diff --git a/gerrit-httpd/BUCK b/gerrit-httpd/BUCK
index e215533..b29bd2a 100644
--- a/gerrit-httpd/BUCK
+++ b/gerrit-httpd/BUCK
@@ -34,7 +34,7 @@
     '//lib/jgit:jgit',
     '//lib/jgit:jgit-servlet',
     '//lib/log:api',
-    '//lib/lucene:core',
+    '//lib/lucene:core-and-backward-codecs',
   ],
   provided_deps = ['//lib:servlet-api-3_1'],
   visibility = ['PUBLIC'],
diff --git a/gerrit-lucene/BUCK b/gerrit-lucene/BUCK
index a146774..8ba7479 100644
--- a/gerrit-lucene/BUCK
+++ b/gerrit-lucene/BUCK
@@ -11,7 +11,7 @@
     '//gerrit-server:server',
     '//lib:gwtorm',
     '//lib:guava',
-    '//lib/lucene:core',
+    '//lib/lucene:core-and-backward-codecs',
   ],
   visibility = ['PUBLIC'],
 )
@@ -34,8 +34,7 @@
     '//lib/jgit:jgit',
     '//lib/log:api',
     '//lib/lucene:analyzers-common',
-    '//lib/lucene:backward-codecs',
-    '//lib/lucene:core',
+    '//lib/lucene:core-and-backward-codecs',
     '//lib/lucene:misc',
   ],
   visibility = ['PUBLIC'],
diff --git a/gerrit-server/BUCK b/gerrit-server/BUCK
index f7bb86f..31a9b49 100644
--- a/gerrit-server/BUCK
+++ b/gerrit-server/BUCK
@@ -63,7 +63,7 @@
     '//lib/log:jsonevent-layout',
     '//lib/log:log4j',
     '//lib/lucene:analyzers-common',
-    '//lib/lucene:core',
+    '//lib/lucene:core-and-backward-codecs',
     '//lib/lucene:queryparser',
     '//lib/ow2:ow2-asm',
     '//lib/ow2:ow2-asm-tree',
diff --git a/lib/asciidoctor/BUCK b/lib/asciidoctor/BUCK
index f8feb63..ad13313 100644
--- a/lib/asciidoctor/BUCK
+++ b/lib/asciidoctor/BUCK
@@ -36,7 +36,7 @@
     '//lib:args4j',
     '//lib:guava',
     '//lib/lucene:analyzers-common',
-    '//lib/lucene:core',
+    '//lib/lucene:core-and-backward-codecs',
   ],
   visibility = ['//tools/eclipse:classpath'],
 )
diff --git a/lib/lucene/BUCK b/lib/lucene/BUCK
index 6ab33d9..5e4a82f 100644
--- a/lib/lucene/BUCK
+++ b/lib/lucene/BUCK
@@ -2,8 +2,19 @@
 
 VERSION = '5.2.1'
 
+# core and backward-codecs both provide
+# META-INF/services/org.apache.lucene.codecs.Codec, so they must be merged.
+merge_maven_jars(
+  name = 'core-and-backward-codecs',
+  srcs = [
+    ':backward-codecs_jar',
+    ':core_jar',
+  ],
+  visibility = ['PUBLIC'],
+)
+
 maven_jar(
-  name = 'core',
+  name = 'core_jar',
   id = 'org.apache.lucene:lucene-core:' + VERSION,
   sha1 = 'a175590aa8b04e079eb1a136fd159f9163482ba4',
   license = 'Apache2.0',
@@ -11,6 +22,7 @@
     'META-INF/LICENSE.txt',
     'META-INF/NOTICE.txt',
   ],
+  visibility = [],
 )
 
 maven_jar(
@@ -18,7 +30,7 @@
   id = 'org.apache.lucene:lucene-analyzers-common:' + VERSION,
   sha1 = '33b7cc17d5a7c939af6fe3f67563f4709926d7f5',
   license = 'Apache2.0',
-  deps = [':core'],
+  deps = [':core-and-backward-codecs'],
   exclude = [
     'META-INF/LICENSE.txt',
     'META-INF/NOTICE.txt',
@@ -26,15 +38,16 @@
 )
 
 maven_jar(
-  name = 'backward-codecs',
+  name = 'backward-codecs_jar',
   id = 'org.apache.lucene:lucene-backward-codecs:' + VERSION,
   sha1 = '603d1f06b133449272799d698e5118db65e523ba',
   license = 'Apache2.0',
-  deps = [':core'],
+  deps = [':core_jar'],
   exclude = [
     'META-INF/LICENSE.txt',
     'META-INF/NOTICE.txt',
   ],
+  visibility = [],
 )
 
 maven_jar(
@@ -42,7 +55,7 @@
   id = 'org.apache.lucene:lucene-misc:' + VERSION,
   sha1 = 'be0a4f0ac06f0a2fa3689b4bf6cd1fe6847f9969',
   license = 'Apache2.0',
-  deps = [':core'],
+  deps = [':core-and-backward-codecs'],
   exclude = [
     'META-INF/LICENSE.txt',
     'META-INF/NOTICE.txt',
@@ -54,7 +67,7 @@
   id = 'org.apache.lucene:lucene-queryparser:' + VERSION,
   sha1 = '73be0a2d4ab3e6b574be1938bfb27f7f730f0ad9',
   license = 'Apache2.0',
-  deps = [':core'],
+  deps = [':core-and-backward-codecs'],
   exclude = [
     'META-INF/LICENSE.txt',
     'META-INF/NOTICE.txt',
diff --git a/lib/maven.defs b/lib/maven.defs
index 17f0e00..dd8097e 100644
--- a/lib/maven.defs
+++ b/lib/maven.defs
@@ -150,3 +150,30 @@
       visibility = visibility,
     )
 
+
+def merge_maven_jars(
+    name,
+    srcs,
+    visibility = []):
+
+  def cmd(jars):
+    return ('$(location //tools:merge_jars) $OUT '
+            + ' '.join(['$(location %s)' % j for j in jars]))
+
+  genrule(
+    name = '%s__merged_bin' % name,
+    cmd = cmd(['%s__download_bin' % s for s in srcs]),
+    out = '%s__merged.jar' % name,
+  )
+  genrule(
+    name = '%s__merged_src' % name,
+    cmd = cmd(['%s__download_src' % s for s in srcs]),
+    # tools/eclipse/project.py requires -src.jar suffix.
+    out = '%s__merged-src.jar' % name,
+  )
+  prebuilt_jar(
+    name = name,
+    binary_jar = ':%s__merged_bin' % name,
+    source_jar = ':%s__merged_src' % name,
+    visibility = visibility,
+  )
diff --git a/tools/BUCK b/tools/BUCK
index ee26062..0bdff3c 100644
--- a/tools/BUCK
+++ b/tools/BUCK
@@ -6,6 +6,12 @@
 )
 
 python_binary(
+  name = 'merge_jars',
+  main = 'merge_jars.py',
+  visibility = ['PUBLIC'],
+)
+
+python_binary(
   name = 'pack_war',
   main = 'pack_war.py',
   deps = [':util'],
diff --git a/tools/merge_jars.py b/tools/merge_jars.py
new file mode 100755
index 0000000..46016c0
--- /dev/null
+++ b/tools/merge_jars.py
@@ -0,0 +1,50 @@
+#!/usr/bin/env python
+# Copyright (C) 2015 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import print_function
+import collections
+import sys
+import zipfile
+
+
+if len(sys.argv) < 3:
+  print('usage: %s <out.zip> <in.zip>...' % sys.argv[0], file=sys.stderr)
+  exit(1)
+
+outfile = sys.argv[1]
+infiles = sys.argv[2:]
+seen = set()
+SERVICES = 'META-INF/services/'
+
+try:
+  with zipfile.ZipFile(outfile, 'w') as outzip:
+    services = collections.defaultdict(lambda: '')
+    for infile in infiles:
+      with zipfile.ZipFile(infile) as inzip:
+        for info in inzip.infolist():
+          n = info.filename
+          if n in seen:
+            continue
+          elif n.startswith(SERVICES):
+            # Concatenate all provider configuration files.
+            services[n] += inzip.read(n)
+            continue
+          outzip.writestr(info, inzip.read(n))
+          seen.add(n)
+
+    for n, v in services.iteritems():
+      outzip.writestr(n, v)
+except Exception as err:
+  exit('Failed to merge jars: %s' % err)