Fix checkstyle errors when building archetype-generated apps

Checkstyle validation is now enabled by default in onos-dependencies
(archetypes' parent pom). We also add a reference to the archetypes' pom
to disable checkstyle, if needed.

Change-Id: I9b6e6cecf2d704f52ec1f118eae2aafd03cf0b9a
diff --git a/tools/package/archetypes/bundle/pom.xml b/tools/package/archetypes/bundle/pom.xml
index 4b2d913..31c19f3 100644
--- a/tools/package/archetypes/bundle/pom.xml
+++ b/tools/package/archetypes/bundle/pom.xml
@@ -14,18 +14,34 @@
   ~ 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/xsd/maven-4.0.0.xsd">
-  <modelVersion>4.0.0</modelVersion>
+<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/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
 
-  <parent>
-    <groupId>org.onosproject</groupId>
-    <artifactId>onos-archetypes</artifactId>
-    <version>2.2.1-SNAPSHOT</version>
-  </parent>
+    <parent>
+        <groupId>org.onosproject</groupId>
+        <artifactId>onos-archetypes</artifactId>
+        <version>2.2.1-SNAPSHOT</version>
+    </parent>
 
-  <artifactId>onos-bundle-archetype</artifactId>
-  <packaging>maven-archetype</packaging>
+    <artifactId>onos-bundle-archetype</artifactId>
+    <packaging>maven-archetype</packaging>
 
-  <description>ONOS OSGi bundle archetype</description>
+    <description>ONOS OSGi bundle archetype</description>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
+                <!-- Uncomment to disable checkstyle validation
+                <configuration>
+                    <skip>true</skip>
+                </configuration>
+                -->
+            </plugin>
+        </plugins>
+    </build>
 
 </project>
diff --git a/tools/package/archetypes/bundle/src/main/resources/archetype-resources/src/main/java/AppComponent.java b/tools/package/archetypes/bundle/src/main/resources/archetype-resources/src/main/java/AppComponent.java
index c2fc6428..68d35f1 100644
--- a/tools/package/archetypes/bundle/src/main/resources/archetype-resources/src/main/java/AppComponent.java
+++ b/tools/package/archetypes/bundle/src/main/resources/archetype-resources/src/main/java/AppComponent.java
@@ -18,7 +18,6 @@
  */
 package ${package};
 
-import com.google.common.collect.ImmutableSet;
 import org.onosproject.cfg.ComponentConfigService;
 import org.osgi.service.component.ComponentContext;
 import org.osgi.service.component.annotations.Activate;
diff --git a/tools/package/archetypes/bundle/src/main/resources/archetype-resources/src/main/java/package-info.java b/tools/package/archetypes/bundle/src/main/resources/archetype-resources/src/main/java/package-info.java
new file mode 100644
index 0000000..3d2d640
--- /dev/null
+++ b/tools/package/archetypes/bundle/src/main/resources/archetype-resources/src/main/java/package-info.java
@@ -0,0 +1,23 @@
+#set( $symbol_pound = '#' )
+#set( $symbol_dollar = '$' )
+#set( $symbol_escape = '\' )
+/*
+ * Copyright ${year}-present Open Networking Foundation
+ *
+ * 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.
+ */
+
+/**
+ * The ${artifactId} application.
+ */
+package ${package};
diff --git a/tools/package/archetypes/bundle/src/main/resources/archetype-resources/src/test/java/AppComponentTest.java b/tools/package/archetypes/bundle/src/main/resources/archetype-resources/src/test/java/AppComponentTest.java
index 05e712d..bcb3bdf 100644
--- a/tools/package/archetypes/bundle/src/main/resources/archetype-resources/src/test/java/AppComponentTest.java
+++ b/tools/package/archetypes/bundle/src/main/resources/archetype-resources/src/test/java/AppComponentTest.java
@@ -21,11 +21,7 @@
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
-import org.onosproject.cfg.ComponentConfigService;
 import org.onosproject.cfg.ComponentConfigAdapter;
-import org.onosproject.cfg.ConfigProperty;
-
-import java.util.Set;
 
 /**
  * Set of tests of the ONOS application component.