Use appassembler in Pub/Sub example

Author: mziccard

gcloud-java-examples/README.md

@@ -104,10 +104,10 @@ To run examples from your command line:
 
     Before running the example, go to the [Google Developers Console][developers-console] to ensure that "Google Cloud Pub/Sub" is enabled.
     ```
-    mvn exec:java -Dexec.mainClass="com.google.cloud.examples.pubsub.PubSubExample" -Dexec.args="create topic test-topic"
-    mvn exec:java -Dexec.mainClass="com.google.cloud.examples.pubsub.PubSubExample" -Dexec.args="create subscription test-topic test-subscription"
-    mvn exec:java -Dexec.mainClass="com.google.cloud.examples.pubsub.PubSubExample" -Dexec.args="publish test-topic message1 message2"
-    mvn exec:java -Dexec.mainClass="com.google.cloud.examples.pubsub.PubSubExample" -Dexec.args="pull sync test-subscription 2"
+    target/appassembler/bin/PubSubExample create topic test-topic
+    target/appassembler/bin/PubSubExample create subscription test-topic test-subscription
+    target/appassembler/bin/PubSubExample publish test-topic message1 message2
+    target/appassembler/bin/PubSubExample pull sync test-subscription 2
     ```
 
   * Here's an example run of `ResourceManagerExample`.

gcloud-java-examples/pom.xml

@@ -80,6 +80,12 @@
               <mainClass>com.google.cloud.examples.nio.ParallelCountBytes</mainClass>
               <name>ParallelCountBytes</name>
             </program>
+            <program>
+              <mainClass>
+                com.google.cloud.examples.pubsub.PubSubExample
+              </mainClass>
+              <name>PubSubExample</name>
+            </program>
             <program>
               <mainClass>
                 com.google.cloud.examples.resourcemanager.ResourceManagerExample

gcloud-java-examples/src/main/java/com/google/cloud/examples/pubsub/PubSubExample.java

@@ -43,12 +43,10 @@
  *
  * <p>This example demonstrates a simple/typical Pub/Sub usage.
  *
- * <p>Steps needed for running the example:
- * <ol>
- * <li>login using gcloud SDK - {@code gcloud auth login}.</li>
- * <li>compile using maven - {@code mvn compile}</li>
- * <li>run using maven -
- * <pre>{@code mvn exec:java -Dexec.mainClass="com.google.cloud.examples.pubsub.PubSubExample"
+ * <p>See the
+ * <a href="https://github.com/GoogleCloudPlatform/gcloud-java/blob/master/gcloud-java-examples/README.md">
+ * README</a> for compilation instructions. Run this code with
+ * <pre>{@code target/appassembler/bin/PubSubExample
  *  -Dexec.args="[<project_id>]
  *  pull async <subscription> <timeoutMillis>?
  *  pull sync <subscription> <maxMessages>
@@ -64,8 +62,6 @@
  *  delete subscription <subscription>
  *  info topic <topic>
  *  info subscription <subscription>"}</pre>
- * </li>
- * </ol>
  *
  * <p>The first parameter is an optional {@code project_id} (logged-in project will be used if not
  * supplied). Second parameter is a Pub/Sub operation and can be used to demonstrate its usage. For