diff --git a/BUILD b/BUILD
index d88c2d7..9857d67 100644
--- a/BUILD
+++ b/BUILD
@@ -2,6 +2,7 @@
     name = "all",
     srcs = [
         "//example-adminSshCommand",
+        "//example-assigneeValidator",
         "//example-changeOperator",
         "//example-commitValidator",
         "//example-restApiGetRevision",
diff --git a/example-assigneeValidator/.buckconfig b/example-assigneeValidator/.buckconfig
new file mode 100644
index 0000000..00c5e8e
--- /dev/null
+++ b/example-assigneeValidator/.buckconfig
@@ -0,0 +1,15 @@
+[alias]
+  plugin = //:example-assigneeValidator
+
+[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-assigneeValidator/BUCK b/example-assigneeValidator/BUCK
new file mode 100644
index 0000000..2eeaf10
--- /dev/null
+++ b/example-assigneeValidator/BUCK
@@ -0,0 +1,18 @@
+include_defs('//bucklets/gerrit_plugin.bucklet')
+
+gerrit_plugin(
+  name = 'example-assigneeValidator',
+  srcs = glob(['src/main/java/**/*.java']),
+  resources = glob(['src/main/**/*']),
+  manifest_entries = [
+    'Gerrit-PluginName: example-assigneeValidator',
+    'Gerrit-Module: com.googlesource.gerrit.plugins.examples.assigneevalidator.Module',
+    'Implementation-Title: Example Assignee Validator',
+    'Implementation-URL: https://gerrit-review.googlesource.com/#/admin/projects/plugins/examples',
+  ],
+)
+
+java_library(
+  name = 'classpath',
+  deps = [':example-assigneevalidator__plugin'],
+)
diff --git a/example-assigneeValidator/BUILD b/example-assigneeValidator/BUILD
new file mode 100644
index 0000000..44a3877
--- /dev/null
+++ b/example-assigneeValidator/BUILD
@@ -0,0 +1,12 @@
+load("//tools/bzl:plugin.bzl", "gerrit_plugin")
+
+gerrit_plugin(
+    name = "example-assigneeValidator",
+    srcs = glob(["src/main/java/**/*.java"]),
+    manifest_entries = [
+        "Gerrit-PluginName: example-assigneeValidator",
+        "Gerrit-Module: com.googlesource.gerrit.plugins.examples.assigneevalidator.Module",
+        "Implementation-Title: Example Assignee Validator",
+    ],
+    resources = glob(["src/main/resources/**/*"]),
+)
diff --git a/example-assigneeValidator/LICENSE b/example-assigneeValidator/LICENSE
new file mode 100644
index 0000000..11069ed
--- /dev/null
+++ b/example-assigneeValidator/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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+6. Trademarks. This License does not grant permission to use the trade
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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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+Copyright [yyyy] [name of copyright owner]
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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.
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diff --git a/example-assigneeValidator/WORKSPACE b/example-assigneeValidator/WORKSPACE
new file mode 100644
index 0000000..27f10b7
--- /dev/null
+++ b/example-assigneeValidator/WORKSPACE
@@ -0,0 +1,26 @@
+workspace(name = "assigneeValidator")
+
+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-assigneeValidator/bazel-example-assigneeValidator b/example-assigneeValidator/bazel-example-assigneeValidator
new file mode 120000
index 0000000..94bcb8f
--- /dev/null
+++ b/example-assigneeValidator/bazel-example-assigneeValidator
@@ -0,0 +1 @@
+/private/var/tmp/_bazel_jmelvin/ff3134ee89b7c76ee4c5952fa27dd382/execroot/assigneeValidator
\ No newline at end of file
diff --git a/example-assigneeValidator/bazlets.bzl b/example-assigneeValidator/bazlets.bzl
new file mode 100644
index 0000000..e14e488
--- /dev/null
+++ b/example-assigneeValidator/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-assigneeValidator/lib/gerrit/BUCK b/example-assigneeValidator/lib/gerrit/BUCK
new file mode 100644
index 0000000..8d5f0e9
--- /dev/null
+++ b/example-assigneeValidator/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-assigneeValidator/pom.xml b/example-assigneeValidator/pom.xml
new file mode 100644
index 0000000..8491811
--- /dev/null
+++ b/example-assigneeValidator/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-assigneeValidator</artifactId>
+  <packaging>jar</packaging>
+  <version>2.14-SNAPSHOT</version>
+  <properties>
+    <Gerrit-ApiType>plugin</Gerrit-ApiType>
+    <Gerrit-ApiVersion>${project.version}</Gerrit-ApiVersion>
+  </properties>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>2.4</version>
+        <configuration>
+          <archive>
+            <manifestEntries>
+              <Gerrit-PluginName>example-assigneeValidator</Gerrit-PluginName>
+              <Gerrit-Module>com.googlesource.gerrit.plugins.examples.assigneevalidator.Module</Gerrit-Module>
+
+              <Implementation-Vendor>Gerrit Code Review</Implementation-Vendor>
+              <Implementation-URL>https://gerrit-review.googlesource.com/#/admin/projects/plugins/examples</Implementation-URL>
+
+              <Implementation-Title>Example Assignee Validator</Implementation-Title>
+              <Implementation-Version>${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-assigneeValidator/src/main/java/com/googlesource/gerrit/plugins/examples/assigneevalidator/AssigneeValidator.java b/example-assigneeValidator/src/main/java/com/googlesource/gerrit/plugins/examples/assigneevalidator/AssigneeValidator.java
new file mode 100644
index 0000000..0da6acd
--- /dev/null
+++ b/example-assigneeValidator/src/main/java/com/googlesource/gerrit/plugins/examples/assigneevalidator/AssigneeValidator.java
@@ -0,0 +1,54 @@
+// Copyright (C) 2017 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.assigneevalidator;
+
+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-assigneeValidator/src/main/java/com/googlesource/gerrit/plugins/examples/assigneevalidator/Module.java b/example-assigneeValidator/src/main/java/com/googlesource/gerrit/plugins/examples/assigneevalidator/Module.java
new file mode 100644
index 0000000..ceb85d5
--- /dev/null
+++ b/example-assigneeValidator/src/main/java/com/googlesource/gerrit/plugins/examples/assigneevalidator/Module.java
@@ -0,0 +1,27 @@
+// Copyright (C) 2017 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.assigneevalidator;
+
+import com.google.inject.AbstractModule;
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.server.validators.AssigneeValidationListener;
+
+public class Module extends AbstractModule {
+  @Override
+  protected void configure() {
+    DynamicSet.bind(binder(),
+        AssigneeValidationListener.class).to(AssigneeValidator.class);
+  }
+}
diff --git a/example-assigneeValidator/src/main/resources/Documentation/about.md b/example-assigneeValidator/src/main/resources/Documentation/about.md
new file mode 100644
index 0000000..7b3bd87
--- /dev/null
+++ b/example-assigneeValidator/src/main/resources/Documentation/about.md
@@ -0,0 +1 @@
+Sample plugin to demonstrate the Assignee Validator feature of Gerrit's plugin API.
diff --git a/example-assigneeValidator/tools/bazel.rc b/example-assigneeValidator/tools/bazel.rc
new file mode 100644
index 0000000..4ed16cf
--- /dev/null
+++ b/example-assigneeValidator/tools/bazel.rc
@@ -0,0 +1,2 @@
+build --workspace_status_command=./tools/workspace-status.sh
+test --build_tests_only
diff --git a/example-assigneeValidator/tools/bzl/BUILD b/example-assigneeValidator/tools/bzl/BUILD
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/example-assigneeValidator/tools/bzl/BUILD
diff --git a/example-assigneeValidator/tools/bzl/plugin.bzl b/example-assigneeValidator/tools/bzl/plugin.bzl
new file mode 100644
index 0000000..2b1df8c
--- /dev/null
+++ b/example-assigneeValidator/tools/bzl/plugin.bzl
@@ -0,0 +1,4 @@
+load(
+    "@com_googlesource_gerrit_bazlets//:gerrit_plugin.bzl",
+    "gerrit_plugin",
+)
diff --git a/example-assigneeValidator/tools/workspace-status.sh b/example-assigneeValidator/tools/workspace-status.sh
new file mode 100755
index 0000000..0322307
--- /dev/null
+++ b/example-assigneeValidator/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-ASSIGNEEVALIDATOR_LABEL $(rev)