diff --git a/BUILD b/BUILD
index 8455063..6c6b149 100644
--- a/BUILD
+++ b/BUILD
@@ -13,6 +13,13 @@
         "//example-simpleSshCommand",
         "//example-sshCommandAlias",
         "//example-topMenu",
+        "//example-validationListenerAssignee",
+        "//example-validationListenerCommit",
+        "//example-validationListenerHashtag",
+        "//example-validationListenerMerge",
+        "//example-validationListenerNewProjectCreated",
+        "//example-validationListenerRefOperation",
+        "//example-validationListenerUpload",
         "//example-webLinkBranch",
         "//example-webLinkFileHistory",
         "//example-webLinkPatchSet",
diff --git a/example-validationListenerAssignee/.buckconfig b/example-validationListenerAssignee/.buckconfig
new file mode 100644
index 0000000..a597fac
--- /dev/null
+++ b/example-validationListenerAssignee/.buckconfig
@@ -0,0 +1,15 @@
+[alias]
+  plugin = //:example-validationListenerAssignee
+
+[java]
+  src_roots = java, resources
+  source_level = 8
+  target_level = 8
+
+[project]
+  ignore = .git
+
+[cache]
+  mode = dir
+  dir = buck-out/cache
+
diff --git a/example-validationListenerAssignee/.gitignore b/example-validationListenerAssignee/.gitignore
new file mode 100644
index 0000000..db1c934
--- /dev/null
+++ b/example-validationListenerAssignee/.gitignore
@@ -0,0 +1,8 @@
+/target
+/.classpath
+/.settings
+/.project
+/.buckd
+/buck-cache
+/buck-out
+*.iml
diff --git a/example-validationListenerAssignee/BUCK b/example-validationListenerAssignee/BUCK
new file mode 100644
index 0000000..625090c
--- /dev/null
+++ b/example-validationListenerAssignee/BUCK
@@ -0,0 +1,18 @@
+include_defs('//bucklets/gerrit_plugin.bucklet')
+
+gerrit_plugin(
+  name = 'example-validationListenerAssignee',
+  srcs = glob(['src/main/java/**/*.java']),
+  resources = glob(['src/main/**/*']),
+  manifest_entries = [
+    'Gerrit-PluginName: example-validationListenerAssignee',
+    'Gerrit-Module: com.googlesource.gerrit.plugins.examples.validationlistenerassignee.Module',
+    'Implementation-Title: Example Validation Listener Assignee',
+    'Implementation-URL: https://gerrit-review.googlesource.com/#/admin/projects/plugins/examples',
+  ],
+)
+
+java_library(
+  name = 'classpath',
+  deps = [':example-validationListenerAssignee__plugin'],
+)
diff --git a/example-validationListenerAssignee/BUILD b/example-validationListenerAssignee/BUILD
new file mode 100644
index 0000000..586f28a
--- /dev/null
+++ b/example-validationListenerAssignee/BUILD
@@ -0,0 +1,12 @@
+load("//tools/bzl:plugin.bzl", "gerrit_plugin")
+
+gerrit_plugin(
+    name = "example-validationListenerAssignee",
+    srcs = glob(["src/main/java/**/*.java"]),
+    manifest_entries = [
+        "Gerrit-PluginName: example-validationListenerAssignee",
+        "Gerrit-Module: com.googlesource.gerrit.plugins.examples.validationlistenerassignee.Module",
+        "Implementation-Title: Example Validation Listener Assignee",
+    ],
+    resources = glob(["src/main/resources/**/*"]),
+)
diff --git a/example-validationListenerAssignee/LICENSE b/example-validationListenerAssignee/LICENSE
new file mode 100644
index 0000000..11069ed
--- /dev/null
+++ b/example-validationListenerAssignee/LICENSE
@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
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+   "License" shall mean the terms and conditions for use, reproduction,
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+
+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
+   by You to the Licensor shall be under the terms and conditions of
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+   the terms of any separate license agreement you may have executed
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+
+6. Trademarks. This License does not grant permission to use the trade
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+7. Disclaimer of Warranty. Unless required by applicable law or
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+   Contributor provides its Contributions) on an "AS IS" BASIS,
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+8. Limitation of Liability. In no event and under no legal theory,
+   whether in tort (including negligence), contract, or otherwise,
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+   negligent acts) or agreed to in writing, shall any Contributor be
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+APPENDIX: How to apply the Apache License to your work.
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+   To apply the Apache License to your work, attach the following
+   boilerplate notice, with the fields enclosed by brackets "[]"
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+Copyright [yyyy] [name of copyright owner]
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+Licensed under the Apache License, Version 2.0 (the "License");
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+    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
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diff --git a/example-validationListenerAssignee/WORKSPACE b/example-validationListenerAssignee/WORKSPACE
new file mode 100644
index 0000000..f8d65c3
--- /dev/null
+++ b/example-validationListenerAssignee/WORKSPACE
@@ -0,0 +1,26 @@
+workspace(name = "validationListenerAssignee")
+
+load("//:bazlets.bzl", "load_bazlets")
+
+load_bazlets(
+    commit = "0f87babe07a555425d829c6e7951e296e9e24579",
+    #    local_path = "/home/<user>/projects/bazlets",
+)
+
+# Release Plugin API
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_api.bzl",
+    "gerrit_api",
+)
+
+# Snapshot Plugin API
+#load(
+#    "@com_googlesource_gerrit_bazlets//:gerrit_api_maven_local.bzl",
+#    "gerrit_api_maven_local",
+#)
+
+# Load release Plugin API
+gerrit_api()
+
+# Load snapshot Plugin API
+#gerrit_api_maven_local()
diff --git a/example-validationListenerAssignee/bazlets.bzl b/example-validationListenerAssignee/bazlets.bzl
new file mode 100644
index 0000000..e14e488
--- /dev/null
+++ b/example-validationListenerAssignee/bazlets.bzl
@@ -0,0 +1,17 @@
+NAME = "com_googlesource_gerrit_bazlets"
+
+def load_bazlets(
+    commit,
+    local_path = None
+  ):
+  if not local_path:
+      native.git_repository(
+          name = NAME,
+          remote = "https://gerrit.googlesource.com/bazlets",
+          commit = commit,
+      )
+  else:
+      native.local_repository(
+          name = NAME,
+          path = local_path,
+      )
diff --git a/example-validationListenerAssignee/lib/gerrit/BUCK b/example-validationListenerAssignee/lib/gerrit/BUCK
new file mode 100644
index 0000000..8d5f0e9
--- /dev/null
+++ b/example-validationListenerAssignee/lib/gerrit/BUCK
@@ -0,0 +1,20 @@
+include_defs('//bucklets/maven_jar.bucklet')
+
+VER = '2.14-SNAPSHOT'
+REPO = MAVEN_LOCAL
+
+maven_jar(
+  name = 'acceptance-framework',
+  id = 'com.google.gerrit:gerrit-acceptance-framework:' + VER,
+  license = 'Apache2.0',
+  attach_source = False,
+  repository = REPO,
+)
+
+maven_jar(
+  name = 'plugin-api',
+  id = 'com.google.gerrit:gerrit-plugin-api:' + VER,
+  license = 'Apache2.0',
+  attach_source = False,
+  repository = REPO,
+)
diff --git a/example-validationListenerAssignee/pom.xml b/example-validationListenerAssignee/pom.xml
new file mode 100644
index 0000000..ec718bb
--- /dev/null
+++ b/example-validationListenerAssignee/pom.xml
@@ -0,0 +1,85 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+Copyright (C) 2013 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.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>com.googlesource.gerrit.plugins</groupId>
+  <artifactId>example-validationListenerAssignee</artifactId>
+  <packaging>jar</packaging>
+  <version>2.14-SNAPSHOT</version>
+  <properties>
+    <Gerrit-ApiType>plugin</Gerrit-ApiType>
+    <Gerrit-ApiVersion>${project.version}</Gerrit-ApiVersion>
+  </properties>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>2.4</version>
+        <configuration>
+          <archive>
+            <manifestEntries>
+              <Gerrit-PluginName>example-validationListenerAssignee</Gerrit-PluginName>
+              <Gerrit-Module>com.googlesource.gerrit.plugins.examples.validationlistenerassignee.Module</Gerrit-Module>
+
+              <Implementation-Vendor>Gerrit Code Review</Implementation-Vendor>
+              <Implementation-URL>https://gerrit-review.googlesource.com/#/admin/projects/plugins/examples</Implementation-URL>
+
+              <Implementation-Title>Example Validation Listener Assignee</Implementation-Title>
+              <Implementation-Version>${project.version}</Implementation-Version>
+
+              <Gerrit-ApiType>${Gerrit-ApiType}</Gerrit-ApiType>
+              <Gerrit-ApiVersion>${Gerrit-ApiVersion}</Gerrit-ApiVersion>
+            </manifestEntries>
+          </archive>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>2.3.2</version>
+        <configuration>
+          <source>1.8</source>
+          <target>1.8</target>
+          <encoding>UTF-8</encoding>
+        </configuration>
+      </plugin>
+    </plugins>
+
+  </build>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.google.gerrit</groupId>
+      <artifactId>gerrit-${Gerrit-ApiType}-api</artifactId>
+      <version>${Gerrit-ApiVersion}</version>
+      <scope>provided</scope>
+    </dependency>
+  </dependencies>
+
+  <repositories>
+    <repository>
+      <id>maven.org</id>
+      <url>http://repo1.maven.org/maven2</url>
+    </repository>
+  </repositories>
+</project>
diff --git a/example-validationListenerAssignee/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerassignee/AssigneeValidator.java b/example-validationListenerAssignee/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerassignee/AssigneeValidator.java
new file mode 100644
index 0000000..63359ca
--- /dev/null
+++ b/example-validationListenerAssignee/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerassignee/AssigneeValidator.java
@@ -0,0 +1,57 @@
+// Copyright (C) 2014 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.
+
+package com.googlesource.gerrit.plugins.examples.validationlistenerassignee;
+
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.server.query.QueryParseException;
+import com.google.gerrit.server.query.change.ChangeQueryBuilder;
+import com.google.gerrit.server.query.change.ChangeQueryProcessor;
+import com.google.gerrit.server.validators.AssigneeValidationListener;
+import com.google.gerrit.server.validators.ValidationException;
+import com.google.gwtorm.server.OrmException;
+import com.google.inject.Inject;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class AssigneeValidator implements AssigneeValidationListener {
+  private static final Logger log =
+      LoggerFactory.getLogger(AssigneeValidationListener.class);
+
+  private static int MAX_ASSIGNED_CHANGES = 5;
+
+  @Inject
+  ChangeQueryBuilder queryBuilder;
+
+  @Inject
+  ChangeQueryProcessor queryProcessor;
+
+  @Override
+  public void validateAssignee(Change change, Account assignee)
+      throws ValidationException {
+    try {
+      if (queryProcessor
+          .query(queryBuilder.assignee(assignee.getPreferredEmail())).entities()
+          .size() > MAX_ASSIGNED_CHANGES) {
+        throw new ValidationException("Cannot assign user to more than "
+            + MAX_ASSIGNED_CHANGES + " changes");
+      }
+    } catch (OrmException | QueryParseException e) {
+      log.error("Failed to validate assignee for change " + change.getId(), e);
+      // Allow assignee.
+    }
+  }
+}
diff --git a/example-validationListenerAssignee/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerassignee/Module.java b/example-validationListenerAssignee/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerassignee/Module.java
new file mode 100644
index 0000000..05ff04d
--- /dev/null
+++ b/example-validationListenerAssignee/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerassignee/Module.java
@@ -0,0 +1,27 @@
+// Copyright (C) 2013 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.
+
+package com.googlesource.gerrit.plugins.examples.validationlistenerassignee;
+
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.server.validators.AssigneeValidationListener;
+import com.google.inject.AbstractModule;
+
+public class Module extends AbstractModule {
+  @Override
+  protected void configure() {
+    DynamicSet.bind(binder(), AssigneeValidationListener.class)
+        .to(AssigneeValidator.class);
+  }
+}
diff --git a/example-validationListenerAssignee/src/main/resources/Documentation/about.md b/example-validationListenerAssignee/src/main/resources/Documentation/about.md
new file mode 100644
index 0000000..05719a1
--- /dev/null
+++ b/example-validationListenerAssignee/src/main/resources/Documentation/about.md
@@ -0,0 +1 @@
+Sample plugin to demonstrate the validationListenerAssignee feature of Gerrit's plugin API.
diff --git a/example-validationListenerAssignee/tools/bazel.rc b/example-validationListenerAssignee/tools/bazel.rc
new file mode 100644
index 0000000..4ed16cf
--- /dev/null
+++ b/example-validationListenerAssignee/tools/bazel.rc
@@ -0,0 +1,2 @@
+build --workspace_status_command=./tools/workspace-status.sh
+test --build_tests_only
diff --git a/example-validationListenerAssignee/tools/bzl/BUILD b/example-validationListenerAssignee/tools/bzl/BUILD
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/example-validationListenerAssignee/tools/bzl/BUILD
diff --git a/example-validationListenerAssignee/tools/bzl/plugin.bzl b/example-validationListenerAssignee/tools/bzl/plugin.bzl
new file mode 100644
index 0000000..2b1df8c
--- /dev/null
+++ b/example-validationListenerAssignee/tools/bzl/plugin.bzl
@@ -0,0 +1,4 @@
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_plugin.bzl",
+    "gerrit_plugin",
+)
diff --git a/example-validationListenerAssignee/tools/workspace-status.sh b/example-validationListenerAssignee/tools/workspace-status.sh
new file mode 100755
index 0000000..95c851e
--- /dev/null
+++ b/example-validationListenerAssignee/tools/workspace-status.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# This script will be run by bazel when the build process starts to
+# generate key-value information that represents the status of the
+# workspace. The output should be like
+#
+# KEY1 VALUE1
+# KEY2 VALUE2
+#
+# If the script exits with non-zero code, it's considered as a failure
+# and the output will be discarded.
+
+function rev() {
+  git describe --always --match "v[0-9].*" --dirty
+}
+
+echo STABLE_BUILD_EXAMPLE-VALIDATIONLISTENERASSIGNEE_LABEL $(rev)
diff --git a/example-validationListenerCommit/.buckconfig b/example-validationListenerCommit/.buckconfig
new file mode 100644
index 0000000..c3ce4c8
--- /dev/null
+++ b/example-validationListenerCommit/.buckconfig
@@ -0,0 +1,15 @@
+[alias]
+  plugin = //:example-validationListenerCommit
+
+[java]
+  src_roots = java, resources
+  source_level = 8
+  target_level = 8
+
+[project]
+  ignore = .git
+
+[cache]
+  mode = dir
+  dir = buck-out/cache
+
diff --git a/example-validationListenerCommit/.gitignore b/example-validationListenerCommit/.gitignore
new file mode 100644
index 0000000..db1c934
--- /dev/null
+++ b/example-validationListenerCommit/.gitignore
@@ -0,0 +1,8 @@
+/target
+/.classpath
+/.settings
+/.project
+/.buckd
+/buck-cache
+/buck-out
+*.iml
diff --git a/example-validationListenerCommit/BUCK b/example-validationListenerCommit/BUCK
new file mode 100644
index 0000000..e61c849
--- /dev/null
+++ b/example-validationListenerCommit/BUCK
@@ -0,0 +1,18 @@
+include_defs('//bucklets/gerrit_plugin.bucklet')
+
+gerrit_plugin(
+  name = 'example-validationListenerCommit',
+  srcs = glob(['src/main/java/**/*.java']),
+  resources = glob(['src/main/**/*']),
+  manifest_entries = [
+    'Gerrit-PluginName: example-validationListenerCommit',
+    'Gerrit-Module: com.googlesource.gerrit.plugins.examples.validationlistenercommit.Module',
+    'Implementation-Title: Example Validation Listener Commit',
+    'Implementation-URL: https://gerrit-review.googlesource.com/#/admin/projects/plugins/examples',
+  ],
+)
+
+java_library(
+  name = 'classpath',
+  deps = [':example-validationListenerCommit__plugin'],
+)
diff --git a/example-validationListenerCommit/BUILD b/example-validationListenerCommit/BUILD
new file mode 100644
index 0000000..9763959
--- /dev/null
+++ b/example-validationListenerCommit/BUILD
@@ -0,0 +1,12 @@
+load("//tools/bzl:plugin.bzl", "gerrit_plugin")
+
+gerrit_plugin(
+    name = "example-validationListenerCommit",
+    srcs = glob(["src/main/java/**/*.java"]),
+    manifest_entries = [
+        "Gerrit-PluginName: example-validationListenerCommit",
+        "Gerrit-Module: com.googlesource.gerrit.plugins.examples.validationlistenercommit.Module",
+        "Implementation-Title: Example Validation Listener Commit",
+    ],
+    resources = glob(["src/main/resources/**/*"]),
+)
diff --git a/example-validationListenerCommit/LICENSE b/example-validationListenerCommit/LICENSE
new file mode 100644
index 0000000..11069ed
--- /dev/null
+++ b/example-validationListenerCommit/LICENSE
@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
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+   "License" shall mean the terms and conditions for use, reproduction,
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+   the conditions stated in this License.
+
+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
+   by You to the Licensor shall be under the terms and conditions of
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+   the terms of any separate license agreement you may have executed
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+
+6. Trademarks. This License does not grant permission to use the trade
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+7. Disclaimer of Warranty. Unless required by applicable law or
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+   Contributor provides its Contributions) on an "AS IS" BASIS,
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+8. Limitation of Liability. In no event and under no legal theory,
+   whether in tort (including negligence), contract, or otherwise,
+   unless required by applicable law (such as deliberate and grossly
+   negligent acts) or agreed to in writing, shall any Contributor be
+   liable to You for damages, including any direct, indirect, special,
+   incidental, or consequential damages of any character arising as a
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+   Work (including but not limited to damages for loss of goodwill,
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+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work.
+
+   To apply the Apache License to your work, attach the following
+   boilerplate notice, with the fields enclosed by brackets "[]"
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+   file or class name and description of purpose be included on the
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+Copyright [yyyy] [name of copyright owner]
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+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.
diff --git a/example-validationListenerCommit/WORKSPACE b/example-validationListenerCommit/WORKSPACE
new file mode 100644
index 0000000..819a4ac
--- /dev/null
+++ b/example-validationListenerCommit/WORKSPACE
@@ -0,0 +1,26 @@
+workspace(name = "validationListenerCommit")
+
+load("//:bazlets.bzl", "load_bazlets")
+
+load_bazlets(
+    commit = "0f87babe07a555425d829c6e7951e296e9e24579",
+    #    local_path = "/home/<user>/projects/bazlets",
+)
+
+# Release Plugin API
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_api.bzl",
+    "gerrit_api",
+)
+
+# Snapshot Plugin API
+#load(
+#    "@com_googlesource_gerrit_bazlets//:gerrit_api_maven_local.bzl",
+#    "gerrit_api_maven_local",
+#)
+
+# Load release Plugin API
+gerrit_api()
+
+# Load snapshot Plugin API
+#gerrit_api_maven_local()
diff --git a/example-validationListenerCommit/bazlets.bzl b/example-validationListenerCommit/bazlets.bzl
new file mode 100644
index 0000000..e14e488
--- /dev/null
+++ b/example-validationListenerCommit/bazlets.bzl
@@ -0,0 +1,17 @@
+NAME = "com_googlesource_gerrit_bazlets"
+
+def load_bazlets(
+    commit,
+    local_path = None
+  ):
+  if not local_path:
+      native.git_repository(
+          name = NAME,
+          remote = "https://gerrit.googlesource.com/bazlets",
+          commit = commit,
+      )
+  else:
+      native.local_repository(
+          name = NAME,
+          path = local_path,
+      )
diff --git a/example-validationListenerCommit/lib/gerrit/BUCK b/example-validationListenerCommit/lib/gerrit/BUCK
new file mode 100644
index 0000000..8d5f0e9
--- /dev/null
+++ b/example-validationListenerCommit/lib/gerrit/BUCK
@@ -0,0 +1,20 @@
+include_defs('//bucklets/maven_jar.bucklet')
+
+VER = '2.14-SNAPSHOT'
+REPO = MAVEN_LOCAL
+
+maven_jar(
+  name = 'acceptance-framework',
+  id = 'com.google.gerrit:gerrit-acceptance-framework:' + VER,
+  license = 'Apache2.0',
+  attach_source = False,
+  repository = REPO,
+)
+
+maven_jar(
+  name = 'plugin-api',
+  id = 'com.google.gerrit:gerrit-plugin-api:' + VER,
+  license = 'Apache2.0',
+  attach_source = False,
+  repository = REPO,
+)
diff --git a/example-validationListenerCommit/pom.xml b/example-validationListenerCommit/pom.xml
new file mode 100644
index 0000000..1d0785e
--- /dev/null
+++ b/example-validationListenerCommit/pom.xml
@@ -0,0 +1,85 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+Copyright (C) 2013 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.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>com.googlesource.gerrit.plugins</groupId>
+  <artifactId>example-validationListenerCommit</artifactId>
+  <packaging>jar</packaging>
+  <version>2.14-SNAPSHOT</version>
+  <properties>
+    <Gerrit-ApiType>plugin</Gerrit-ApiType>
+    <Gerrit-ApiVersion>${project.version}</Gerrit-ApiVersion>
+  </properties>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>2.4</version>
+        <configuration>
+          <archive>
+            <manifestEntries>
+              <Gerrit-PluginName>example-validationListenerCommit</Gerrit-PluginName>
+              <Gerrit-Module>com.googlesource.gerrit.plugins.examples.validationlistenercommit.Module</Gerrit-Module>
+
+              <Implementation-Vendor>Gerrit Code Review</Implementation-Vendor>
+              <Implementation-URL>https://gerrit-review.googlesource.com/#/admin/projects/plugins/examples</Implementation-URL>
+
+              <Implementation-Title>Example Validation Listener Commit</Implementation-Title>
+              <Implementation-Version>${project.version}</Implementation-Version>
+
+              <Gerrit-ApiType>${Gerrit-ApiType}</Gerrit-ApiType>
+              <Gerrit-ApiVersion>${Gerrit-ApiVersion}</Gerrit-ApiVersion>
+            </manifestEntries>
+          </archive>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>2.3.2</version>
+        <configuration>
+          <source>1.8</source>
+          <target>1.8</target>
+          <encoding>UTF-8</encoding>
+        </configuration>
+      </plugin>
+    </plugins>
+
+  </build>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.google.gerrit</groupId>
+      <artifactId>gerrit-${Gerrit-ApiType}-api</artifactId>
+      <version>${Gerrit-ApiVersion}</version>
+      <scope>provided</scope>
+    </dependency>
+  </dependencies>
+
+  <repositories>
+    <repository>
+      <id>maven.org</id>
+      <url>http://repo1.maven.org/maven2</url>
+    </repository>
+  </repositories>
+</project>
diff --git a/example-validationListenerCommit/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenercommit/CommitValidator.java b/example-validationListenerCommit/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenercommit/CommitValidator.java
new file mode 100644
index 0000000..70bca21
--- /dev/null
+++ b/example-validationListenerCommit/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenercommit/CommitValidator.java
@@ -0,0 +1,38 @@
+// 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.
+
+package com.googlesource.gerrit.plugins.examples.validationlistenercommit;
+
+import com.google.common.collect.ImmutableList;
+import com.google.gerrit.server.events.CommitReceivedEvent;
+import com.google.gerrit.server.git.validators.CommitValidationException;
+import com.google.gerrit.server.git.validators.CommitValidationListener;
+import com.google.gerrit.server.git.validators.CommitValidationMessage;
+
+import java.util.List;
+
+public class CommitValidator implements CommitValidationListener {
+  @Override
+  public List<CommitValidationMessage> onCommitReceived(
+      CommitReceivedEvent receiveEvent) throws CommitValidationException {
+    if ("plugins/example-validationListenerCommit".equals(receiveEvent.project.getName()) &&
+        !receiveEvent.commit.getShortMessage().startsWith("Cookbook: ")) {
+      CommitValidationMessage m = new CommitValidationMessage(
+          "Subject should begin with 'Cookbook: '", true);
+      throw new CommitValidationException(
+          "Invalid commit message", ImmutableList.of(m));
+    }
+    return ImmutableList.of();
+  }
+}
diff --git a/example-validationListenerCommit/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenercommit/Module.java b/example-validationListenerCommit/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenercommit/Module.java
new file mode 100644
index 0000000..db39957
--- /dev/null
+++ b/example-validationListenerCommit/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenercommit/Module.java
@@ -0,0 +1,27 @@
+// Copyright (C) 2013 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.
+
+package com.googlesource.gerrit.plugins.examples.validationlistenercommit;
+
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.server.git.validators.CommitValidationListener;
+import com.google.inject.AbstractModule;
+
+public class Module extends AbstractModule {
+  @Override
+  protected void configure() {
+    DynamicSet.bind(binder(), CommitValidationListener.class)
+        .to(CommitValidator.class);
+  }
+}
diff --git a/example-validationListenerCommit/src/main/resources/Documentation/about.md b/example-validationListenerCommit/src/main/resources/Documentation/about.md
new file mode 100644
index 0000000..f0fcc33
--- /dev/null
+++ b/example-validationListenerCommit/src/main/resources/Documentation/about.md
@@ -0,0 +1 @@
+Sample plugin to demonstrate the validationListenerCommit feature of Gerrit's plugin API.
diff --git a/example-validationListenerCommit/tools/bazel.rc b/example-validationListenerCommit/tools/bazel.rc
new file mode 100644
index 0000000..4ed16cf
--- /dev/null
+++ b/example-validationListenerCommit/tools/bazel.rc
@@ -0,0 +1,2 @@
+build --workspace_status_command=./tools/workspace-status.sh
+test --build_tests_only
diff --git a/example-validationListenerCommit/tools/bzl/BUILD b/example-validationListenerCommit/tools/bzl/BUILD
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/example-validationListenerCommit/tools/bzl/BUILD
diff --git a/example-validationListenerCommit/tools/bzl/plugin.bzl b/example-validationListenerCommit/tools/bzl/plugin.bzl
new file mode 100644
index 0000000..2b1df8c
--- /dev/null
+++ b/example-validationListenerCommit/tools/bzl/plugin.bzl
@@ -0,0 +1,4 @@
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_plugin.bzl",
+    "gerrit_plugin",
+)
diff --git a/example-validationListenerCommit/tools/workspace-status.sh b/example-validationListenerCommit/tools/workspace-status.sh
new file mode 100755
index 0000000..5488fc6
--- /dev/null
+++ b/example-validationListenerCommit/tools/workspace-status.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# This script will be run by bazel when the build process starts to
+# generate key-value information that represents the status of the
+# workspace. The output should be like
+#
+# KEY1 VALUE1
+# KEY2 VALUE2
+#
+# If the script exits with non-zero code, it's considered as a failure
+# and the output will be discarded.
+
+function rev() {
+  git describe --always --match "v[0-9].*" --dirty
+}
+
+echo STABLE_BUILD_EXAMPLE-VALIDATIONLISTENERCOMMIT_LABEL $(rev)
diff --git a/example-validationListenerHashtag/.buckconfig b/example-validationListenerHashtag/.buckconfig
new file mode 100644
index 0000000..4ef2069
--- /dev/null
+++ b/example-validationListenerHashtag/.buckconfig
@@ -0,0 +1,15 @@
+[alias]
+  plugin = //:example-validationListenerHashtag
+
+[java]
+  src_roots = java, resources
+  source_level = 8
+  target_level = 8
+
+[project]
+  ignore = .git
+
+[cache]
+  mode = dir
+  dir = buck-out/cache
+
diff --git a/example-validationListenerHashtag/.gitignore b/example-validationListenerHashtag/.gitignore
new file mode 100644
index 0000000..db1c934
--- /dev/null
+++ b/example-validationListenerHashtag/.gitignore
@@ -0,0 +1,8 @@
+/target
+/.classpath
+/.settings
+/.project
+/.buckd
+/buck-cache
+/buck-out
+*.iml
diff --git a/example-validationListenerHashtag/BUCK b/example-validationListenerHashtag/BUCK
new file mode 100644
index 0000000..0c76c5a
--- /dev/null
+++ b/example-validationListenerHashtag/BUCK
@@ -0,0 +1,18 @@
+include_defs('//bucklets/gerrit_plugin.bucklet')
+
+gerrit_plugin(
+  name = 'example-validationListenerHashtag',
+  srcs = glob(['src/main/java/**/*.java']),
+  resources = glob(['src/main/**/*']),
+  manifest_entries = [
+    'Gerrit-PluginName: example-validationListenerHashtag',
+    'Gerrit-Module: com.googlesource.gerrit.plugins.examples.validationlistenerhashtag.Module',
+    'Implementation-Title: Example Validation Listener Hashtag',
+    'Implementation-URL: https://gerrit-review.googlesource.com/#/admin/projects/plugins/examples',
+  ],
+)
+
+java_library(
+  name = 'classpath',
+  deps = [':example-validationListenerHashtag__plugin'],
+)
diff --git a/example-validationListenerHashtag/BUILD b/example-validationListenerHashtag/BUILD
new file mode 100644
index 0000000..3000268
--- /dev/null
+++ b/example-validationListenerHashtag/BUILD
@@ -0,0 +1,12 @@
+load("//tools/bzl:plugin.bzl", "gerrit_plugin")
+
+gerrit_plugin(
+    name = "example-validationListenerHashtag",
+    srcs = glob(["src/main/java/**/*.java"]),
+    manifest_entries = [
+        "Gerrit-PluginName: example-validationListenerHashtag",
+        "Gerrit-Module: com.googlesource.gerrit.plugins.examples.validationlistenerhashtag.Module",
+        "Implementation-Title: Example Validation Listener Hashtag",
+    ],
+    resources = glob(["src/main/resources/**/*"]),
+)
diff --git a/example-validationListenerHashtag/LICENSE b/example-validationListenerHashtag/LICENSE
new file mode 100644
index 0000000..11069ed
--- /dev/null
+++ b/example-validationListenerHashtag/LICENSE
@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
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+5. Submission of Contributions. Unless You explicitly state otherwise,
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+6. Trademarks. This License does not grant permission to use the trade
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+   Contributor provides its Contributions) on an "AS IS" BASIS,
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+   whether in tort (including negligence), contract, or otherwise,
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+   negligent acts) or agreed to in writing, shall any Contributor be
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+APPENDIX: How to apply the Apache License to your work.
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+   To apply the Apache License to your work, attach the following
+   boilerplate notice, with the fields enclosed by brackets "[]"
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+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
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diff --git a/example-validationListenerHashtag/WORKSPACE b/example-validationListenerHashtag/WORKSPACE
new file mode 100644
index 0000000..8a5d367
--- /dev/null
+++ b/example-validationListenerHashtag/WORKSPACE
@@ -0,0 +1,26 @@
+workspace(name = "validationListenerHashtag")
+
+load("//:bazlets.bzl", "load_bazlets")
+
+load_bazlets(
+    commit = "0f87babe07a555425d829c6e7951e296e9e24579",
+    #    local_path = "/home/<user>/projects/bazlets",
+)
+
+# Release Plugin API
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_api.bzl",
+    "gerrit_api",
+)
+
+# Snapshot Plugin API
+#load(
+#    "@com_googlesource_gerrit_bazlets//:gerrit_api_maven_local.bzl",
+#    "gerrit_api_maven_local",
+#)
+
+# Load release Plugin API
+gerrit_api()
+
+# Load snapshot Plugin API
+#gerrit_api_maven_local()
diff --git a/example-validationListenerHashtag/bazlets.bzl b/example-validationListenerHashtag/bazlets.bzl
new file mode 100644
index 0000000..e14e488
--- /dev/null
+++ b/example-validationListenerHashtag/bazlets.bzl
@@ -0,0 +1,17 @@
+NAME = "com_googlesource_gerrit_bazlets"
+
+def load_bazlets(
+    commit,
+    local_path = None
+  ):
+  if not local_path:
+      native.git_repository(
+          name = NAME,
+          remote = "https://gerrit.googlesource.com/bazlets",
+          commit = commit,
+      )
+  else:
+      native.local_repository(
+          name = NAME,
+          path = local_path,
+      )
diff --git a/example-validationListenerHashtag/lib/gerrit/BUCK b/example-validationListenerHashtag/lib/gerrit/BUCK
new file mode 100644
index 0000000..8d5f0e9
--- /dev/null
+++ b/example-validationListenerHashtag/lib/gerrit/BUCK
@@ -0,0 +1,20 @@
+include_defs('//bucklets/maven_jar.bucklet')
+
+VER = '2.14-SNAPSHOT'
+REPO = MAVEN_LOCAL
+
+maven_jar(
+  name = 'acceptance-framework',
+  id = 'com.google.gerrit:gerrit-acceptance-framework:' + VER,
+  license = 'Apache2.0',
+  attach_source = False,
+  repository = REPO,
+)
+
+maven_jar(
+  name = 'plugin-api',
+  id = 'com.google.gerrit:gerrit-plugin-api:' + VER,
+  license = 'Apache2.0',
+  attach_source = False,
+  repository = REPO,
+)
diff --git a/example-validationListenerHashtag/pom.xml b/example-validationListenerHashtag/pom.xml
new file mode 100644
index 0000000..7965f8d
--- /dev/null
+++ b/example-validationListenerHashtag/pom.xml
@@ -0,0 +1,85 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+Copyright (C) 2013 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.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>com.googlesource.gerrit.plugins</groupId>
+  <artifactId>example-validationListenerHashtag</artifactId>
+  <packaging>jar</packaging>
+  <version>2.14-SNAPSHOT</version>
+  <properties>
+    <Gerrit-ApiType>plugin</Gerrit-ApiType>
+    <Gerrit-ApiVersion>${project.version}</Gerrit-ApiVersion>
+  </properties>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>2.4</version>
+        <configuration>
+          <archive>
+            <manifestEntries>
+              <Gerrit-PluginName>example-validationListenerHashtag</Gerrit-PluginName>
+              <Gerrit-Module>com.googlesource.gerrit.plugins.examples.validationlistenerhashtag.Module</Gerrit-Module>
+
+              <Implementation-Vendor>Gerrit Code Review</Implementation-Vendor>
+              <Implementation-URL>https://gerrit-review.googlesource.com/#/admin/projects/plugins/examples</Implementation-URL>
+
+              <Implementation-Title>Example Validation Listener Hashtag</Implementation-Title>
+              <Implementation-Version>${project.version}</Implementation-Version>
+
+              <Gerrit-ApiType>${Gerrit-ApiType}</Gerrit-ApiType>
+              <Gerrit-ApiVersion>${Gerrit-ApiVersion}</Gerrit-ApiVersion>
+            </manifestEntries>
+          </archive>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>2.3.2</version>
+        <configuration>
+          <source>1.8</source>
+          <target>1.8</target>
+          <encoding>UTF-8</encoding>
+        </configuration>
+      </plugin>
+    </plugins>
+
+  </build>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.google.gerrit</groupId>
+      <artifactId>gerrit-${Gerrit-ApiType}-api</artifactId>
+      <version>${Gerrit-ApiVersion}</version>
+      <scope>provided</scope>
+    </dependency>
+  </dependencies>
+
+  <repositories>
+    <repository>
+      <id>maven.org</id>
+      <url>http://repo1.maven.org/maven2</url>
+    </repository>
+  </repositories>
+</project>
diff --git a/example-validationListenerHashtag/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerhashtag/HashtagValidator.java b/example-validationListenerHashtag/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerhashtag/HashtagValidator.java
new file mode 100644
index 0000000..02e149e
--- /dev/null
+++ b/example-validationListenerHashtag/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerhashtag/HashtagValidator.java
@@ -0,0 +1,42 @@
+// Copyright (C) 2014 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.
+
+package com.googlesource.gerrit.plugins.examples.validationlistenerhashtag;
+
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.server.validators.HashtagValidationListener;
+import com.google.gerrit.server.validators.ValidationException;
+
+import java.util.Set;
+
+public class HashtagValidator implements HashtagValidationListener {
+
+  @Override
+  public void validateHashtags(Change change, Set<String> toAdd, Set<String> toRemove)
+      throws ValidationException {
+    if (change.getProject().get().equals("plugins/example-validationListenerHashtag")) {
+      if (toAdd.size() > 0) {
+        for (String hashtag : toAdd) {
+          if (!hashtag.startsWith("example-validationListenerHashtag-")) {
+            throw new ValidationException("Invalid example-validationListenerHashtag hashtag: " + hashtag);
+          }
+        }
+      }
+
+      if (toRemove.size() > 0) {
+        throw new ValidationException("Cannot remove example-validationListenerHashtag hashtags");
+      }
+    }
+  }
+}
diff --git a/example-validationListenerHashtag/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerhashtag/Module.java b/example-validationListenerHashtag/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerhashtag/Module.java
new file mode 100644
index 0000000..43c4426
--- /dev/null
+++ b/example-validationListenerHashtag/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerhashtag/Module.java
@@ -0,0 +1,27 @@
+// Copyright (C) 2013 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.
+
+package com.googlesource.gerrit.plugins.examples.validationlistenerhashtag;
+
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.server.validators.HashtagValidationListener;
+import com.google.inject.AbstractModule;
+
+public class Module extends AbstractModule {
+  @Override
+  protected void configure() {
+    DynamicSet.bind(binder(), HashtagValidationListener.class)
+        .to(HashtagValidator.class);
+  }
+}
diff --git a/example-validationListenerHashtag/src/main/resources/Documentation/about.md b/example-validationListenerHashtag/src/main/resources/Documentation/about.md
new file mode 100644
index 0000000..f5c1bef
--- /dev/null
+++ b/example-validationListenerHashtag/src/main/resources/Documentation/about.md
@@ -0,0 +1 @@
+Sample plugin to demonstrate the validationListenerHashtag feature of Gerrit's plugin API.
diff --git a/example-validationListenerHashtag/tools/bazel.rc b/example-validationListenerHashtag/tools/bazel.rc
new file mode 100644
index 0000000..4ed16cf
--- /dev/null
+++ b/example-validationListenerHashtag/tools/bazel.rc
@@ -0,0 +1,2 @@
+build --workspace_status_command=./tools/workspace-status.sh
+test --build_tests_only
diff --git a/example-validationListenerHashtag/tools/bzl/BUILD b/example-validationListenerHashtag/tools/bzl/BUILD
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/example-validationListenerHashtag/tools/bzl/BUILD
diff --git a/example-validationListenerHashtag/tools/bzl/plugin.bzl b/example-validationListenerHashtag/tools/bzl/plugin.bzl
new file mode 100644
index 0000000..2b1df8c
--- /dev/null
+++ b/example-validationListenerHashtag/tools/bzl/plugin.bzl
@@ -0,0 +1,4 @@
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_plugin.bzl",
+    "gerrit_plugin",
+)
diff --git a/example-validationListenerHashtag/tools/workspace-status.sh b/example-validationListenerHashtag/tools/workspace-status.sh
new file mode 100755
index 0000000..0f2d3fe
--- /dev/null
+++ b/example-validationListenerHashtag/tools/workspace-status.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# This script will be run by bazel when the build process starts to
+# generate key-value information that represents the status of the
+# workspace. The output should be like
+#
+# KEY1 VALUE1
+# KEY2 VALUE2
+#
+# If the script exits with non-zero code, it's considered as a failure
+# and the output will be discarded.
+
+function rev() {
+  git describe --always --match "v[0-9].*" --dirty
+}
+
+echo STABLE_BUILD_EXAMPLE-VALIDATIONLISTENERHASHTAG_LABEL $(rev)
diff --git a/example-validationListenerMerge/.buckconfig b/example-validationListenerMerge/.buckconfig
new file mode 100644
index 0000000..22eee3f
--- /dev/null
+++ b/example-validationListenerMerge/.buckconfig
@@ -0,0 +1,15 @@
+[alias]
+  plugin = //:example-validationListenerMerge
+
+[java]
+  src_roots = java, resources
+  source_level = 8
+  target_level = 8
+
+[project]
+  ignore = .git
+
+[cache]
+  mode = dir
+  dir = buck-out/cache
+
diff --git a/example-validationListenerMerge/.gitignore b/example-validationListenerMerge/.gitignore
new file mode 100644
index 0000000..db1c934
--- /dev/null
+++ b/example-validationListenerMerge/.gitignore
@@ -0,0 +1,8 @@
+/target
+/.classpath
+/.settings
+/.project
+/.buckd
+/buck-cache
+/buck-out
+*.iml
diff --git a/example-validationListenerMerge/BUCK b/example-validationListenerMerge/BUCK
new file mode 100644
index 0000000..49d3948
--- /dev/null
+++ b/example-validationListenerMerge/BUCK
@@ -0,0 +1,18 @@
+include_defs('//bucklets/gerrit_plugin.bucklet')
+
+gerrit_plugin(
+  name = 'example-validationListenerMerge',
+  srcs = glob(['src/main/java/**/*.java']),
+  resources = glob(['src/main/**/*']),
+  manifest_entries = [
+    'Gerrit-PluginName: example-validationListenerMerge',
+    'Gerrit-Module: com.googlesource.gerrit.plugins.examples.validationlistenermerge.Module',
+    'Implementation-Title: Example Validation Listener Merge',
+    'Implementation-URL: https://gerrit-review.googlesource.com/#/admin/projects/plugins/examples',
+  ],
+)
+
+java_library(
+  name = 'classpath',
+  deps = [':example-validationListenerMerge__plugin'],
+)
diff --git a/example-validationListenerMerge/BUILD b/example-validationListenerMerge/BUILD
new file mode 100644
index 0000000..edf26e9
--- /dev/null
+++ b/example-validationListenerMerge/BUILD
@@ -0,0 +1,12 @@
+load("//tools/bzl:plugin.bzl", "gerrit_plugin")
+
+gerrit_plugin(
+    name = "example-validationListenerMerge",
+    srcs = glob(["src/main/java/**/*.java"]),
+    manifest_entries = [
+        "Gerrit-PluginName: example-validationListenerMerge",
+        "Gerrit-Module: com.googlesource.gerrit.plugins.examples.validationlistenermerge.Module",
+        "Implementation-Title: Example Validation Listener Merge",
+    ],
+    resources = glob(["src/main/resources/**/*"]),
+)
diff --git a/example-validationListenerMerge/LICENSE b/example-validationListenerMerge/LICENSE
new file mode 100644
index 0000000..11069ed
--- /dev/null
+++ b/example-validationListenerMerge/LICENSE
@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+   "You" (or "Your") shall mean an individual or Legal Entity
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+
+Unless required by applicable law or agreed to in writing, software
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+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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diff --git a/example-validationListenerMerge/WORKSPACE b/example-validationListenerMerge/WORKSPACE
new file mode 100644
index 0000000..27f6664
--- /dev/null
+++ b/example-validationListenerMerge/WORKSPACE
@@ -0,0 +1,26 @@
+workspace(name = "validationListenerMerge")
+
+load("//:bazlets.bzl", "load_bazlets")
+
+load_bazlets(
+    commit = "0f87babe07a555425d829c6e7951e296e9e24579",
+    #    local_path = "/home/<user>/projects/bazlets",
+)
+
+# Release Plugin API
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_api.bzl",
+    "gerrit_api",
+)
+
+# Snapshot Plugin API
+#load(
+#    "@com_googlesource_gerrit_bazlets//:gerrit_api_maven_local.bzl",
+#    "gerrit_api_maven_local",
+#)
+
+# Load release Plugin API
+gerrit_api()
+
+# Load snapshot Plugin API
+#gerrit_api_maven_local()
diff --git a/example-validationListenerMerge/bazlets.bzl b/example-validationListenerMerge/bazlets.bzl
new file mode 100644
index 0000000..e14e488
--- /dev/null
+++ b/example-validationListenerMerge/bazlets.bzl
@@ -0,0 +1,17 @@
+NAME = "com_googlesource_gerrit_bazlets"
+
+def load_bazlets(
+    commit,
+    local_path = None
+  ):
+  if not local_path:
+      native.git_repository(
+          name = NAME,
+          remote = "https://gerrit.googlesource.com/bazlets",
+          commit = commit,
+      )
+  else:
+      native.local_repository(
+          name = NAME,
+          path = local_path,
+      )
diff --git a/example-validationListenerMerge/lib/gerrit/BUCK b/example-validationListenerMerge/lib/gerrit/BUCK
new file mode 100644
index 0000000..8d5f0e9
--- /dev/null
+++ b/example-validationListenerMerge/lib/gerrit/BUCK
@@ -0,0 +1,20 @@
+include_defs('//bucklets/maven_jar.bucklet')
+
+VER = '2.14-SNAPSHOT'
+REPO = MAVEN_LOCAL
+
+maven_jar(
+  name = 'acceptance-framework',
+  id = 'com.google.gerrit:gerrit-acceptance-framework:' + VER,
+  license = 'Apache2.0',
+  attach_source = False,
+  repository = REPO,
+)
+
+maven_jar(
+  name = 'plugin-api',
+  id = 'com.google.gerrit:gerrit-plugin-api:' + VER,
+  license = 'Apache2.0',
+  attach_source = False,
+  repository = REPO,
+)
diff --git a/example-validationListenerMerge/pom.xml b/example-validationListenerMerge/pom.xml
new file mode 100644
index 0000000..fce9a56
--- /dev/null
+++ b/example-validationListenerMerge/pom.xml
@@ -0,0 +1,85 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+Copyright (C) 2013 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.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>com.googlesource.gerrit.plugins</groupId>
+  <artifactId>example-validationListenerMerge</artifactId>
+  <packaging>jar</packaging>
+  <version>2.14-SNAPSHOT</version>
+  <properties>
+    <Gerrit-ApiType>plugin</Gerrit-ApiType>
+    <Gerrit-ApiVersion>${project.version}</Gerrit-ApiVersion>
+  </properties>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>2.4</version>
+        <configuration>
+          <archive>
+            <manifestEntries>
+              <Gerrit-PluginName>example-validationListenerMerge</Gerrit-PluginName>
+              <Gerrit-Module>com.googlesource.gerrit.plugins.examples.validationlistenermerge.Module</Gerrit-Module>
+
+              <Implementation-Vendor>Gerrit Code Review</Implementation-Vendor>
+              <Implementation-URL>https://gerrit-review.googlesource.com/#/admin/projects/plugins/examples</Implementation-URL>
+
+              <Implementation-Title>Example Validation Listener Merge</Implementation-Title>
+              <Implementation-Version>${project.version}</Implementation-Version>
+
+              <Gerrit-ApiType>${Gerrit-ApiType}</Gerrit-ApiType>
+              <Gerrit-ApiVersion>${Gerrit-ApiVersion}</Gerrit-ApiVersion>
+            </manifestEntries>
+          </archive>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>2.3.2</version>
+        <configuration>
+          <source>1.8</source>
+          <target>1.8</target>
+          <encoding>UTF-8</encoding>
+        </configuration>
+      </plugin>
+    </plugins>
+
+  </build>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.google.gerrit</groupId>
+      <artifactId>gerrit-${Gerrit-ApiType}-api</artifactId>
+      <version>${Gerrit-ApiVersion}</version>
+      <scope>provided</scope>
+    </dependency>
+  </dependencies>
+
+  <repositories>
+    <repository>
+      <id>maven.org</id>
+      <url>http://repo1.maven.org/maven2</url>
+    </repository>
+  </repositories>
+</project>
diff --git a/example-validationListenerMerge/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenermerge/MergeUserValidator.java b/example-validationListenerMerge/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenermerge/MergeUserValidator.java
new file mode 100644
index 0000000..d8cbf98
--- /dev/null
+++ b/example-validationListenerMerge/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenermerge/MergeUserValidator.java
@@ -0,0 +1,49 @@
+// Copyright (C) 2014 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.
+
+package com.googlesource.gerrit.plugins.examples.validationlistenermerge;
+
+import com.google.gerrit.reviewdb.client.Branch;
+import com.google.gerrit.reviewdb.client.PatchSet;
+import com.google.gerrit.server.IdentifiedUser;
+import com.google.gerrit.server.git.CodeReviewCommit;
+import com.google.gerrit.server.git.validators.MergeValidationException;
+import com.google.gerrit.server.git.validators.MergeValidationListener;
+import com.google.gerrit.server.project.ProjectState;
+import com.google.inject.Singleton;
+
+import org.eclipse.jgit.lib.Repository;
+
+// Because we have a dedicated Module, we need to bind to the set
+// there, however, if you are using this as a base for your own
+// plugin, you can simply comment out the 'Listen' annotation and
+// it will work as expected.
+//@Listen
+@Singleton
+public class MergeUserValidator implements MergeValidationListener {
+
+  /**
+   * Reject all merges if the submitter is not an administrator
+   */
+  @Override
+  public void onPreMerge(Repository repo, CodeReviewCommit commit,
+      ProjectState destProject, Branch.NameKey destBranch,
+      PatchSet.Id patchSetId, IdentifiedUser caller)
+          throws MergeValidationException {
+    if (!caller.getCapabilities().canAdministrateServer()) {
+      throw new MergeValidationException("Submitter " + caller.getNameEmail()
+          + " is not a site administrator");
+    }
+  }
+}
diff --git a/example-validationListenerMerge/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenermerge/Module.java b/example-validationListenerMerge/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenermerge/Module.java
new file mode 100644
index 0000000..dde757c
--- /dev/null
+++ b/example-validationListenerMerge/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenermerge/Module.java
@@ -0,0 +1,27 @@
+// Copyright (C) 2013 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.
+
+package com.googlesource.gerrit.plugins.examples.validationlistenermerge;
+
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.server.git.validators.MergeValidationListener;
+import com.google.inject.AbstractModule;
+
+public class Module extends AbstractModule {
+  @Override
+  protected void configure() {
+    DynamicSet.bind(binder(), MergeValidationListener.class)
+        .to(MergeUserValidator.class);
+  }
+}
diff --git a/example-validationListenerMerge/src/main/resources/Documentation/about.md b/example-validationListenerMerge/src/main/resources/Documentation/about.md
new file mode 100644
index 0000000..7e66f71
--- /dev/null
+++ b/example-validationListenerMerge/src/main/resources/Documentation/about.md
@@ -0,0 +1 @@
+Sample plugin to demonstrate the validationListenerMerge feature of Gerrit's plugin API.
diff --git a/example-validationListenerMerge/tools/bazel.rc b/example-validationListenerMerge/tools/bazel.rc
new file mode 100644
index 0000000..4ed16cf
--- /dev/null
+++ b/example-validationListenerMerge/tools/bazel.rc
@@ -0,0 +1,2 @@
+build --workspace_status_command=./tools/workspace-status.sh
+test --build_tests_only
diff --git a/example-validationListenerMerge/tools/bzl/BUILD b/example-validationListenerMerge/tools/bzl/BUILD
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/example-validationListenerMerge/tools/bzl/BUILD
diff --git a/example-validationListenerMerge/tools/bzl/plugin.bzl b/example-validationListenerMerge/tools/bzl/plugin.bzl
new file mode 100644
index 0000000..2b1df8c
--- /dev/null
+++ b/example-validationListenerMerge/tools/bzl/plugin.bzl
@@ -0,0 +1,4 @@
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_plugin.bzl",
+    "gerrit_plugin",
+)
diff --git a/example-validationListenerMerge/tools/workspace-status.sh b/example-validationListenerMerge/tools/workspace-status.sh
new file mode 100755
index 0000000..6928ad0
--- /dev/null
+++ b/example-validationListenerMerge/tools/workspace-status.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# This script will be run by bazel when the build process starts to
+# generate key-value information that represents the status of the
+# workspace. The output should be like
+#
+# KEY1 VALUE1
+# KEY2 VALUE2
+#
+# If the script exits with non-zero code, it's considered as a failure
+# and the output will be discarded.
+
+function rev() {
+  git describe --always --match "v[0-9].*" --dirty
+}
+
+echo STABLE_BUILD_EXAMPLE-VALIDATIONLISTENERMERGE_LABEL $(rev)
diff --git a/example-validationListenerNewProjectCreated/.buckconfig b/example-validationListenerNewProjectCreated/.buckconfig
new file mode 100644
index 0000000..0df5541
--- /dev/null
+++ b/example-validationListenerNewProjectCreated/.buckconfig
@@ -0,0 +1,15 @@
+[alias]
+  plugin = //:example-validationListenerNewProjectCreated
+
+[java]
+  src_roots = java, resources
+  source_level = 8
+  target_level = 8
+
+[project]
+  ignore = .git
+
+[cache]
+  mode = dir
+  dir = buck-out/cache
+
diff --git a/example-validationListenerNewProjectCreated/.gitignore b/example-validationListenerNewProjectCreated/.gitignore
new file mode 100644
index 0000000..db1c934
--- /dev/null
+++ b/example-validationListenerNewProjectCreated/.gitignore
@@ -0,0 +1,8 @@
+/target
+/.classpath
+/.settings
+/.project
+/.buckd
+/buck-cache
+/buck-out
+*.iml
diff --git a/example-validationListenerNewProjectCreated/BUCK b/example-validationListenerNewProjectCreated/BUCK
new file mode 100644
index 0000000..54a2277
--- /dev/null
+++ b/example-validationListenerNewProjectCreated/BUCK
@@ -0,0 +1,18 @@
+include_defs('//bucklets/gerrit_plugin.bucklet')
+
+gerrit_plugin(
+  name = 'example-validationListenerNewProjectCreated',
+  srcs = glob(['src/main/java/**/*.java']),
+  resources = glob(['src/main/**/*']),
+  manifest_entries = [
+    'Gerrit-PluginName: example-validationListenerNewProjectCreated',
+    'Gerrit-Module: com.googlesource.gerrit.plugins.examples.validationlistenernewprojectcreated.Module',
+    'Implementation-Title: Example Validation Listener NewProjectCreated',
+    'Implementation-URL: https://gerrit-review.googlesource.com/#/admin/projects/plugins/examples',
+  ],
+)
+
+java_library(
+  name = 'classpath',
+  deps = [':example-validationListenerNewProjectCreated__plugin'],
+)
diff --git a/example-validationListenerNewProjectCreated/BUILD b/example-validationListenerNewProjectCreated/BUILD
new file mode 100644
index 0000000..25d09c1
--- /dev/null
+++ b/example-validationListenerNewProjectCreated/BUILD
@@ -0,0 +1,12 @@
+load("//tools/bzl:plugin.bzl", "gerrit_plugin")
+
+gerrit_plugin(
+    name = "example-validationListenerNewProjectCreated",
+    srcs = glob(["src/main/java/**/*.java"]),
+    manifest_entries = [
+        "Gerrit-PluginName: example-validationListenerNewProjectCreated",
+        "Gerrit-Module: com.googlesource.gerrit.plugins.examples.validationlistenernewprojectcreated.Module",
+        "Implementation-Title: Example Validation Listener New Project Created",
+    ],
+    resources = glob(["src/main/resources/**/*"]),
+)
diff --git a/example-validationListenerNewProjectCreated/LICENSE b/example-validationListenerNewProjectCreated/LICENSE
new file mode 100644
index 0000000..11069ed
--- /dev/null
+++ b/example-validationListenerNewProjectCreated/LICENSE
@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+   "License" shall mean the terms and conditions for use, reproduction,
+   and distribution as defined by Sections 1 through 9 of this document.
+
+   "Licensor" shall mean the copyright owner or entity authorized by
+   the copyright owner that is granting the License.
+
+   "Legal Entity" shall mean the union of the acting entity and all
+   other entities that control, are controlled by, or are under common
+   control with that entity. For the purposes of this definition,
+   "control" means (i) the power, direct or indirect, to cause the
+   direction or management of such entity, whether by contract or
+   otherwise, or (ii) ownership of fifty percent (50%) or more of the
+   outstanding shares, or (iii) beneficial ownership of such entity.
+
+   "You" (or "Your") shall mean an individual or Legal Entity
+   exercising permissions granted by this License.
+
+   "Source" form shall mean the preferred form for making modifications,
+   including but not limited to software source code, documentation
+   source, and configuration files.
+
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+APPENDIX: How to apply the Apache License to your work.
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+Copyright [yyyy] [name of copyright owner]
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+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
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+
+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.
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diff --git a/example-validationListenerNewProjectCreated/WORKSPACE b/example-validationListenerNewProjectCreated/WORKSPACE
new file mode 100644
index 0000000..16abbe5
--- /dev/null
+++ b/example-validationListenerNewProjectCreated/WORKSPACE
@@ -0,0 +1,26 @@
+workspace(name = "validationListenerNewProjectCreated")
+
+load("//:bazlets.bzl", "load_bazlets")
+
+load_bazlets(
+    commit = "0f87babe07a555425d829c6e7951e296e9e24579",
+    #    local_path = "/home/<user>/projects/bazlets",
+)
+
+# Release Plugin API
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_api.bzl",
+    "gerrit_api",
+)
+
+# Snapshot Plugin API
+#load(
+#    "@com_googlesource_gerrit_bazlets//:gerrit_api_maven_local.bzl",
+#    "gerrit_api_maven_local",
+#)
+
+# Load release Plugin API
+gerrit_api()
+
+# Load snapshot Plugin API
+#gerrit_api_maven_local()
diff --git a/example-validationListenerNewProjectCreated/bazlets.bzl b/example-validationListenerNewProjectCreated/bazlets.bzl
new file mode 100644
index 0000000..e14e488
--- /dev/null
+++ b/example-validationListenerNewProjectCreated/bazlets.bzl
@@ -0,0 +1,17 @@
+NAME = "com_googlesource_gerrit_bazlets"
+
+def load_bazlets(
+    commit,
+    local_path = None
+  ):
+  if not local_path:
+      native.git_repository(
+          name = NAME,
+          remote = "https://gerrit.googlesource.com/bazlets",
+          commit = commit,
+      )
+  else:
+      native.local_repository(
+          name = NAME,
+          path = local_path,
+      )
diff --git a/example-validationListenerNewProjectCreated/lib/gerrit/BUCK b/example-validationListenerNewProjectCreated/lib/gerrit/BUCK
new file mode 100644
index 0000000..8d5f0e9
--- /dev/null
+++ b/example-validationListenerNewProjectCreated/lib/gerrit/BUCK
@@ -0,0 +1,20 @@
+include_defs('//bucklets/maven_jar.bucklet')
+
+VER = '2.14-SNAPSHOT'
+REPO = MAVEN_LOCAL
+
+maven_jar(
+  name = 'acceptance-framework',
+  id = 'com.google.gerrit:gerrit-acceptance-framework:' + VER,
+  license = 'Apache2.0',
+  attach_source = False,
+  repository = REPO,
+)
+
+maven_jar(
+  name = 'plugin-api',
+  id = 'com.google.gerrit:gerrit-plugin-api:' + VER,
+  license = 'Apache2.0',
+  attach_source = False,
+  repository = REPO,
+)
diff --git a/example-validationListenerNewProjectCreated/pom.xml b/example-validationListenerNewProjectCreated/pom.xml
new file mode 100644
index 0000000..f858854
--- /dev/null
+++ b/example-validationListenerNewProjectCreated/pom.xml
@@ -0,0 +1,85 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+Copyright (C) 2013 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.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>com.googlesource.gerrit.plugins</groupId>
+  <artifactId>example-validationListenerNewProjectCreated</artifactId>
+  <packaging>jar</packaging>
+  <version>2.14-SNAPSHOT</version>
+  <properties>
+    <Gerrit-ApiType>plugin</Gerrit-ApiType>
+    <Gerrit-ApiVersion>${project.version}</Gerrit-ApiVersion>
+  </properties>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>2.4</version>
+        <configuration>
+          <archive>
+            <manifestEntries>
+              <Gerrit-PluginName>example-validationListenerNewProjectCreated</Gerrit-PluginName>
+              <Gerrit-Module>com.googlesource.gerrit.plugins.examples.validationlistenernewprojectcreated.Module</Gerrit-Module>
+
+              <Implementation-Vendor>Gerrit Code Review</Implementation-Vendor>
+              <Implementation-URL>https://gerrit-review.googlesource.com/#/admin/projects/plugins/examples</Implementation-URL>
+
+              <Implementation-Title>Example Validation Listener NewProjectCreated</Implementation-Title>
+              <Implementation-Version>${project.version}</Implementation-Version>
+
+              <Gerrit-ApiType>${Gerrit-ApiType}</Gerrit-ApiType>
+              <Gerrit-ApiVersion>${Gerrit-ApiVersion}</Gerrit-ApiVersion>
+            </manifestEntries>
+          </archive>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>2.3.2</version>
+        <configuration>
+          <source>1.8</source>
+          <target>1.8</target>
+          <encoding>UTF-8</encoding>
+        </configuration>
+      </plugin>
+    </plugins>
+
+  </build>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.google.gerrit</groupId>
+      <artifactId>gerrit-${Gerrit-ApiType}-api</artifactId>
+      <version>${Gerrit-ApiVersion}</version>
+      <scope>provided</scope>
+    </dependency>
+  </dependencies>
+
+  <repositories>
+    <repository>
+      <id>maven.org</id>
+      <url>http://repo1.maven.org/maven2</url>
+    </repository>
+  </repositories>
+</project>
diff --git a/example-validationListenerNewProjectCreated/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenernewprojectcreated/Module.java b/example-validationListenerNewProjectCreated/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenernewprojectcreated/Module.java
new file mode 100644
index 0000000..650febf
--- /dev/null
+++ b/example-validationListenerNewProjectCreated/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenernewprojectcreated/Module.java
@@ -0,0 +1,27 @@
+// Copyright (C) 2013 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.
+
+package com.googlesource.gerrit.plugins.examples.validationlistenernewprojectcreated;
+
+import com.google.gerrit.extensions.events.NewProjectCreatedListener;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.inject.AbstractModule;
+
+public class Module extends AbstractModule {
+  @Override
+  protected void configure() {
+    DynamicSet.bind(binder(), NewProjectCreatedListener.class)
+        .to(ProjectCreatedListener.class);
+  }
+}
diff --git a/example-validationListenerNewProjectCreated/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenernewprojectcreated/ProjectCreatedListener.java b/example-validationListenerNewProjectCreated/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenernewprojectcreated/ProjectCreatedListener.java
new file mode 100644
index 0000000..33c4cc7
--- /dev/null
+++ b/example-validationListenerNewProjectCreated/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenernewprojectcreated/ProjectCreatedListener.java
@@ -0,0 +1,45 @@
+// 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.
+
+package com.googlesource.gerrit.plugins.examples.validationlistenernewprojectcreated;
+
+import com.google.gerrit.extensions.api.GerritApi;
+import com.google.gerrit.extensions.api.projects.ProjectApi;
+import com.google.gerrit.extensions.events.NewProjectCreatedListener;
+import com.google.gerrit.extensions.restapi.RestApiException;
+import com.google.inject.Inject;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class ProjectCreatedListener implements NewProjectCreatedListener {
+  private static final Logger log =
+      LoggerFactory.getLogger(ProjectCreatedListener.class);
+
+  @Inject
+  protected GerritApi gApi;
+
+  @Override
+  public void onNewProjectCreated(Event event) {
+    String name = event.getProjectName();
+    try {
+      ProjectApi api = gApi.projects().name(name);
+      log.info(String.format(
+          "New project: '%s', Parent: '%s'", name, api.get().parent));
+    } catch (RestApiException e) {
+      log.error(String.format(
+          "Failed to get info for new project %s", name), e);
+    }
+  }
+}
diff --git a/example-validationListenerNewProjectCreated/src/main/resources/Documentation/about.md b/example-validationListenerNewProjectCreated/src/main/resources/Documentation/about.md
new file mode 100644
index 0000000..18bf070
--- /dev/null
+++ b/example-validationListenerNewProjectCreated/src/main/resources/Documentation/about.md
@@ -0,0 +1 @@
+Sample plugin to demonstrate the validationListenerNewProjectCreated feature of Gerrit's plugin API.
diff --git a/example-validationListenerNewProjectCreated/tools/bazel.rc b/example-validationListenerNewProjectCreated/tools/bazel.rc
new file mode 100644
index 0000000..4ed16cf
--- /dev/null
+++ b/example-validationListenerNewProjectCreated/tools/bazel.rc
@@ -0,0 +1,2 @@
+build --workspace_status_command=./tools/workspace-status.sh
+test --build_tests_only
diff --git a/example-validationListenerNewProjectCreated/tools/bzl/BUILD b/example-validationListenerNewProjectCreated/tools/bzl/BUILD
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/example-validationListenerNewProjectCreated/tools/bzl/BUILD
diff --git a/example-validationListenerNewProjectCreated/tools/bzl/plugin.bzl b/example-validationListenerNewProjectCreated/tools/bzl/plugin.bzl
new file mode 100644
index 0000000..2b1df8c
--- /dev/null
+++ b/example-validationListenerNewProjectCreated/tools/bzl/plugin.bzl
@@ -0,0 +1,4 @@
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_plugin.bzl",
+    "gerrit_plugin",
+)
diff --git a/example-validationListenerNewProjectCreated/tools/workspace-status.sh b/example-validationListenerNewProjectCreated/tools/workspace-status.sh
new file mode 100755
index 0000000..6ab0b46
--- /dev/null
+++ b/example-validationListenerNewProjectCreated/tools/workspace-status.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# This script will be run by bazel when the build process starts to
+# generate key-value information that represents the status of the
+# workspace. The output should be like
+#
+# KEY1 VALUE1
+# KEY2 VALUE2
+#
+# If the script exits with non-zero code, it's considered as a failure
+# and the output will be discarded.
+
+function rev() {
+  git describe --always --match "v[0-9].*" --dirty
+}
+
+echo STABLE_BUILD_EXAMPLE-VALIDATIONLISTENERNEWPROJECTCREATED_LABEL $(rev)
diff --git a/example-validationListenerRefOperation/.buckconfig b/example-validationListenerRefOperation/.buckconfig
new file mode 100644
index 0000000..81a8e40
--- /dev/null
+++ b/example-validationListenerRefOperation/.buckconfig
@@ -0,0 +1,15 @@
+[alias]
+  plugin = //:example-validationListenerRefOperation
+
+[java]
+  src_roots = java, resources
+  source_level = 8
+  target_level = 8
+
+[project]
+  ignore = .git
+
+[cache]
+  mode = dir
+  dir = buck-out/cache
+
diff --git a/example-validationListenerRefOperation/.gitignore b/example-validationListenerRefOperation/.gitignore
new file mode 100644
index 0000000..db1c934
--- /dev/null
+++ b/example-validationListenerRefOperation/.gitignore
@@ -0,0 +1,8 @@
+/target
+/.classpath
+/.settings
+/.project
+/.buckd
+/buck-cache
+/buck-out
+*.iml
diff --git a/example-validationListenerRefOperation/BUCK b/example-validationListenerRefOperation/BUCK
new file mode 100644
index 0000000..35d515f
--- /dev/null
+++ b/example-validationListenerRefOperation/BUCK
@@ -0,0 +1,18 @@
+include_defs('//bucklets/gerrit_plugin.bucklet')
+
+gerrit_plugin(
+  name = 'example-validationListenerRefOperation',
+  srcs = glob(['src/main/java/**/*.java']),
+  resources = glob(['src/main/**/*']),
+  manifest_entries = [
+    'Gerrit-PluginName: example-validationListenerRefOperation',
+    'Gerrit-Module: com.googlesource.gerrit.plugins.examples.validationlistenerrefoperation.Module',
+    'Implementation-Title: Example Validation Listener RefOperation',
+    'Implementation-URL: https://gerrit-review.googlesource.com/#/admin/projects/plugins/examples',
+  ],
+)
+
+java_library(
+  name = 'classpath',
+  deps = [':example-validationListenerRefOperation__plugin'],
+)
diff --git a/example-validationListenerRefOperation/BUILD b/example-validationListenerRefOperation/BUILD
new file mode 100644
index 0000000..ba73ae4
--- /dev/null
+++ b/example-validationListenerRefOperation/BUILD
@@ -0,0 +1,12 @@
+load("//tools/bzl:plugin.bzl", "gerrit_plugin")
+
+gerrit_plugin(
+    name = "example-validationListenerRefOperation",
+    srcs = glob(["src/main/java/**/*.java"]),
+    manifest_entries = [
+        "Gerrit-PluginName: example-validationListenerRefOperation",
+        "Gerrit-Module: com.googlesource.gerrit.plugins.examples.validationlistenerrefoperation.Module",
+        "Implementation-Title: Example Validation Listener Ref Operation",
+    ],
+    resources = glob(["src/main/resources/**/*"]),
+)
diff --git a/example-validationListenerRefOperation/LICENSE b/example-validationListenerRefOperation/LICENSE
new file mode 100644
index 0000000..11069ed
--- /dev/null
+++ b/example-validationListenerRefOperation/LICENSE
@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+   "License" shall mean the terms and conditions for use, reproduction,
+   and distribution as defined by Sections 1 through 9 of this document.
+
+   "Licensor" shall mean the copyright owner or entity authorized by
+   the copyright owner that is granting the License.
+
+   "Legal Entity" shall mean the union of the acting entity and all
+   other entities that control, are controlled by, or are under common
+   control with that entity. For the purposes of this definition,
+   "control" means (i) the power, direct or indirect, to cause the
+   direction or management of such entity, whether by contract or
+   otherwise, or (ii) ownership of fifty percent (50%) or more of the
+   outstanding shares, or (iii) beneficial ownership of such entity.
+
+   "You" (or "Your") shall mean an individual or Legal Entity
+   exercising permissions granted by this License.
+
+   "Source" form shall mean the preferred form for making modifications,
+   including but not limited to software source code, documentation
+   source, and configuration files.
+
+   "Object" form shall mean any form resulting from mechanical
+   transformation or translation of a Source form, including but
+   not limited to compiled object code, generated documentation,
+   and conversions to other media types.
+
+   "Work" shall mean the work of authorship, whether in Source or
+   Object form, made available under the License, as indicated by a
+   copyright notice that is included in or attached to the work
+   (an example is provided in the Appendix below).
+
+   "Derivative Works" shall mean any work, whether in Source or Object
+   form, that is based on (or derived from) the Work and for which the
+   editorial revisions, annotations, elaborations, or other modifications
+   represent, as a whole, an original work of authorship. For the purposes
+   of this License, Derivative Works shall not include works that remain
+   separable from, or merely link (or bind by name) to the interfaces of,
+   the Work and Derivative Works thereof.
+
+   "Contribution" shall mean any work of authorship, including
+   the original version of the Work and any modifications or additions
+   to that Work or Derivative Works thereof, that is intentionally
+   submitted to Licensor for inclusion in the Work by the copyright owner
+   or by an individual or Legal Entity authorized to submit on behalf of
+   the copyright owner. For the purposes of this definition, "submitted"
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+   to the Licensor or its representatives, including but not limited to
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+5. Submission of Contributions. Unless You explicitly state otherwise,
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+   To apply the Apache License to your work, attach the following
+   boilerplate notice, with the fields enclosed by brackets "[]"
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+   file or class name and description of purpose be included on the
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+Copyright [yyyy] [name of copyright owner]
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+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
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diff --git a/example-validationListenerRefOperation/WORKSPACE b/example-validationListenerRefOperation/WORKSPACE
new file mode 100644
index 0000000..fbf02d6
--- /dev/null
+++ b/example-validationListenerRefOperation/WORKSPACE
@@ -0,0 +1,26 @@
+workspace(name = "validationListenerRefOperation")
+
+load("//:bazlets.bzl", "load_bazlets")
+
+load_bazlets(
+    commit = "0f87babe07a555425d829c6e7951e296e9e24579",
+    #    local_path = "/home/<user>/projects/bazlets",
+)
+
+# Release Plugin API
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_api.bzl",
+    "gerrit_api",
+)
+
+# Snapshot Plugin API
+#load(
+#    "@com_googlesource_gerrit_bazlets//:gerrit_api_maven_local.bzl",
+#    "gerrit_api_maven_local",
+#)
+
+# Load release Plugin API
+gerrit_api()
+
+# Load snapshot Plugin API
+#gerrit_api_maven_local()
diff --git a/example-validationListenerRefOperation/bazlets.bzl b/example-validationListenerRefOperation/bazlets.bzl
new file mode 100644
index 0000000..e14e488
--- /dev/null
+++ b/example-validationListenerRefOperation/bazlets.bzl
@@ -0,0 +1,17 @@
+NAME = "com_googlesource_gerrit_bazlets"
+
+def load_bazlets(
+    commit,
+    local_path = None
+  ):
+  if not local_path:
+      native.git_repository(
+          name = NAME,
+          remote = "https://gerrit.googlesource.com/bazlets",
+          commit = commit,
+      )
+  else:
+      native.local_repository(
+          name = NAME,
+          path = local_path,
+      )
diff --git a/example-validationListenerRefOperation/lib/gerrit/BUCK b/example-validationListenerRefOperation/lib/gerrit/BUCK
new file mode 100644
index 0000000..8d5f0e9
--- /dev/null
+++ b/example-validationListenerRefOperation/lib/gerrit/BUCK
@@ -0,0 +1,20 @@
+include_defs('//bucklets/maven_jar.bucklet')
+
+VER = '2.14-SNAPSHOT'
+REPO = MAVEN_LOCAL
+
+maven_jar(
+  name = 'acceptance-framework',
+  id = 'com.google.gerrit:gerrit-acceptance-framework:' + VER,
+  license = 'Apache2.0',
+  attach_source = False,
+  repository = REPO,
+)
+
+maven_jar(
+  name = 'plugin-api',
+  id = 'com.google.gerrit:gerrit-plugin-api:' + VER,
+  license = 'Apache2.0',
+  attach_source = False,
+  repository = REPO,
+)
diff --git a/example-validationListenerRefOperation/pom.xml b/example-validationListenerRefOperation/pom.xml
new file mode 100644
index 0000000..9e92835
--- /dev/null
+++ b/example-validationListenerRefOperation/pom.xml
@@ -0,0 +1,85 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+Copyright (C) 2013 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.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>com.googlesource.gerrit.plugins</groupId>
+  <artifactId>example-validationListenerRefOperation</artifactId>
+  <packaging>jar</packaging>
+  <version>2.14-SNAPSHOT</version>
+  <properties>
+    <Gerrit-ApiType>plugin</Gerrit-ApiType>
+    <Gerrit-ApiVersion>${project.version}</Gerrit-ApiVersion>
+  </properties>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>2.4</version>
+        <configuration>
+          <archive>
+            <manifestEntries>
+              <Gerrit-PluginName>example-validationListenerRefOperation</Gerrit-PluginName>
+              <Gerrit-Module>com.googlesource.gerrit.plugins.examples.validationlistenerrefoperation.Module</Gerrit-Module>
+
+              <Implementation-Vendor>Gerrit Code Review</Implementation-Vendor>
+              <Implementation-URL>https://gerrit-review.googlesource.com/#/admin/projects/plugins/examples</Implementation-URL>
+
+              <Implementation-Title>Example Validation Listener RefOperation</Implementation-Title>
+              <Implementation-Version>${project.version}</Implementation-Version>
+
+              <Gerrit-ApiType>${Gerrit-ApiType}</Gerrit-ApiType>
+              <Gerrit-ApiVersion>${Gerrit-ApiVersion}</Gerrit-ApiVersion>
+            </manifestEntries>
+          </archive>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>2.3.2</version>
+        <configuration>
+          <source>1.8</source>
+          <target>1.8</target>
+          <encoding>UTF-8</encoding>
+        </configuration>
+      </plugin>
+    </plugins>
+
+  </build>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.google.gerrit</groupId>
+      <artifactId>gerrit-${Gerrit-ApiType}-api</artifactId>
+      <version>${Gerrit-ApiVersion}</version>
+      <scope>provided</scope>
+    </dependency>
+  </dependencies>
+
+  <repositories>
+    <repository>
+      <id>maven.org</id>
+      <url>http://repo1.maven.org/maven2</url>
+    </repository>
+  </repositories>
+</project>
diff --git a/example-validationListenerRefOperation/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerrefoperation/Module.java b/example-validationListenerRefOperation/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerrefoperation/Module.java
new file mode 100644
index 0000000..b80fcff
--- /dev/null
+++ b/example-validationListenerRefOperation/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerrefoperation/Module.java
@@ -0,0 +1,27 @@
+// Copyright (C) 2013 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.
+
+package com.googlesource.gerrit.plugins.examples.validationlistenerrefoperation;
+
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.server.git.validators.RefOperationValidationListener;
+import com.google.inject.AbstractModule;
+
+public class Module extends AbstractModule {
+  @Override
+  protected void configure() {
+    DynamicSet.bind(binder(), RefOperationValidationListener.class)
+        .to(RefOperationValidationExample.class);
+  }
+}
diff --git a/example-validationListenerRefOperation/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerrefoperation/RefOperationValidationExample.java b/example-validationListenerRefOperation/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerrefoperation/RefOperationValidationExample.java
new file mode 100644
index 0000000..4cabd36
--- /dev/null
+++ b/example-validationListenerRefOperation/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerrefoperation/RefOperationValidationExample.java
@@ -0,0 +1,45 @@
+// 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.
+
+package com.googlesource.gerrit.plugins.examples.validationlistenerrefoperation;
+
+import com.google.common.collect.Lists;
+import com.google.gerrit.reviewdb.client.RefNames;
+import com.google.gerrit.server.events.RefReceivedEvent;
+import com.google.gerrit.server.git.validators.RefOperationValidationListener;
+import com.google.gerrit.server.git.validators.ValidationMessage;
+import com.google.gerrit.server.validators.ValidationException;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class RefOperationValidationExample implements
+    RefOperationValidationListener {
+
+  @Override
+  public List<ValidationMessage> onRefOperation(RefReceivedEvent event)
+      throws ValidationException {
+    ArrayList<ValidationMessage> messages = Lists.newArrayList();
+    if (event.command.getRefName()
+        .startsWith(RefNames.REFS_HEADS + "protected-")
+        && !event.user.getCapabilities().canAdministrateServer()) {
+      throw new ValidationException(String.format(
+          "Operation %s on %s branch in project %s is not valid!",
+          event.command.getType(),
+          event.command.getRefName(),
+          event.project.getName()));
+    }
+    return messages;
+  }
+}
diff --git a/example-validationListenerRefOperation/src/main/resources/Documentation/about.md b/example-validationListenerRefOperation/src/main/resources/Documentation/about.md
new file mode 100644
index 0000000..e5c078d
--- /dev/null
+++ b/example-validationListenerRefOperation/src/main/resources/Documentation/about.md
@@ -0,0 +1 @@
+Sample plugin to demonstrate the validationListenerRefOperation feature of Gerrit's plugin API.
diff --git a/example-validationListenerRefOperation/tools/bazel.rc b/example-validationListenerRefOperation/tools/bazel.rc
new file mode 100644
index 0000000..4ed16cf
--- /dev/null
+++ b/example-validationListenerRefOperation/tools/bazel.rc
@@ -0,0 +1,2 @@
+build --workspace_status_command=./tools/workspace-status.sh
+test --build_tests_only
diff --git a/example-validationListenerRefOperation/tools/bzl/BUILD b/example-validationListenerRefOperation/tools/bzl/BUILD
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/example-validationListenerRefOperation/tools/bzl/BUILD
diff --git a/example-validationListenerRefOperation/tools/bzl/plugin.bzl b/example-validationListenerRefOperation/tools/bzl/plugin.bzl
new file mode 100644
index 0000000..2b1df8c
--- /dev/null
+++ b/example-validationListenerRefOperation/tools/bzl/plugin.bzl
@@ -0,0 +1,4 @@
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_plugin.bzl",
+    "gerrit_plugin",
+)
diff --git a/example-validationListenerRefOperation/tools/workspace-status.sh b/example-validationListenerRefOperation/tools/workspace-status.sh
new file mode 100755
index 0000000..a157618
--- /dev/null
+++ b/example-validationListenerRefOperation/tools/workspace-status.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# This script will be run by bazel when the build process starts to
+# generate key-value information that represents the status of the
+# workspace. The output should be like
+#
+# KEY1 VALUE1
+# KEY2 VALUE2
+#
+# If the script exits with non-zero code, it's considered as a failure
+# and the output will be discarded.
+
+function rev() {
+  git describe --always --match "v[0-9].*" --dirty
+}
+
+echo STABLE_BUILD_EXAMPLE-VALIDATIONLISTENERREFOPERATION_LABEL $(rev)
diff --git a/example-validationListenerUpload/.buckconfig b/example-validationListenerUpload/.buckconfig
new file mode 100644
index 0000000..277e01e
--- /dev/null
+++ b/example-validationListenerUpload/.buckconfig
@@ -0,0 +1,15 @@
+[alias]
+  plugin = //:example-validationListenerUpload
+
+[java]
+  src_roots = java, resources
+  source_level = 8
+  target_level = 8
+
+[project]
+  ignore = .git
+
+[cache]
+  mode = dir
+  dir = buck-out/cache
+
diff --git a/example-validationListenerUpload/.gitignore b/example-validationListenerUpload/.gitignore
new file mode 100644
index 0000000..db1c934
--- /dev/null
+++ b/example-validationListenerUpload/.gitignore
@@ -0,0 +1,8 @@
+/target
+/.classpath
+/.settings
+/.project
+/.buckd
+/buck-cache
+/buck-out
+*.iml
diff --git a/example-validationListenerUpload/BUCK b/example-validationListenerUpload/BUCK
new file mode 100644
index 0000000..07b9292
--- /dev/null
+++ b/example-validationListenerUpload/BUCK
@@ -0,0 +1,18 @@
+include_defs('//bucklets/gerrit_plugin.bucklet')
+
+gerrit_plugin(
+  name = 'example-validationListenerUpload',
+  srcs = glob(['src/main/java/**/*.java']),
+  resources = glob(['src/main/**/*']),
+  manifest_entries = [
+    'Gerrit-PluginName: example-validationListenerUpload',
+    'Gerrit-Module: com.googlesource.gerrit.plugins.examples.validationlistenerupload.Module',
+    'Implementation-Title: Example Validation Listener Upload',
+    'Implementation-URL: https://gerrit-review.googlesource.com/#/admin/projects/plugins/examples',
+  ],
+)
+
+java_library(
+  name = 'classpath',
+  deps = [':example-validationListenerUpload__plugin'],
+)
diff --git a/example-validationListenerUpload/BUILD b/example-validationListenerUpload/BUILD
new file mode 100644
index 0000000..472b79b
--- /dev/null
+++ b/example-validationListenerUpload/BUILD
@@ -0,0 +1,12 @@
+load("//tools/bzl:plugin.bzl", "gerrit_plugin")
+
+gerrit_plugin(
+    name = "example-validationListenerUpload",
+    srcs = glob(["src/main/java/**/*.java"]),
+    manifest_entries = [
+        "Gerrit-PluginName: example-validationListenerUpload",
+        "Gerrit-Module: com.googlesource.gerrit.plugins.examples.validationlistenerupload.Module",
+        "Implementation-Title: Example Validation Listener Upload",
+    ],
+    resources = glob(["src/main/resources/**/*"]),
+)
diff --git a/example-validationListenerUpload/LICENSE b/example-validationListenerUpload/LICENSE
new file mode 100644
index 0000000..11069ed
--- /dev/null
+++ b/example-validationListenerUpload/LICENSE
@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+   "License" shall mean the terms and conditions for use, reproduction,
+   and distribution as defined by Sections 1 through 9 of this document.
+
+   "Licensor" shall mean the copyright owner or entity authorized by
+   the copyright owner that is granting the License.
+
+   "Legal Entity" shall mean the union of the acting entity and all
+   other entities that control, are controlled by, or are under common
+   control with that entity. For the purposes of this definition,
+   "control" means (i) the power, direct or indirect, to cause the
+   direction or management of such entity, whether by contract or
+   otherwise, or (ii) ownership of fifty percent (50%) or more of the
+   outstanding shares, or (iii) beneficial ownership of such entity.
+
+   "You" (or "Your") shall mean an individual or Legal Entity
+   exercising permissions granted by this License.
+
+   "Source" form shall mean the preferred form for making modifications,
+   including but not limited to software source code, documentation
+   source, and configuration files.
+
+   "Object" form shall mean any form resulting from mechanical
+   transformation or translation of a Source form, including but
+   not limited to compiled object code, generated documentation,
+   and conversions to other media types.
+
+   "Work" shall mean the work of authorship, whether in Source or
+   Object form, made available under the License, as indicated by a
+   copyright notice that is included in or attached to the work
+   (an example is provided in the Appendix below).
+
+   "Derivative Works" shall mean any work, whether in Source or Object
+   form, that is based on (or derived from) the Work and for which the
+   editorial revisions, annotations, elaborations, or other modifications
+   represent, as a whole, an original work of authorship. For the purposes
+   of this License, Derivative Works shall not include works that remain
+   separable from, or merely link (or bind by name) to the interfaces of,
+   the Work and Derivative Works thereof.
+
+   "Contribution" shall mean any work of authorship, including
+   the original version of the Work and any modifications or additions
+   to that Work or Derivative Works thereof, that is intentionally
+   submitted to Licensor for inclusion in the Work by the copyright owner
+   or by an individual or Legal Entity authorized to submit on behalf of
+   the copyright owner. For the purposes of this definition, "submitted"
+   means any form of electronic, verbal, or written communication sent
+   to the Licensor or its representatives, including but not limited to
+   communication on electronic mailing lists, source code control systems,
+   and issue tracking systems that are managed by, or on behalf of, the
+   Licensor for the purpose of discussing and improving the Work, but
+   excluding communication that is conspicuously marked or otherwise
+   designated in writing by the copyright owner as "Not a Contribution."
+
+   "Contributor" shall mean Licensor and any individual or Legal Entity
+   on behalf of whom a Contribution has been received by Licensor and
+   subsequently incorporated within the Work.
+
+2. Grant of Copyright License. Subject to the terms and conditions of
+   this License, each Contributor hereby grants to You a perpetual,
+   worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+   copyright license to reproduce, prepare Derivative Works of,
+   publicly display, publicly perform, sublicense, and distribute the
+   Work and such Derivative Works in Source or Object form.
+
+3. Grant of Patent License. Subject to the terms and conditions of
+   this License, each Contributor hereby grants to You a perpetual,
+   worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+   (except as stated in this section) patent license to make, have made,
+   use, offer to sell, sell, import, and otherwise transfer the Work,
+   where such license applies only to those patent claims licensable
+   by such Contributor that are necessarily infringed by their
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+
+Unless required by applicable law or agreed to in writing, software
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diff --git a/example-validationListenerUpload/WORKSPACE b/example-validationListenerUpload/WORKSPACE
new file mode 100644
index 0000000..71770df
--- /dev/null
+++ b/example-validationListenerUpload/WORKSPACE
@@ -0,0 +1,26 @@
+workspace(name = "validationListenerUpload")
+
+load("//:bazlets.bzl", "load_bazlets")
+
+load_bazlets(
+    commit = "0f87babe07a555425d829c6e7951e296e9e24579",
+    #    local_path = "/home/<user>/projects/bazlets",
+)
+
+# Release Plugin API
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_api.bzl",
+    "gerrit_api",
+)
+
+# Snapshot Plugin API
+#load(
+#    "@com_googlesource_gerrit_bazlets//:gerrit_api_maven_local.bzl",
+#    "gerrit_api_maven_local",
+#)
+
+# Load release Plugin API
+gerrit_api()
+
+# Load snapshot Plugin API
+#gerrit_api_maven_local()
diff --git a/example-validationListenerUpload/bazlets.bzl b/example-validationListenerUpload/bazlets.bzl
new file mode 100644
index 0000000..e14e488
--- /dev/null
+++ b/example-validationListenerUpload/bazlets.bzl
@@ -0,0 +1,17 @@
+NAME = "com_googlesource_gerrit_bazlets"
+
+def load_bazlets(
+    commit,
+    local_path = None
+  ):
+  if not local_path:
+      native.git_repository(
+          name = NAME,
+          remote = "https://gerrit.googlesource.com/bazlets",
+          commit = commit,
+      )
+  else:
+      native.local_repository(
+          name = NAME,
+          path = local_path,
+      )
diff --git a/example-validationListenerUpload/lib/gerrit/BUCK b/example-validationListenerUpload/lib/gerrit/BUCK
new file mode 100644
index 0000000..8d5f0e9
--- /dev/null
+++ b/example-validationListenerUpload/lib/gerrit/BUCK
@@ -0,0 +1,20 @@
+include_defs('//bucklets/maven_jar.bucklet')
+
+VER = '2.14-SNAPSHOT'
+REPO = MAVEN_LOCAL
+
+maven_jar(
+  name = 'acceptance-framework',
+  id = 'com.google.gerrit:gerrit-acceptance-framework:' + VER,
+  license = 'Apache2.0',
+  attach_source = False,
+  repository = REPO,
+)
+
+maven_jar(
+  name = 'plugin-api',
+  id = 'com.google.gerrit:gerrit-plugin-api:' + VER,
+  license = 'Apache2.0',
+  attach_source = False,
+  repository = REPO,
+)
diff --git a/example-validationListenerUpload/pom.xml b/example-validationListenerUpload/pom.xml
new file mode 100644
index 0000000..289db64
--- /dev/null
+++ b/example-validationListenerUpload/pom.xml
@@ -0,0 +1,85 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+Copyright (C) 2013 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.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>com.googlesource.gerrit.plugins</groupId>
+  <artifactId>example-validationListenerUpload</artifactId>
+  <packaging>jar</packaging>
+  <version>2.14-SNAPSHOT</version>
+  <properties>
+    <Gerrit-ApiType>plugin</Gerrit-ApiType>
+    <Gerrit-ApiVersion>${project.version}</Gerrit-ApiVersion>
+  </properties>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>2.4</version>
+        <configuration>
+          <archive>
+            <manifestEntries>
+              <Gerrit-PluginName>example-validationListenerUpload</Gerrit-PluginName>
+              <Gerrit-Module>com.googlesource.gerrit.plugins.examples.validationlistenerupload.Module</Gerrit-Module>
+
+              <Implementation-Vendor>Gerrit Code Review</Implementation-Vendor>
+              <Implementation-URL>https://gerrit-review.googlesource.com/#/admin/projects/plugins/examples</Implementation-URL>
+
+              <Implementation-Title>Example Validation Listener Upload</Implementation-Title>
+              <Implementation-Version>${project.version}</Implementation-Version>
+
+              <Gerrit-ApiType>${Gerrit-ApiType}</Gerrit-ApiType>
+              <Gerrit-ApiVersion>${Gerrit-ApiVersion}</Gerrit-ApiVersion>
+            </manifestEntries>
+          </archive>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>2.3.2</version>
+        <configuration>
+          <source>1.8</source>
+          <target>1.8</target>
+          <encoding>UTF-8</encoding>
+        </configuration>
+      </plugin>
+    </plugins>
+
+  </build>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.google.gerrit</groupId>
+      <artifactId>gerrit-${Gerrit-ApiType}-api</artifactId>
+      <version>${Gerrit-ApiVersion}</version>
+      <scope>provided</scope>
+    </dependency>
+  </dependencies>
+
+  <repositories>
+    <repository>
+      <id>maven.org</id>
+      <url>http://repo1.maven.org/maven2</url>
+    </repository>
+  </repositories>
+</project>
diff --git a/example-validationListenerUpload/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerupload/DenyUploadExample.java b/example-validationListenerUpload/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerupload/DenyUploadExample.java
new file mode 100644
index 0000000..7d85dce
--- /dev/null
+++ b/example-validationListenerUpload/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerupload/DenyUploadExample.java
@@ -0,0 +1,44 @@
+// Copyright (C) 2014 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.
+
+package com.googlesource.gerrit.plugins.examples.validationlistenerupload;
+
+import com.google.gerrit.reviewdb.client.Project;
+import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.server.git.validators.UploadValidationListener;
+import com.google.gerrit.server.validators.ValidationException;
+import com.google.inject.Inject;
+
+import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.transport.UploadPack;
+
+import java.util.Collection;
+
+public class DenyUploadExample implements UploadValidationListener {
+  @Inject
+  private CurrentUser user;
+
+  @Override
+  public void onPreUpload(Repository repository, Project project,
+      String remoteHost, UploadPack up, Collection<? extends ObjectId> wants,
+      Collection<? extends ObjectId> haves) throws ValidationException {
+    up.sendMessage("Validating project name for " + user.getUserName() + "\n");
+    up.sendMessage("  from host: " + remoteHost + "\n");
+    if (project.getName().equals("deny-upload-project")) {
+      throw new ValidationException(
+          "This error message was sent from example-validationListenerUpload plugin DenyUploadExample.");
+    }
+  }
+}
diff --git a/example-validationListenerUpload/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerupload/Module.java b/example-validationListenerUpload/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerupload/Module.java
new file mode 100644
index 0000000..8bb84a3
--- /dev/null
+++ b/example-validationListenerUpload/src/main/java/com/googlesource/gerrit/plugins/examples/validationlistenerupload/Module.java
@@ -0,0 +1,27 @@
+// Copyright (C) 2013 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.
+
+package com.googlesource.gerrit.plugins.examples.validationlistenerupload;
+
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.server.git.validators.UploadValidationListener;
+import com.google.inject.AbstractModule;
+
+public class Module extends AbstractModule {
+  @Override
+  protected void configure() {
+    DynamicSet.bind(binder(), UploadValidationListener.class)
+        .to(DenyUploadExample.class);
+  }
+}
diff --git a/example-validationListenerUpload/src/main/resources/Documentation/about.md b/example-validationListenerUpload/src/main/resources/Documentation/about.md
new file mode 100644
index 0000000..61e7384
--- /dev/null
+++ b/example-validationListenerUpload/src/main/resources/Documentation/about.md
@@ -0,0 +1 @@
+Sample plugin to demonstrate the validationListenerUpload feature of Gerrit's plugin API.
diff --git a/example-validationListenerUpload/tools/bazel.rc b/example-validationListenerUpload/tools/bazel.rc
new file mode 100644
index 0000000..4ed16cf
--- /dev/null
+++ b/example-validationListenerUpload/tools/bazel.rc
@@ -0,0 +1,2 @@
+build --workspace_status_command=./tools/workspace-status.sh
+test --build_tests_only
diff --git a/example-validationListenerUpload/tools/bzl/BUILD b/example-validationListenerUpload/tools/bzl/BUILD
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/example-validationListenerUpload/tools/bzl/BUILD
diff --git a/example-validationListenerUpload/tools/bzl/plugin.bzl b/example-validationListenerUpload/tools/bzl/plugin.bzl
new file mode 100644
index 0000000..2b1df8c
--- /dev/null
+++ b/example-validationListenerUpload/tools/bzl/plugin.bzl
@@ -0,0 +1,4 @@
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_plugin.bzl",
+    "gerrit_plugin",
+)
diff --git a/example-validationListenerUpload/tools/workspace-status.sh b/example-validationListenerUpload/tools/workspace-status.sh
new file mode 100755
index 0000000..9248805
--- /dev/null
+++ b/example-validationListenerUpload/tools/workspace-status.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# This script will be run by bazel when the build process starts to
+# generate key-value information that represents the status of the
+# workspace. The output should be like
+#
+# KEY1 VALUE1
+# KEY2 VALUE2
+#
+# If the script exits with non-zero code, it's considered as a failure
+# and the output will be discarded.
+
+function rev() {
+  git describe --always --match "v[0-9].*" --dirty
+}
+
+echo STABLE_BUILD_EXAMPLE-VALIDATIONLISTENERUPLOAD_LABEL $(rev)