Defaults to 0 if not set in the request.
+	 */
+	int getDeepenSince() {
+		return deepenSince;
+	}
+
+	/**
+	 * @return the refs in "deepen-not" lines in the request.
+	 */
+	@NonNull
+	List<String> getDeepenNotRefs() {
+		return deepenNotRefs;
+	}
+
+	/**
+	 * @return the depth set in a "deepen" line. 0 by default.
+	 */
+	int getDepth() {
+		return depth;
+	}
+
+	/**
+	 * @return the blob limit set in a "filter" line (-1 if not set)
+	 */
+	long getFilterBlobLimit() {
+		return filterBlobLimit;
+	}
+
+	/**
+	 * @return true if the request had a "done" line
+	 */
+	boolean wasDoneReceived() {
+		return doneReceived;
+	}
+
+	/**
+	 * Options that tune the expected response from the server, like
+	 * "thin-pack", "no-progress" or "ofs-delta"
+	 *
+	 * These are options listed and well-defined in the git protocol
+	 * specification
+	 *
+	 * @return options found in the request lines
+	 */
+	@NonNull
+	Set<String> getOptions() {
+		return options;
+	}
+
+	/** @return A builder of {@link FetchV2Request}. */
+	static Builder builder() {
+		return new Builder();
+	}
+
+
+	/** A builder for {@link FetchV2Request}. */
+	static final class Builder {
+		List<ObjectId> peerHas = new ArrayList<>();
+
+		TreeMap<String, ObjectId> wantedRefs = new TreeMap<>();
+
+		Set<ObjectId> wantsIds = new HashSet<>();
+
+		Set<ObjectId> clientShallowCommits = new HashSet<>();
+
+		List<String> deepenNotRefs = new ArrayList<>();
+
+		Set<String> options = new HashSet<>();
+
+		int depth;
+
+		int deepenSince;
+
+		long filterBlobLimit = -1;
+
+		boolean doneReceived;
+
+		private Builder() {
+		}
+
+		/**
+		 * @param objectId
+		 *            from a "have" line in a fetch request
+		 * @return the builder
+		 */
+		Builder addPeerHas(ObjectId objectId) {
+			peerHas.add(objectId);
+			return this;
+		}
+
+		/**
+		 * From a "want-ref" line in a fetch request
+		 *
+		 * @param refName
+		 *            reference name
+		 * @param oid
+		 *            object id
+		 * @return the builder
+		 */
+		Builder addWantedRef(String refName, ObjectId oid) {
+			wantedRefs.put(refName, oid);
+			return this;
+		}
+
+		/**
+		 * @param option
+		 *            fetch request lines acting as options
+		 * @return the builder
+		 */
+		Builder addOption(String option) {
+			options.add(option);
+			return this;
+		}
+
+		/**
+		 * @param objectId
+		 *            from a "want" line in a fetch request
+		 * @return the builder
+		 */
+		Builder addWantsIds(ObjectId objectId) {
+			wantsIds.add(objectId);
+			return this;
+		}
+
+		/**
+		 * @param shallowOid
+		 *            from a "shallow" line in the fetch request
+		 * @return the builder
+		 */
+		Builder addClientShallowCommit(ObjectId shallowOid) {
+			this.clientShallowCommits.add(shallowOid);
+			return this;
+		}
+
+		/**
+		 * @param d
+		 *            from a "deepen" line in the fetch request
+		 * @return the builder
+		 */
+		Builder setDepth(int d) {
+			this.depth = d;
+			return this;
+		}
+
+		/**
+		 * @return depth set in the request (via a "deepen" line). Defaulting to
+		 *         0 if not set.
+		 */
+		int getDepth() {
+			return this.depth;
+		}
+
+		/**
+		 * @return if there has been any "deepen not" line in the request
+		 */
+		boolean hasDeepenNotRefs() {
+			return !deepenNotRefs.isEmpty();
+		}
+
+		/**
+		 * @param deepenNotRef reference in a "deepen not" line
+		 * @return the builder
+		 */
+		Builder addDeepenNotRef(String deepenNotRef) {
+			this.deepenNotRefs.add(deepenNotRef);
+			return this;
+		}
+
+		/**
+		 * @param value
+		 *            Unix timestamp received in a "deepen since" line
+		 * @return the builder
+		 */
+		Builder setDeepenSince(int value) {
+			this.deepenSince = value;
+			return this;
+		}
+
+		/**
+		 * @return shallow since value, sent before in a "deepen since" line. 0
+		 *         by default.
+		 */
+		int getDeepenSince() {
+			return this.deepenSince;
+		}
+
+		/**
+		 * @param filterBlobLimit
+		 *            set in a "filter" line
+		 * @return the builder
+		 */
+		Builder setFilterBlobLimit(long filterBlobLimit) {
+			this.filterBlobLimit = filterBlobLimit;
+			return this;
+		}
+
+		/**
+		 * Mark that the "done" line has been received.
+		 *
+		 * @return the builder
+		 */
+		Builder setDoneReceived() {
+			this.doneReceived = true;
+			return this;
+		}
+		/**
+		 * @return Initialized fetch request
+		 */
+		FetchV2Request build() {
+			return new FetchV2Request(peerHas, wantedRefs, wantsIds,
+					clientShallowCommits, deepenSince, deepenNotRefs,
+					depth, filterBlobLimit, doneReceived, options);
+		}
+	}
+}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/GitProtocolConstants.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/GitProtocolConstants.java
index 10cd775..760ac6c 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/GitProtocolConstants.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/GitProtocolConstants.java
@@ -50,7 +50,7 @@
  *
  * @since 3.2
  */
-public class GitProtocolConstants {
+public final class GitProtocolConstants {
 	/**
 	 * Include tags if we are also including the referenced objects.
 	 *
@@ -167,6 +167,13 @@
 	public static final String OPTION_FILTER = "filter"; //$NON-NLS-1$
 
 	/**
+	 * The client specified a want-ref expression.
+	 *
+	 * @since 5.1
+	 */
+	public static final String OPTION_WANT_REF = "want-ref"; //$NON-NLS-1$
+
+	/**
 	 * The client supports atomic pushes. If this option is used, the server
 	 * will update all refs within one atomic transaction.
 	 *
@@ -231,6 +238,13 @@
 	public static final String CAPABILITY_PUSH_OPTIONS = "push-options"; //$NON-NLS-1$
 
 	/**
+	 * The server supports the client specifying ref names.
+	 *
+	 * @since 5.1
+	 */
+	public static final String CAPABILITY_REF_IN_WANT = "ref-in-want"; //$NON-NLS-1$
+
+	/**
 	 * The server supports listing refs using protocol v2.
 	 *
 	 * @since 5.0
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/HMACSHA1NonceGenerator.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/HMACSHA1NonceGenerator.java
index 1415334..6c26b70 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/HMACSHA1NonceGenerator.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/HMACSHA1NonceGenerator.java
@@ -43,7 +43,7 @@
 package org.eclipse.jgit.transport;
 
 import static java.nio.charset.StandardCharsets.ISO_8859_1;
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.File;
 import java.security.InvalidKeyException;
@@ -102,7 +102,7 @@
 		}
 
 		String input = path + ":" + String.valueOf(timestamp); //$NON-NLS-1$
-		byte[] rawHmac = mac.doFinal(input.getBytes(CHARSET));
+		byte[] rawHmac = mac.doFinal(input.getBytes(UTF_8));
 		return Long.toString(timestamp) + "-" + toHex(rawHmac); //$NON-NLS-1$
 	}
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/HttpAuthMethod.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/HttpAuthMethod.java
index fb03190..69745eb 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/HttpAuthMethod.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/HttpAuthMethod.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.transport;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.util.HttpSupport.HDR_AUTHORIZATION;
 import static org.eclipse.jgit.util.HttpSupport.HDR_WWW_AUTHENTICATE;
 
@@ -315,7 +315,7 @@
 		@Override
 		void configureRequest(HttpConnection conn) throws IOException {
 			String ident = user + ":" + pass; //$NON-NLS-1$
-			String enc = Base64.encodeBytes(ident.getBytes(CHARSET));
+			String enc = Base64.encodeBytes(ident.getBytes(UTF_8));
 			conn.setRequestProperty(HDR_AUTHORIZATION, type.getSchemeName()
 					+ " " + enc); //$NON-NLS-1$
 		}
@@ -430,15 +430,15 @@
 
 		private static String H(String data) {
 			MessageDigest md = newMD5();
-			md.update(data.getBytes(CHARSET));
+			md.update(data.getBytes(UTF_8));
 			return LHEX(md.digest());
 		}
 
 		private static String KD(String secret, String data) {
 			MessageDigest md = newMD5();
-			md.update(secret.getBytes(CHARSET));
+			md.update(secret.getBytes(UTF_8));
 			md.update((byte) ':');
-			md.update(data.getBytes(CHARSET));
+			md.update(data.getBytes(UTF_8));
 			return LHEX(md.digest());
 		}
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/LsRefsV2Request.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/LsRefsV2Request.java
new file mode 100644
index 0000000..3aff584
--- /dev/null
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/LsRefsV2Request.java
@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2018, Google LLC.
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.eclipse.jgit.transport;
+
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * ls-refs protocol v2 request.
+ *
+ * <p>
+ * This is used as an input to {@link ProtocolV2Hook}.
+ *
+ * @since 5.1
+ */
+public final class LsRefsV2Request {
+	private final List<String> refPrefixes;
+
+	private final boolean symrefs;
+
+	private final boolean peel;
+
+	private LsRefsV2Request(List<String> refPrefixes, boolean symrefs,
+			boolean peel) {
+		this.refPrefixes = refPrefixes;
+		this.symrefs = symrefs;
+		this.peel = peel;
+	}
+
+	/** @return ref prefixes that the client requested. */
+	public List<String> getRefPrefixes() {
+		return refPrefixes;
+	}
+
+	/** @return true if the client requests symbolic references. */
+	public boolean getSymrefs() {
+		return symrefs;
+	}
+
+	/** @return true if the client requests tags to be peeled. */
+	public boolean getPeel() {
+		return peel;
+	}
+
+	/** @return A builder of {@link LsRefsV2Request}. */
+	public static Builder builder() {
+		return new Builder();
+	}
+
+	/** A builder for {@link LsRefsV2Request}. */
+	public static final class Builder {
+		private List<String> refPrefixes = Collections.emptyList();
+
+		private boolean symrefs;
+
+		private boolean peel;
+
+		private Builder() {
+		}
+
+		/**
+		 * @param value
+		 * @return the Builder
+		 */
+		public Builder setRefPrefixes(List<String> value) {
+			refPrefixes = value;
+			return this;
+		}
+
+		/**
+		 * @param value
+		 * @return the Builder
+		 */
+		public Builder setSymrefs(boolean value) {
+			symrefs = value;
+			return this;
+		}
+
+		/**
+		 * @param value
+		 * @return the Builder
+		 */
+		public Builder setPeel(boolean value) {
+			peel = value;
+			return this;
+		}
+
+		/** @return LsRefsV2Request */
+		public LsRefsV2Request build() {
+			return new LsRefsV2Request(
+					Collections.unmodifiableList(refPrefixes), symrefs, peel);
+		}
+	}
+}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/OpenSshConfig.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/OpenSshConfig.java
index f5ccdc8..480055c 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/OpenSshConfig.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/OpenSshConfig.java
@@ -524,7 +524,7 @@
 			if (values == null || values.isEmpty()) {
 				return new String[0];
 			}
-			return values.toArray(new String[values.size()]);
+			return values.toArray(new String[0]);
 		}
 
 		public void setValue(String key, String value) {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PacketLineIn.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PacketLineIn.java
index cc556f8..c6e19d5 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PacketLineIn.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PacketLineIn.java
@@ -45,13 +45,14 @@
 
 package org.eclipse.jgit.transport;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.IOException;
 import java.io.InputStream;
 import java.text.MessageFormat;
 
 import org.eclipse.jgit.errors.PackProtocolException;
 import org.eclipse.jgit.internal.JGitText;
-import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.MutableObjectId;
 import org.eclipse.jgit.util.IO;
 import org.eclipse.jgit.util.RawParseUtils;
@@ -186,7 +187,7 @@
 		if (raw[len - 1] == '\n')
 			len--;
 
-		String s = RawParseUtils.decode(Constants.CHARSET, raw, 0, len);
+		String s = RawParseUtils.decode(UTF_8, raw, 0, len);
 		log.debug("git< " + s); //$NON-NLS-1$
 		return s;
 	}
@@ -218,7 +219,7 @@
 
 		IO.readFully(in, raw, 0, len);
 
-		String s = RawParseUtils.decode(Constants.CHARSET, raw, 0, len);
+		String s = RawParseUtils.decode(UTF_8, raw, 0, len);
 		log.debug("git< " + s); //$NON-NLS-1$
 		return s;
 	}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PacketLineOut.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PacketLineOut.java
index a26d1d7..e940091 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PacketLineOut.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PacketLineOut.java
@@ -45,6 +45,8 @@
 
 package org.eclipse.jgit.transport;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.IOException;
 import java.io.OutputStream;
 
@@ -141,7 +143,7 @@
 		out.write(lenbuffer, 0, 4);
 		out.write(buf, pos, len);
 		if (log.isDebugEnabled()) {
-			String s = RawParseUtils.decode(Constants.CHARSET, buf, pos, len);
+			String s = RawParseUtils.decode(UTF_8, buf, pos, len);
 			log.debug("git> " + s); //$NON-NLS-1$
 		}
 	}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/ProgressSpinner.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/ProgressSpinner.java
index 2364434..41af807 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/ProgressSpinner.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/ProgressSpinner.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.transport;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.IOException;
 import java.io.OutputStream;
@@ -141,7 +141,7 @@
 	private void write(String s) {
 		if (write) {
 			try {
-				out.write(s.getBytes(CHARSET));
+				out.write(s.getBytes(UTF_8));
 				out.flush();
 			} catch (IOException e) {
 				write = false;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/ProtocolV2Hook.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/ProtocolV2Hook.java
new file mode 100644
index 0000000..d67b90b
--- /dev/null
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/ProtocolV2Hook.java
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2018, Google LLC.
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.eclipse.jgit.transport;
+
+/**
+ * Hook to allow callers to be notified on Git protocol v2 requests.
+ *
+ * @see UploadPack#setProtocolV2Hook(ProtocolV2Hook)
+ * @since 5.1
+ */
+public interface ProtocolV2Hook {
+	/**
+	 * The default hook implementation that does nothing.
+	 */
+	static ProtocolV2Hook DEFAULT = new ProtocolV2Hook() {
+		// No override.
+	};
+
+	/**
+	 * @param req
+	 *            the capabilities request
+	 * @throws ServiceMayNotContinueException
+	 *             abort; the message will be sent to the user
+	 * @since 5.1
+	 */
+	default void onCapabilities(CapabilitiesV2Request req)
+			throws ServiceMayNotContinueException {
+		// Do nothing by default.
+	}
+
+	/**
+	 * @param req
+	 *            the ls-refs request
+	 * @throws ServiceMayNotContinueException
+	 *             abort; the message will be sent to the user
+	 * @since 5.1
+	 */
+	default void onLsRefs(LsRefsV2Request req)
+			throws ServiceMayNotContinueException {
+		// Do nothing by default.
+	}
+
+	/**
+	 * @param req the fetch request
+	 * @throws ServiceMayNotContinueException abort; the message will be sent to the user
+	 */
+	default void onFetch(FetchV2Request req)
+			throws ServiceMayNotContinueException {
+		// Do nothing by default
+	}
+}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/ProtocolV2Parser.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/ProtocolV2Parser.java
new file mode 100644
index 0000000..eae2c6e
--- /dev/null
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/ProtocolV2Parser.java
@@ -0,0 +1,244 @@
+/*
+ * Copyright (C) 2018, Google LLC.
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.eclipse.jgit.transport;
+
+import static org.eclipse.jgit.transport.GitProtocolConstants.OPTION_DEEPEN_RELATIVE;
+import static org.eclipse.jgit.transport.GitProtocolConstants.OPTION_FILTER;
+import static org.eclipse.jgit.transport.GitProtocolConstants.OPTION_INCLUDE_TAG;
+import static org.eclipse.jgit.transport.GitProtocolConstants.OPTION_NO_PROGRESS;
+import static org.eclipse.jgit.transport.GitProtocolConstants.OPTION_OFS_DELTA;
+import static org.eclipse.jgit.transport.GitProtocolConstants.OPTION_SIDE_BAND_64K;
+import static org.eclipse.jgit.transport.GitProtocolConstants.OPTION_THIN_PACK;
+import static org.eclipse.jgit.transport.GitProtocolConstants.OPTION_WANT_REF;
+
+import java.io.IOException;
+import java.text.MessageFormat;
+
+import org.eclipse.jgit.errors.PackProtocolException;
+import org.eclipse.jgit.internal.JGitText;
+import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.lib.Ref;
+import org.eclipse.jgit.lib.RefDatabase;
+
+/**
+ * Parse the incoming git protocol lines from the wire and translate them into a
+ * Request object.
+ *
+ * It requires a transferConfig object to know what the server supports (e.g.
+ * ref-in-want and/or filters).
+ */
+final class ProtocolV2Parser {
+
+	private final TransferConfig transferConfig;
+
+	ProtocolV2Parser(TransferConfig transferConfig) {
+		this.transferConfig = transferConfig;
+	}
+
+	/**
+	 * Parse the incoming fetch request arguments from the wire. The caller must
+	 * be sure that what is comings is a fetch request before coming here.
+	 *
+	 * This operation requires the reference database to validate incoming
+	 * references.
+	 *
+	 * @param pckIn
+	 *            incoming lines
+	 * @param refdb
+	 *            reference database (to validate that received references exist
+	 *            and point to valid objects)
+	 * @return A FetchV2Request populated with information received from the
+	 *         wire.
+	 * @throws PackProtocolException
+	 *             incompatible options, wrong type of arguments or other issues
+	 *             where the request breaks the protocol.
+	 * @throws IOException
+	 *             an IO error prevented reading the incoming message or
+	 *             accessing the ref database.
+	 */
+	FetchV2Request parseFetchRequest(PacketLineIn pckIn, RefDatabase refdb)
+			throws PackProtocolException, IOException {
+		FetchV2Request.Builder reqBuilder = FetchV2Request.builder();
+
+		// Packs are always sent multiplexed and using full 64K
+		// lengths.
+		reqBuilder.addOption(OPTION_SIDE_BAND_64K);
+
+		String line;
+
+		// Currently, we do not support any capabilities, so the next
+		// line is DELIM.
+		if ((line = pckIn.readString()) != PacketLineIn.DELIM) {
+			throw new PackProtocolException(MessageFormat
+					.format(JGitText.get().unexpectedPacketLine, line));
+		}
+
+		boolean filterReceived = false;
+		while ((line = pckIn.readString()) != PacketLineIn.END) {
+			if (line.startsWith("want ")) { //$NON-NLS-1$
+				reqBuilder.addWantsIds(ObjectId.fromString(line.substring(5)));
+			} else if (transferConfig.isAllowRefInWant()
+					&& line.startsWith(OPTION_WANT_REF + " ")) { //$NON-NLS-1$
+				String refName = line.substring(OPTION_WANT_REF.length() + 1);
+				// TODO(ifrade): This validation should be done after the
+				// protocol parsing. It is not a protocol problem asking for an
+				// unexisting ref and we wouldn't need the ref database here
+				Ref ref = refdb.exactRef(refName);
+				if (ref == null) {
+					throw new PackProtocolException(MessageFormat
+							.format(JGitText.get().invalidRefName, refName));
+				}
+				ObjectId oid = ref.getObjectId();
+				if (oid == null) {
+					throw new PackProtocolException(MessageFormat
+							.format(JGitText.get().invalidRefName, refName));
+				}
+				reqBuilder.addWantedRef(refName, oid);
+				reqBuilder.addWantsIds(oid);
+			} else if (line.startsWith("have ")) { //$NON-NLS-1$
+				reqBuilder.addPeerHas(ObjectId.fromString(line.substring(5)));
+			} else if (line.equals("done")) { //$NON-NLS-1$
+				reqBuilder.setDoneReceived();
+			} else if (line.equals(OPTION_THIN_PACK)) {
+				reqBuilder.addOption(OPTION_THIN_PACK);
+			} else if (line.equals(OPTION_NO_PROGRESS)) {
+				reqBuilder.addOption(OPTION_NO_PROGRESS);
+			} else if (line.equals(OPTION_INCLUDE_TAG)) {
+				reqBuilder.addOption(OPTION_INCLUDE_TAG);
+			} else if (line.equals(OPTION_OFS_DELTA)) {
+				reqBuilder.addOption(OPTION_OFS_DELTA);
+			} else if (line.startsWith("shallow ")) { //$NON-NLS-1$
+				reqBuilder.addClientShallowCommit(
+						ObjectId.fromString(line.substring(8)));
+			} else if (line.startsWith("deepen ")) { //$NON-NLS-1$
+				int parsedDepth = Integer.parseInt(line.substring(7));
+				if (parsedDepth <= 0) {
+					throw new PackProtocolException(
+							MessageFormat.format(JGitText.get().invalidDepth,
+									Integer.valueOf(parsedDepth)));
+				}
+				if (reqBuilder.getDeepenSince() != 0) {
+					throw new PackProtocolException(
+							JGitText.get().deepenSinceWithDeepen);
+				}
+				if (reqBuilder.hasDeepenNotRefs()) {
+					throw new PackProtocolException(
+							JGitText.get().deepenNotWithDeepen);
+				}
+				reqBuilder.setDepth(parsedDepth);
+			} else if (line.startsWith("deepen-not ")) { //$NON-NLS-1$
+				reqBuilder.addDeepenNotRef(line.substring(11));
+				if (reqBuilder.getDepth() != 0) {
+					throw new PackProtocolException(
+							JGitText.get().deepenNotWithDeepen);
+				}
+			} else if (line.equals(OPTION_DEEPEN_RELATIVE)) {
+				reqBuilder.addOption(OPTION_DEEPEN_RELATIVE);
+			} else if (line.startsWith("deepen-since ")) { //$NON-NLS-1$
+				int ts = Integer.parseInt(line.substring(13));
+				if (ts <= 0) {
+					throw new PackProtocolException(MessageFormat
+							.format(JGitText.get().invalidTimestamp, line));
+				}
+				if (reqBuilder.getDepth() != 0) {
+					throw new PackProtocolException(
+							JGitText.get().deepenSinceWithDeepen);
+				}
+				reqBuilder.setDeepenSince(ts);
+			} else if (transferConfig.isAllowFilter()
+					&& line.startsWith(OPTION_FILTER + ' ')) {
+				if (filterReceived) {
+					throw new PackProtocolException(
+							JGitText.get().tooManyFilters);
+				}
+				filterReceived = true;
+				reqBuilder.setFilterBlobLimit(filterLine(
+						line.substring(OPTION_FILTER.length() + 1)));
+			} else {
+				throw new PackProtocolException(MessageFormat
+						.format(JGitText.get().unexpectedPacketLine, line));
+			}
+		}
+
+		return reqBuilder.build();
+	}
+
+	/**
+	 * Process the content of "filter" line from the protocol. It has a shape
+	 * like "blob:none" or "blob:limit=N", with limit a positive number.
+	 *
+	 * @param blobLine
+	 *            the content of the "filter" line in the protocol
+	 * @return N, the limit, defaulting to 0 if "none"
+	 * @throws PackProtocolException
+	 *             invalid filter because due to unrecognized format or
+	 *             negative/non-numeric filter.
+	 */
+	static long filterLine(String blobLine) throws PackProtocolException {
+		long blobLimit = -1;
+
+		if (blobLine.equals("blob:none")) { //$NON-NLS-1$
+			blobLimit = 0;
+		} else if (blobLine.startsWith("blob:limit=")) { //$NON-NLS-1$
+			try {
+				blobLimit = Long
+						.parseLong(blobLine.substring("blob:limit=".length())); //$NON-NLS-1$
+			} catch (NumberFormatException e) {
+				throw new PackProtocolException(MessageFormat
+						.format(JGitText.get().invalidFilter, blobLine));
+			}
+		}
+		/*
+		 * We must have (1) either "blob:none" or "blob:limit=" set (because we
+		 * only support blob size limits for now), and (2) if the latter, then
+		 * it must be nonnegative. Throw if (1) or (2) is not met.
+		 */
+		if (blobLimit < 0) {
+			throw new PackProtocolException(
+					MessageFormat.format(JGitText.get().invalidFilter, blobLine));
+		}
+
+		return blobLimit;
+	}
+
+}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PushCertificateIdent.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PushCertificateIdent.java
index 178c80d..f9fddbe 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PushCertificateIdent.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PushCertificateIdent.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.transport;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.util.RawParseUtils.lastIndexOfTrim;
 
 import java.text.SimpleDateFormat;
@@ -95,7 +95,7 @@
 	 */
 	public static PushCertificateIdent parse(String str) {
 		MutableInteger p = new MutableInteger();
-		byte[] raw = str.getBytes(CHARSET);
+		byte[] raw = str.getBytes(UTF_8);
 		int tzBegin = raw.length - 1;
 		tzBegin = lastIndexOfTrim(raw, ' ', tzBegin);
 		if (tzBegin < 0 || raw[tzBegin] != ' ') {
@@ -129,7 +129,7 @@
 				idEnd = raw.length;
 			}
 		}
-		String id = new String(raw, 0, idEnd, CHARSET);
+		String id = new String(raw, 0, idEnd, UTF_8);
 
 		return new PushCertificateIdent(str, id, when * 1000L, tz);
 	}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PushCertificateStore.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PushCertificateStore.java
index 7f5a340..aeca635 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PushCertificateStore.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PushCertificateStore.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.transport;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.lib.Constants.OBJ_BLOB;
 import static org.eclipse.jgit.lib.Constants.OBJ_COMMIT;
 import static org.eclipse.jgit.lib.FileMode.TYPE_FILE;
@@ -292,7 +292,8 @@
 		ObjectLoader loader =
 				tw.getObjectReader().open(tw.getObjectId(0), OBJ_BLOB);
 		try (InputStream in = loader.openStream();
-				Reader r = new BufferedReader(new InputStreamReader(in, CHARSET))) {
+				Reader r = new BufferedReader(
+						new InputStreamReader(in, UTF_8))) {
 			return PushCertificateParser.fromReader(r);
 		}
 	}
@@ -473,7 +474,7 @@
 
 		DirCacheEditor editor = dc.editor();
 		String certText = pc.cert.toText() + pc.cert.getSignature();
-		final ObjectId certId = inserter.insert(OBJ_BLOB, certText.getBytes(CHARSET));
+		final ObjectId certId = inserter.insert(OBJ_BLOB, certText.getBytes(UTF_8));
 		boolean any = false;
 		for (ReceiveCommand cmd : pc.cert.getCommands()) {
 			if (byRef != null && !commandsEqual(cmd, byRef.get(cmd.getRefName()))) {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/RefAdvertiser.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/RefAdvertiser.java
index dc1871b..4662435 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/RefAdvertiser.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/RefAdvertiser.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.transport;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.lib.Constants.OBJECT_ID_STRING_LENGTH;
 import static org.eclipse.jgit.transport.GitProtocolConstants.OPTION_SYMREF;
 
@@ -74,7 +74,7 @@
 public abstract class RefAdvertiser {
 	/** Advertiser which frames lines in a {@link PacketLineOut} format. */
 	public static class PacketLineOutRefAdvertiser extends RefAdvertiser {
-		private final CharsetEncoder utf8 = CHARSET.newEncoder();
+		private final CharsetEncoder utf8 = UTF_8.newEncoder();
 		private final PacketLineOut pckOut;
 
 		private byte[] binArr = new byte[256];
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/SideBandInputStream.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/SideBandInputStream.java
index 3100cb4..90600cb 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/SideBandInputStream.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/SideBandInputStream.java
@@ -44,6 +44,7 @@
 
 package org.eclipse.jgit.transport;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.transport.SideBandOutputStream.HDR_SIZE;
 
 import java.io.IOException;
@@ -57,7 +58,6 @@
 import org.eclipse.jgit.errors.PackProtocolException;
 import org.eclipse.jgit.errors.TransportException;
 import org.eclipse.jgit.internal.JGitText;
-import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.ProgressMonitor;
 import org.eclipse.jgit.util.IO;
 import org.eclipse.jgit.util.RawParseUtils;
@@ -257,6 +257,6 @@
 	private String readString(int len) throws IOException {
 		final byte[] raw = new byte[len];
 		IO.readFully(rawIn, raw, 0, len);
-		return RawParseUtils.decode(Constants.CHARSET, raw, 0, len);
+		return RawParseUtils.decode(UTF_8, raw, 0, len);
 	}
 }
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/TransferConfig.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/TransferConfig.java
index 4ae1ccb..6b8d5c5 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/TransferConfig.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/TransferConfig.java
@@ -126,6 +126,7 @@
 	private final boolean allowInvalidPersonIdent;
 	private final boolean safeForWindows;
 	private final boolean safeForMacOS;
+	private final boolean allowRefInWant;
 	private final boolean allowTipSha1InWant;
 	private final boolean allowReachableSha1InWant;
 	private final boolean allowFilter;
@@ -180,6 +181,7 @@
 			ignore.add(ObjectChecker.ErrorType.ZERO_PADDED_FILEMODE);
 		}
 
+		allowRefInWant = rc.getBoolean("uploadpack", "allowrefinwant", false);
 		allowTipSha1InWant = rc.getBoolean(
 				"uploadpack", "allowtipsha1inwant", false);
 		allowReachableSha1InWant = rc.getBoolean(
@@ -262,6 +264,14 @@
 	}
 
 	/**
+	 * @return true if clients are allowed to specify a "want-ref" line
+	 * @since 5.1
+	 */
+	public boolean isAllowRefInWant() {
+		return allowRefInWant;
+	}
+
+	/**
 	 * Get {@link org.eclipse.jgit.transport.RefFilter} respecting configured
 	 * hidden refs.
 	 *
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/Transport.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/Transport.java
index d342ef4..621c2ea 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/Transport.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/Transport.java
@@ -46,7 +46,7 @@
 
 package org.eclipse.jgit.transport;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.BufferedReader;
 import java.io.IOException;
@@ -144,7 +144,7 @@
 
 	private static void scan(ClassLoader ldr, URL url) {
 		try (BufferedReader br = new BufferedReader(
-				new InputStreamReader(url.openStream(), CHARSET))) {
+				new InputStreamReader(url.openStream(), UTF_8))) {
 			String line;
 			while ((line = br.readLine()) != null) {
 				line = line.trim();
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/TransportHttp.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/TransportHttp.java
index c08f400..8b41ab0 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/TransportHttp.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/TransportHttp.java
@@ -46,6 +46,7 @@
 
 package org.eclipse.jgit.transport;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.eclipse.jgit.lib.Constants.HEAD;
 import static org.eclipse.jgit.util.HttpSupport.ENCODING_GZIP;
 import static org.eclipse.jgit.util.HttpSupport.ENCODING_X_GZIP;
@@ -426,7 +427,7 @@
 	}
 
 	private BufferedReader toBufferedReader(InputStream in) {
-		return new BufferedReader(new InputStreamReader(in, Constants.CHARSET));
+		return new BufferedReader(new InputStreamReader(in, UTF_8));
 	}
 
 	/** {@inheritDoc} */
@@ -483,6 +484,18 @@
 		this.headers = headers;
 	}
 
+	private NoRemoteRepositoryException createNotFoundException(URIish u,
+			URL url, String msg) {
+		String text;
+		if (msg != null && !msg.isEmpty()) {
+			text = MessageFormat.format(JGitText.get().uriNotFoundWithMessage,
+					url, msg);
+		} else {
+			text = MessageFormat.format(JGitText.get().uriNotFound, url);
+		}
+		return new NoRemoteRepositoryException(u, text);
+	}
+
 	private HttpConnection connect(String service)
 			throws TransportException, NotSupportedException {
 		URL u = getServiceURL(service);
@@ -511,8 +524,8 @@
 					return conn;
 
 				case HttpConnection.HTTP_NOT_FOUND:
-					throw new NoRemoteRepositoryException(uri,
-							MessageFormat.format(JGitText.get().uriNotFound, u));
+					throw createNotFoundException(uri, u,
+							conn.getResponseMessage());
 
 				case HttpConnection.HTTP_UNAUTHORIZED:
 					authMethod = HttpAuthMethod.scanResponse(conn, ignoreTypes);
@@ -940,7 +953,7 @@
 			// Line oriented readable content is likely to compress well.
 			// Request gzip encoding.
 			InputStream is = open(path, AcceptEncoding.GZIP).in;
-			return new BufferedReader(new InputStreamReader(is, Constants.CHARSET));
+			return new BufferedReader(new InputStreamReader(is, UTF_8));
 		}
 
 		@Override
@@ -1180,9 +1193,8 @@
 						return;
 
 					case HttpConnection.HTTP_NOT_FOUND:
-						throw new NoRemoteRepositoryException(uri,
-								MessageFormat.format(JGitText.get().uriNotFound,
-										conn.getURL()));
+						throw createNotFoundException(uri, conn.getURL(),
+								conn.getResponseMessage());
 
 					case HttpConnection.HTTP_FORBIDDEN:
 						throw new TransportException(uri,
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/UploadPack.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/UploadPack.java
index 7de0506..cd7290e 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/UploadPack.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/UploadPack.java
@@ -45,6 +45,7 @@
 
 import static org.eclipse.jgit.lib.Constants.R_TAGS;
 import static org.eclipse.jgit.lib.RefDatabase.ALL;
+import static org.eclipse.jgit.transport.GitProtocolConstants.CAPABILITY_REF_IN_WANT;
 import static org.eclipse.jgit.transport.GitProtocolConstants.COMMAND_FETCH;
 import static org.eclipse.jgit.transport.GitProtocolConstants.COMMAND_LS_REFS;
 import static org.eclipse.jgit.transport.GitProtocolConstants.OPTION_AGENT;
@@ -264,6 +265,9 @@
 	/** The refs we advertised as existing at the start of the connection. */
 	private Map<String, Ref> refs;
 
+	/** Hook used while processing Git protocol v2 requests. */
+	private ProtocolV2Hook protocolV2Hook = ProtocolV2Hook.DEFAULT;
+
 	/** Hook used while advertising the refs to the client. */
 	private AdvertiseRefsHook advertiseRefsHook = AdvertiseRefsHook.DEFAULT;
 
@@ -290,7 +294,7 @@
 	private final Set<RevObject> commonBase = new HashSet<>();
 
 	/** Shallow commits the client already has. */
-	private final Set<ObjectId> clientShallowCommits = new HashSet<>();
+	private Set<ObjectId> clientShallowCommits = new HashSet<>();
 
 	/** Desired depth from the client on a shallow request. */
 	private int depth;
@@ -303,10 +307,10 @@
 
 	/**
 	 * (Possibly short) ref names, ancestors of which the client has asked us
-	 * not to send using --shallow-exclude. Cannot be non-null if depth is
+	 * not to send using --shallow-exclude. Cannot be non-empty if depth is
 	 * nonzero.
 	 */
-	private @Nullable List<String> shallowExcludeRefs;
+	private List<String> deepenNotRefs = new ArrayList<>();
 
 	/** Commit time of the oldest common commit, in seconds. */
 	private int oldestTime;
@@ -576,6 +580,16 @@
 	}
 
 	/**
+	 * Set the protocol V2 hook.
+	 *
+	 * @param hook
+	 * @since 5.1
+	 */
+	public void setProtocolV2Hook(ProtocolV2Hook hook) {
+		this.protocolV2Hook = hook;
+	}
+
+	/**
 	 * Set the filter used while advertising the refs to the client.
 	 * <p>
 	 * Only refs allowed by this filter will be sent to the client. The filter
@@ -817,7 +831,7 @@
 				multiAck = MultiAck.OFF;
 
 			if (!clientShallowCommits.isEmpty())
-				verifyClientShallow();
+				verifyClientShallow(clientShallowCommits);
 			if (depth != 0)
 				processShallow(null, unshallowCommits, true);
 			if (!clientShallowCommits.isEmpty())
@@ -877,25 +891,19 @@
 	}
 
 	private void lsRefsV2() throws IOException {
-		PacketLineOutRefAdvertiser adv = new PacketLineOutRefAdvertiser(pckOut);
-		String line;
-		ArrayList<String> refPrefixes = new ArrayList<>();
-		boolean needToFindSymrefs = false;
-
-		adv.setUseProtocolV2(true);
-
-		line = pckIn.readString();
-
+		LsRefsV2Request.Builder builder = LsRefsV2Request.builder();
+		List<String> prefixes = new ArrayList<>();
+		String line = pckIn.readString();
 		// Currently, we do not support any capabilities, so the next
 		// line is DELIM if there are arguments or END if not.
 		if (line == PacketLineIn.DELIM) {
 			while ((line = pckIn.readString()) != PacketLineIn.END) {
 				if (line.equals("peel")) { //$NON-NLS-1$
-					adv.setDerefTags(true);
+					builder.setPeel(true);
 				} else if (line.equals("symrefs")) { //$NON-NLS-1$
-					needToFindSymrefs = true;
+					builder.setSymrefs(true);
 				} else if (line.startsWith("ref-prefix ")) { //$NON-NLS-1$
-					refPrefixes.add(line.substring("ref-prefix ".length())); //$NON-NLS-1$
+					prefixes.add(line.substring("ref-prefix ".length())); //$NON-NLS-1$
 				} else {
 					throw new PackProtocolException(MessageFormat
 							.format(JGitText.get().unexpectedPacketLine, line));
@@ -905,21 +913,28 @@
 			throw new PackProtocolException(MessageFormat
 					.format(JGitText.get().unexpectedPacketLine, line));
 		}
-		rawOut.stopBuffering();
+		LsRefsV2Request req = builder.setRefPrefixes(prefixes).build();
 
+		protocolV2Hook.onLsRefs(req);
+
+		rawOut.stopBuffering();
+		PacketLineOutRefAdvertiser adv = new PacketLineOutRefAdvertiser(pckOut);
+		adv.setUseProtocolV2(true);
+		if (req.getPeel()) {
+			adv.setDerefTags(true);
+		}
 		Map<String, Ref> refsToSend;
-		if (refPrefixes.isEmpty()) {
+		if (req.getRefPrefixes().isEmpty()) {
 			refsToSend = getAdvertisedOrDefaultRefs();
 		} else {
 			refsToSend = new HashMap<>();
-			for (String refPrefix : refPrefixes) {
+			for (String refPrefix : req.getRefPrefixes()) {
 				for (Ref ref : db.getRefDatabase().getRefsByPrefix(refPrefix)) {
 					refsToSend.put(ref.getName(), ref);
 				}
 			}
 		}
-
-		if (needToFindSymrefs) {
+		if (req.getSymrefs()) {
 			findSymrefs(adv, refsToSend);
 		}
 
@@ -928,12 +943,6 @@
 	}
 
 	private void fetchV2() throws IOException {
-		options = new HashSet<>();
-
-		// Packs are always sent multiplexed and using full 64K
-		// lengths.
-		options.add(OPTION_SIDE_BAND_64K);
-
 		// Depending on the requestValidator, #processHaveLines may
 		// require that advertised be set. Set it only in the required
 		// circumstances (to avoid a full ref lookup in the case that
@@ -946,113 +955,50 @@
 			advertised = refIdSet(getAdvertisedOrDefaultRefs().values());
 		}
 
-		String line;
-		List<ObjectId> peerHas = new ArrayList<>();
-		boolean doneReceived = false;
-
-		// Currently, we do not support any capabilities, so the next
-		// line is DELIM.
-		if ((line = pckIn.readString()) != PacketLineIn.DELIM) {
-			throw new PackProtocolException(MessageFormat
-					.format(JGitText.get().unexpectedPacketLine, line));
-		}
-
-		boolean includeTag = false;
-		boolean filterReceived = false;
-		while ((line = pckIn.readString()) != PacketLineIn.END) {
-			if (line.startsWith("want ")) { //$NON-NLS-1$
-				wantIds.add(ObjectId.fromString(line.substring(5)));
-			} else if (line.startsWith("have ")) { //$NON-NLS-1$
-				peerHas.add(ObjectId.fromString(line.substring(5)));
-			} else if (line.equals("done")) { //$NON-NLS-1$
-				doneReceived = true;
-			} else if (line.equals(OPTION_THIN_PACK)) {
-				options.add(OPTION_THIN_PACK);
-			} else if (line.equals(OPTION_NO_PROGRESS)) {
-				options.add(OPTION_NO_PROGRESS);
-			} else if (line.equals(OPTION_INCLUDE_TAG)) {
-				options.add(OPTION_INCLUDE_TAG);
-				includeTag = true;
-			} else if (line.equals(OPTION_OFS_DELTA)) {
-				options.add(OPTION_OFS_DELTA);
-			} else if (line.startsWith("shallow ")) { //$NON-NLS-1$
-				clientShallowCommits.add(ObjectId.fromString(line.substring(8)));
-			} else if (line.startsWith("deepen ")) { //$NON-NLS-1$
-				depth = Integer.parseInt(line.substring(7));
-				if (depth <= 0) {
-					throw new PackProtocolException(
-							MessageFormat.format(JGitText.get().invalidDepth,
-									Integer.valueOf(depth)));
-				}
-				if (shallowSince != 0) {
-					throw new PackProtocolException(
-							JGitText.get().deepenSinceWithDeepen);
-				}
-				if (shallowExcludeRefs != null) {
-					throw new PackProtocolException(
-							JGitText.get().deepenNotWithDeepen);
-				}
-			} else if (line.startsWith("deepen-not ")) { //$NON-NLS-1$
-				List<String> exclude = shallowExcludeRefs;
-				if (exclude == null) {
-					exclude = shallowExcludeRefs = new ArrayList<>();
-				}
-				exclude.add(line.substring(11));
-				if (depth != 0) {
-					throw new PackProtocolException(
-							JGitText.get().deepenNotWithDeepen);
-				}
-			} else if (line.equals(OPTION_DEEPEN_RELATIVE)) {
-				options.add(OPTION_DEEPEN_RELATIVE);
-			} else if (line.startsWith("deepen-since ")) { //$NON-NLS-1$
-				shallowSince = Integer.parseInt(line.substring(13));
-				if (shallowSince <= 0) {
-					throw new PackProtocolException(
-							MessageFormat.format(
-									JGitText.get().invalidTimestamp, line));
-				}
-				if (depth !=  0) {
-					throw new PackProtocolException(
-							JGitText.get().deepenSinceWithDeepen);
-				}
-			} else if (transferConfig.isAllowFilter()
-					&& line.startsWith(OPTION_FILTER + ' ')) {
-				if (filterReceived) {
-					throw new PackProtocolException(JGitText.get().tooManyFilters);
-				}
-				filterReceived = true;
-				parseFilter(line.substring(OPTION_FILTER.length() + 1));
-			} else {
-				throw new PackProtocolException(MessageFormat
-						.format(JGitText.get().unexpectedPacketLine, line));
-			}
-		}
+		ProtocolV2Parser parser = new ProtocolV2Parser(transferConfig);
+		FetchV2Request req = parser.parseFetchRequest(pckIn,
+				db.getRefDatabase());
 		rawOut.stopBuffering();
 
+		protocolV2Hook.onFetch(req);
+
+		// TODO(ifrade): Refactor to pass around the Request object, instead of
+		// copying data back to class fields
+		options = req.getOptions();
+		wantIds.addAll(req.getWantsIds());
+		clientShallowCommits = req.getClientShallowCommits();
+		depth = req.getDepth();
+		shallowSince = req.getDeepenSince();
+		filterBlobLimit = req.getFilterBlobLimit();
+		deepenNotRefs = req.getDeepenNotRefs();
+
 		boolean sectionSent = false;
 		@Nullable List<ObjectId> shallowCommits = null;
 		List<ObjectId> unshallowCommits = new ArrayList<>();
 
-		if (!clientShallowCommits.isEmpty()) {
-			verifyClientShallow();
+		if (!req.getClientShallowCommits().isEmpty()) {
+			verifyClientShallow(req.getClientShallowCommits());
 		}
-		if (depth != 0 || shallowSince != 0 || shallowExcludeRefs != null) {
-			shallowCommits = new ArrayList<ObjectId>();
+		if (req.getDepth() != 0 || req.getDeepenSince() != 0
+				|| !req.getDeepenNotRefs().isEmpty()) {
+			shallowCommits = new ArrayList<>();
 			processShallow(shallowCommits, unshallowCommits, false);
 		}
-		if (!clientShallowCommits.isEmpty())
-			walk.assumeShallow(clientShallowCommits);
+		if (!req.getClientShallowCommits().isEmpty())
+			walk.assumeShallow(req.getClientShallowCommits());
 
-		if (doneReceived) {
-			processHaveLines(peerHas, ObjectId.zeroId(), new PacketLineOut(NullOutputStream.INSTANCE));
+		if (req.wasDoneReceived()) {
+			processHaveLines(req.getPeerHas(), ObjectId.zeroId(),
+					new PacketLineOut(NullOutputStream.INSTANCE));
 		} else {
 			pckOut.writeString("acknowledgments\n"); //$NON-NLS-1$
-			for (ObjectId id : peerHas) {
+			for (ObjectId id : req.getPeerHas()) {
 				if (walk.getObjectReader().has(id)) {
 					pckOut.writeString("ACK " + id.getName() + "\n"); //$NON-NLS-1$ //$NON-NLS-2$
 				}
 			}
-			processHaveLines(peerHas, ObjectId.zeroId(), new PacketLineOut(NullOutputStream.INSTANCE));
+			processHaveLines(req.getPeerHas(), ObjectId.zeroId(),
+					new PacketLineOut(NullOutputStream.INSTANCE));
 			if (okToGiveUp()) {
 				pckOut.writeString("ready\n"); //$NON-NLS-1$
 			} else if (commonBase.isEmpty()) {
@@ -1061,7 +1007,7 @@
 			sectionSent = true;
 		}
 
-		if (doneReceived || okToGiveUp()) {
+		if (req.wasDoneReceived() || okToGiveUp()) {
 			if (shallowCommits != null) {
 				if (sectionSent)
 					pckOut.writeDelim();
@@ -1075,16 +1021,33 @@
 				sectionSent = true;
 			}
 
+			if (!req.getWantedRefs().isEmpty()) {
+				if (sectionSent) {
+					pckOut.writeDelim();
+				}
+				pckOut.writeString("wanted-refs\n"); //$NON-NLS-1$
+				for (Map.Entry<String, ObjectId> entry : req.getWantedRefs()
+						.entrySet()) {
+					pckOut.writeString(entry.getValue().getName() + ' ' +
+							entry.getKey() + '\n');
+				}
+				sectionSent = true;
+			}
+
 			if (sectionSent)
 				pckOut.writeDelim();
 			pckOut.writeString("packfile\n"); //$NON-NLS-1$
 			sendPack(new PackStatistics.Accumulator(),
-					includeTag
+					req.getOptions().contains(OPTION_INCLUDE_TAG)
 						? db.getRefDatabase().getRefsByPrefix(R_TAGS)
 						: null,
 					unshallowCommits);
+			// sendPack invokes pckOut.end() for us, so we do not
+			// need to invoke it here.
+		} else {
+			// Invoke pckOut.end() by ourselves.
+			pckOut.end();
 		}
-		pckOut.end();
 	}
 
 	/*
@@ -1121,9 +1084,13 @@
 		ArrayList<String> caps = new ArrayList<>();
 		caps.add("version 2"); //$NON-NLS-1$
 		caps.add(COMMAND_LS_REFS);
+		boolean advertiseRefInWant = transferConfig.isAllowRefInWant() &&
+				db.getConfig().getBoolean("uploadpack", null, //$NON-NLS-1$
+						"advertiserefinwant", true); //$NON-NLS-1$
 		caps.add(
 				COMMAND_FETCH + '=' +
 				(transferConfig.isAllowFilter() ? OPTION_FILTER + ' ' : "") + //$NON-NLS-1$
+				(advertiseRefInWant ? CAPABILITY_REF_IN_WANT + ' ' : "") + //$NON-NLS-1$
 				OPTION_SHALLOW);
 		return caps;
 	}
@@ -1134,6 +1101,8 @@
 			// is sent only if this is a bidirectional pipe. (If
 			// not, the client is expected to call
 			// sendAdvertisedRefs() on its own.)
+			protocolV2Hook
+					.onCapabilities(CapabilitiesV2Request.builder().build());
 			for (String s : getV2CapabilityAdvertisement()) {
 				pckOut.writeString(s + "\n"); //$NON-NLS-1$
 			}
@@ -1181,7 +1150,7 @@
 			boolean writeToPckOut) throws IOException {
 		if (options.contains(OPTION_DEEPEN_RELATIVE) ||
 				shallowSince != 0 ||
-				shallowExcludeRefs != null) {
+				!deepenNotRefs.isEmpty()) {
 			// TODO(jonathantanmy): Implement deepen-relative, deepen-since,
 			// and deepen-not.
 			throw new UnsupportedOperationException();
@@ -1232,9 +1201,14 @@
 		}
 	}
 
-	private void verifyClientShallow()
+	/*
+	 * Verify all shallow lines refer to commits
+	 *
+	 * It can mutate the input set (removing missing object ids from it)
+	 */
+	private void verifyClientShallow(Set<ObjectId> shallowCommits)
 			throws IOException, PackProtocolException {
-		AsyncRevObjectQueue q = walk.parseAny(clientShallowCommits, true);
+		AsyncRevObjectQueue q = walk.parseAny(shallowCommits, true);
 		try {
 			for (;;) {
 				try {
@@ -1252,7 +1226,7 @@
 				} catch (MissingObjectException notCommit) {
 					// shallow objects not known at the server are ignored
 					// by git-core upload-pack, match that behavior.
-					clientShallowCommits.remove(notCommit.getObjectId());
+					shallowCommits.remove(notCommit.getObjectId());
 					continue;
 				}
 			}
@@ -1298,6 +1272,8 @@
 		if (useProtocolV2()) {
 			// The equivalent in v2 is only the capabilities
 			// advertisement.
+			protocolV2Hook
+					.onCapabilities(CapabilitiesV2Request.builder().build());
 			for (String s : getV2CapabilityAdvertisement()) {
 				adv.writeOne(s);
 			}
@@ -1382,33 +1358,6 @@
 		return msgOut;
 	}
 
-	private void parseFilter(String arg) throws PackProtocolException {
-		if (arg.equals("blob:none")) { //$NON-NLS-1$
-			filterBlobLimit = 0;
-		} else if (arg.startsWith("blob:limit=")) { //$NON-NLS-1$
-			try {
-				filterBlobLimit = Long.parseLong(
-						arg.substring("blob:limit=".length())); //$NON-NLS-1$
-			} catch (NumberFormatException e) {
-				throw new PackProtocolException(
-						MessageFormat.format(JGitText.get().invalidFilter,
-								arg));
-			}
-		}
-		/*
-		 * We must have (1) either "blob:none" or
-		 * "blob:limit=" set (because we only support
-		 * blob size limits for now), and (2) if the
-		 * latter, then it must be nonnegative. Throw
-		 * if (1) or (2) is not met.
-		 */
-		if (filterBlobLimit < 0) {
-			throw new PackProtocolException(
-					MessageFormat.format(JGitText.get().invalidFilter,
-							arg));
-		}
-	}
-
 	private void recvWants() throws IOException {
 		boolean isFirst = true;
 		boolean filterReceived = false;
@@ -1449,7 +1398,7 @@
 				}
 				filterReceived = true;
 
-				parseFilter(arg);
+				filterBlobLimit = ProtocolV2Parser.filterLine(arg);
 				continue;
 			}
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/WalkRemoteObjectDatabase.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/WalkRemoteObjectDatabase.java
index aa71c94..6d4df4f 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/WalkRemoteObjectDatabase.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/WalkRemoteObjectDatabase.java
@@ -43,6 +43,8 @@
 
 package org.eclipse.jgit.transport;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.BufferedReader;
 import java.io.ByteArrayOutputStream;
 import java.io.FileNotFoundException;
@@ -363,7 +365,7 @@
 	 */
 	BufferedReader openReader(String path) throws IOException {
 		final InputStream is = open(path).in;
-		return new BufferedReader(new InputStreamReader(is, Constants.CHARSET));
+		return new BufferedReader(new InputStreamReader(is, UTF_8));
 	}
 
 	/**
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/AbstractTreeIterator.java b/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/AbstractTreeIterator.java
index 470ed02..335abe1 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/AbstractTreeIterator.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/AbstractTreeIterator.java
@@ -45,6 +45,8 @@
 
 package org.eclipse.jgit.treewalk;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.nio.CharBuffer;
@@ -182,7 +184,7 @@
 		if (prefix != null && prefix.length() > 0) {
 			final ByteBuffer b;
 
-			b = Constants.CHARSET.encode(CharBuffer.wrap(prefix));
+			b = UTF_8.encode(CharBuffer.wrap(prefix));
 			pathLen = b.limit();
 			path = new byte[Math.max(DEFAULT_PATH_SIZE, pathLen + 1)];
 			b.get(path, 0, pathLen);
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/TreeWalk.java b/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/TreeWalk.java
index d500aae..69303d6 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/TreeWalk.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/TreeWalk.java
@@ -44,10 +44,13 @@
 
 package org.eclipse.jgit.treewalk;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
+import java.util.regex.Matcher;
 
 import org.eclipse.jgit.annotations.Nullable;
 import org.eclipse.jgit.api.errors.JGitInternalException;
@@ -1045,7 +1048,7 @@
 		final AbstractTreeIterator t = currentHead;
 		final int off = t.pathOffset;
 		final int end = t.pathLen;
-		return RawParseUtils.decode(Constants.CHARSET, t.path, off, end);
+		return RawParseUtils.decode(UTF_8, t.path, off, end);
 	}
 
 	/**
@@ -1378,11 +1381,11 @@
 	}
 
 	static String pathOf(AbstractTreeIterator t) {
-		return RawParseUtils.decode(Constants.CHARSET, t.path, 0, t.pathLen);
+		return RawParseUtils.decode(UTF_8, t.path, 0, t.pathLen);
 	}
 
 	static String pathOf(byte[] buf, int pos, int end) {
-		return RawParseUtils.decode(Constants.CHARSET, buf, pos, end);
+		return RawParseUtils.decode(UTF_8, buf, pos, end);
 	}
 
 	/**
@@ -1436,7 +1439,8 @@
 			return null;
 		}
 		return filterCommand.replaceAll("%f", //$NON-NLS-1$
-				QuotedString.BOURNE.quote((getPathString())));
+				Matcher.quoteReplacement(
+						QuotedString.BOURNE.quote((getPathString()))));
 	}
 
 	/**
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/WorkingTreeIterator.java b/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/WorkingTreeIterator.java
index 179fd46..7c6bfb9 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/WorkingTreeIterator.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/treewalk/WorkingTreeIterator.java
@@ -46,6 +46,8 @@
 
 package org.eclipse.jgit.treewalk;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.ByteArrayInputStream;
 import java.io.File;
 import java.io.FileInputStream;
@@ -1413,7 +1415,7 @@
 
 		IteratorState(WorkingTreeOptions options) {
 			this.options = options;
-			this.nameEncoder = Constants.CHARSET.newEncoder();
+			this.nameEncoder = UTF_8.newEncoder();
 		}
 
 		void initializeReadBuffer() {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/Base64.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/Base64.java
index 442f079..69f8547 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/util/Base64.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/Base64.java
@@ -6,7 +6,7 @@
 
 package org.eclipse.jgit.util;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.text.MessageFormat;
 import java.util.Arrays;
@@ -54,7 +54,7 @@
 				+ "abcdefghijklmnopqrstuvwxyz" // //$NON-NLS-1$
 				+ "0123456789" // //$NON-NLS-1$
 				+ "+/" // //$NON-NLS-1$
-		).getBytes(CHARSET);
+		).getBytes(UTF_8);
 
 		DEC = new byte[128];
 		Arrays.fill(DEC, INVALID_DEC);
@@ -177,7 +177,7 @@
 			e += 4;
 		}
 
-		return new String(outBuff, 0, e, CHARSET);
+		return new String(outBuff, 0, e, UTF_8);
 	}
 
 	/**
@@ -293,7 +293,7 @@
 	 * @return the decoded data
 	 */
 	public static byte[] decode(String s) {
-		byte[] bytes = s.getBytes(CHARSET);
+		byte[] bytes = s.getBytes(UTF_8);
 		return decode(bytes, 0, bytes.length);
 	}
 }
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/FS.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/FS.java
index 8948e60..e5c2922 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/util/FS.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/FS.java
@@ -640,12 +640,15 @@
 							JGitText.get().commandClosedStderrButDidntExit,
 							desc, PROCESS_EXIT_TIMEOUT), -1);
 					fail.set(true);
+					return false;
 				}
 			} catch (InterruptedException e) {
-				LOG.error(MessageFormat.format(
-						JGitText.get().threadInterruptedWhileRunning, desc), e);
+				setError(originalError, MessageFormat.format(
+						JGitText.get().threadInterruptedWhileRunning, desc), -1);
+				fail.set(true);
+				return false;
 			}
-			return false;
+			return true;
 		}
 
 		private void setError(IOException e, String message, int exitCode) {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/FS_Win32.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/FS_Win32.java
index 9f99e28..98797dc 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/util/FS_Win32.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/FS_Win32.java
@@ -169,7 +169,7 @@
 		if (result.isEmpty()) {
 			return NO_ENTRIES;
 		}
-		return result.toArray(new Entry[result.size()]);
+		return result.toArray(new Entry[0]);
 	}
 
 	/** {@inheritDoc} */
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/FS_Win32_Cygwin.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/FS_Win32_Cygwin.java
index 3393fbf..e5c8d9d 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/util/FS_Win32_Cygwin.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/FS_Win32_Cygwin.java
@@ -43,7 +43,7 @@
 
 package org.eclipse.jgit.util;
 
-import static org.eclipse.jgit.lib.Constants.CHARSET;
+import static java.nio.charset.StandardCharsets.UTF_8;
 
 import java.io.File;
 import java.io.PrintStream;
@@ -126,7 +126,7 @@
 			try {
 				w = readPipe(dir, //
 					new String[] { cygpath, "--windows", "--absolute", pn }, // //$NON-NLS-1$ //$NON-NLS-2$
-					CHARSET.name());
+					UTF_8.name());
 			} catch (CommandFailedException e) {
 				LOG.warn(e.getMessage());
 				return null;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/FileUtils.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/FileUtils.java
index 2f547c1..ecfd316 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/util/FileUtils.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/FileUtils.java
@@ -45,6 +45,8 @@
 
 package org.eclipse.jgit.util;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.File;
 import java.io.IOException;
 import java.nio.file.AtomicMoveNotSupportedException;
@@ -712,7 +714,7 @@
 		Path nioPath = toPath(file);
 		if (Files.isSymbolicLink(nioPath))
 			return Files.readSymbolicLink(nioPath).toString()
-					.getBytes(Constants.CHARSET).length;
+					.getBytes(UTF_8).length;
 		return Files.size(nioPath);
 	}
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/QuotedString.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/QuotedString.java
index 4d58d06..a55cad3 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/util/QuotedString.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/QuotedString.java
@@ -43,6 +43,8 @@
 
 package org.eclipse.jgit.util;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.util.Arrays;
 
 import org.eclipse.jgit.lib.Constants;
@@ -181,7 +183,7 @@
 					continue;
 				}
 			}
-			return RawParseUtils.decode(Constants.CHARSET, r, 0, rPtr);
+			return RawParseUtils.decode(UTF_8, r, 0, rPtr);
 		}
 	}
 
@@ -294,7 +296,7 @@
 		public String dequote(byte[] in, int inPtr, int inEnd) {
 			if (2 <= inEnd - inPtr && in[inPtr] == '"' && in[inEnd - 1] == '"')
 				return dq(in, inPtr + 1, inEnd - 1);
-			return RawParseUtils.decode(Constants.CHARSET, in, inPtr, inEnd);
+			return RawParseUtils.decode(UTF_8, in, inPtr, inEnd);
 		}
 
 		private static String dq(byte[] in, int inPtr, int inEnd) {
@@ -370,7 +372,7 @@
 				}
 			}
 
-			return RawParseUtils.decode(Constants.CHARSET, r, 0, rPtr);
+			return RawParseUtils.decode(UTF_8, r, 0, rPtr);
 		}
 
 		private GitPathStyle() {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/RawParseUtils.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/RawParseUtils.java
index c22c8de..28f406a 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/util/RawParseUtils.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/RawParseUtils.java
@@ -549,6 +549,62 @@
 	}
 
 	/**
+	 * Locate the end of the header.  Note that headers may be
+	 * more than one line long.
+	 * @param b
+	 *            buffer to scan.
+	 * @param ptr
+	 *            position within buffer to start looking for the end-of-header.
+	 * @return new position just after the header.  This is either
+	 * b.length, or the index of the header's terminating newline.
+	 * @since 5.1
+	 */
+	public static final int headerEnd(final byte[] b, int ptr) {
+		final int sz = b.length;
+		while (ptr < sz) {
+			final byte c = b[ptr++];
+			if (c == '\n' && (ptr == sz || b[ptr] != ' ')) {
+				return ptr - 1;
+			}
+		}
+		return ptr - 1;
+	}
+
+	/**
+	 * Find the start of the contents of a given header.
+	 *
+	 * @param b
+	 *            buffer to scan.
+	 * @param headerName
+	 *            header to search for
+	 * @param ptr
+	 *            position within buffer to start looking for header at.
+	 * @return new position at the start of the header's contents, -1 for
+	 *         not found
+	 * @since 5.1
+	 */
+	public static final int headerStart(byte[] headerName, byte[] b, int ptr) {
+		// Start by advancing to just past a LF or buffer start
+		if (ptr != 0) {
+			ptr = nextLF(b, ptr - 1);
+		}
+		while (ptr < b.length - (headerName.length + 1)) {
+			boolean found = true;
+			for (int i = 0; i < headerName.length; i++) {
+				if (headerName[i] != b[ptr++]) {
+					found = false;
+					break;
+				}
+			}
+			if (found && b[ptr++] == ' ') {
+				return ptr;
+			}
+			ptr = nextLF(b, ptr);
+		}
+		return -1;
+	}
+
+	/**
 	 * Locate the first position before a given character.
 	 *
 	 * @param b
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/io/MessageWriter.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/io/MessageWriter.java
index 94e5ef3..12d809b 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/util/io/MessageWriter.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/io/MessageWriter.java
@@ -43,13 +43,14 @@
 
 package org.eclipse.jgit.util.io;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.io.OutputStreamWriter;
 import java.io.Writer;
 
-import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.util.RawParseUtils;
 
 /**
@@ -80,7 +81,7 @@
 	 */
 	public MessageWriter() {
 		buf = new ByteArrayOutputStream();
-		enc = new OutputStreamWriter(getRawStream(), Constants.CHARSET);
+		enc = new OutputStreamWriter(getRawStream(), UTF_8);
 	}
 
 	/** {@inheritDoc} */
diff --git a/pom.xml b/pom.xml
index 3347847..26bd7d1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -51,7 +51,7 @@
   <groupId>org.eclipse.jgit</groupId>
   <artifactId>org.eclipse.jgit-parent</artifactId>
   <packaging>pom</packaging>
-  <version>5.0.4-SNAPSHOT</version>
+  <version>5.1.2-SNAPSHOT</version>
 
   <name>JGit - Parent</name>
   <url>${jgit-url}</url>
@@ -207,17 +207,18 @@
     <commons-compress-version>1.15</commons-compress-version>
     <osgi-core-version>4.3.1</osgi-core-version>
     <servlet-api-version>3.1.0</servlet-api-version>
-    <jetty-version>9.4.8.v20171121</jetty-version>
-    <japicmp-version>0.11.0</japicmp-version>
-    <httpclient-version>4.5.2</httpclient-version>
-    <httpcore-version>4.4.6</httpcore-version>
+    <jetty-version>9.4.11.v20180605</jetty-version>
+    <japicmp-version>0.13.0</japicmp-version>
+    <httpclient-version>4.5.5</httpclient-version>
+    <httpcore-version>4.4.9</httpcore-version>
     <slf4j-version>1.7.2</slf4j-version>
     <log4j-version>1.2.15</log4j-version>
     <maven-javadoc-plugin-version>3.0.1</maven-javadoc-plugin-version>
-    <tycho-extras-version>1.1.0</tycho-extras-version>
+    <tycho-extras-version>1.2.0</tycho-extras-version>
     <gson-version>2.8.2</gson-version>
-    <spotbugs-maven-plugin-version>3.1.2</spotbugs-maven-plugin-version>
-    <maven-surefire-report-plugin-version>2.20.1</maven-surefire-report-plugin-version>
+    <spotbugs-maven-plugin-version>3.1.6</spotbugs-maven-plugin-version>
+    <maven-surefire-report-plugin-version>2.21.0</maven-surefire-report-plugin-version>
+    <maven-compiler-plugin-version>3.8.0</maven-compiler-plugin-version>
 
     <!-- Properties to enable jacoco code coverage analysis -->
     <sonar.core.codeCoveragePlugin>jacoco</sonar.core.codeCoveragePlugin>
@@ -249,7 +250,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-jar-plugin</artifactId>
-          <version>3.0.2</version>
+          <version>3.1.0</version>
           <configuration>
             <archive>
               <manifestEntries>
@@ -268,13 +269,13 @@
 
         <plugin>
           <artifactId>maven-clean-plugin</artifactId>
-          <version>3.0.0</version>
+          <version>3.1.0</version>
         </plugin>
 
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-shade-plugin</artifactId>
-          <version>3.1.0</version>
+          <version>3.1.1</version>
         </plugin>
 
         <plugin>
@@ -304,7 +305,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-surefire-plugin</artifactId>
-          <version>2.20.1</version>
+          <version>2.21.0</version>
           <configuration>
             <forkCount>${test-fork-count}</forkCount>
             <reuseForks>true</reuseForks>
@@ -337,7 +338,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-pmd-plugin</artifactId>
-          <version>3.8</version>
+          <version>3.10.0</version>
           <configuration>
             <sourceEncoding>utf-8</sourceEncoding>
             <minimumTokens>100</minimumTokens>
@@ -360,7 +361,7 @@
         <plugin>
           <groupId>org.eclipse.cbi.maven.plugins</groupId>
           <artifactId>eclipse-jarsigner-plugin</artifactId>
-          <version>1.1.4</version>
+          <version>1.1.5</version>
         </plugin>
         <plugin>
           <groupId>org.eclipse.tycho.extras</groupId>
@@ -375,17 +376,17 @@
         <plugin>
           <groupId>org.jacoco</groupId>
           <artifactId>jacoco-maven-plugin</artifactId>
-          <version>0.7.9</version>
+          <version>0.8.1</version>
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-site-plugin</artifactId>
-          <version>3.6</version>
+          <version>3.7.1</version>
           <dependencies>
             <dependency><!-- add support for ssh/scp -->
               <groupId>org.apache.maven.wagon</groupId>
               <artifactId>wagon-ssh</artifactId>
-              <version>2.12</version>
+              <version>3.1.0</version>
             </dependency>
           </dependencies>
         </plugin>
@@ -744,7 +745,7 @@
         <plugins>
           <plugin>
             <artifactId>maven-compiler-plugin</artifactId>
-            <version>3.7.0</version>
+            <version>${maven-compiler-plugin-version}</version>
             <configuration>
               <encoding>UTF-8</encoding>
               <source>1.8</source>
@@ -772,6 +773,9 @@
                 <configuration>
                   <compilerId>javac-with-errorprone</compilerId>
                   <forceJavacCompilerUse>true</forceJavacCompilerUse>
+                  <compilerArgs>
+                    <arg>-Xep:ExpectedExceptionChecker:ERROR</arg>
+                  </compilerArgs>
                   <excludes>
                     <exclude>org/eclipse/jgit/transport/InsecureCipherFactory.java</exclude>
                   </excludes>
@@ -782,7 +786,7 @@
               <dependency>
                 <groupId>org.codehaus.plexus</groupId>
                 <artifactId>plexus-compiler-javac</artifactId>
-                <version>2.8.2</version>
+                <version>2.8.4</version>
               </dependency>
               <dependency>
                 <groupId>org.codehaus.plexus</groupId>
@@ -810,7 +814,7 @@
         <plugins>
           <plugin>
             <artifactId>maven-compiler-plugin</artifactId>
-            <version>3.7.0</version>
+            <version>${maven-compiler-plugin-version}</version>
             <configuration>
               <compilerId>eclipse</compilerId>
               <encoding>UTF-8</encoding>