Update CreateTopicAndPublishMessages.java

google-cloud-examples/src/main/java/com/google/cloud/examples/pubsub/snippets/CreateTopicAndPublishMessages.java

@@ -83,11 +83,8 @@ public static void publishMessages() throws Exception {
   public static void publishMessagesWithErrorHandler() throws Exception {
     // [START pubsub_publish_error_handler]
     ProjectTopicName topicName = ProjectTopicName.of("my-project-id", "my-topic-id");
-    Publisher publisher = null;
 
-    try {
-      // Create a publisher instance with default settings bound to the topic
-      publisher = Publisher.newBuilder(topicName).build();
+    try (Publisher publisher = Publisher.newBuilder(topicName).build()) {
 
       List<String> messages = Arrays.asList("first message", "second message");
 
@@ -119,17 +116,13 @@ public void onSuccess(String messageId) {
           }
         });
       }
-    } finally {
-      if (publisher != null) {
-        // When finished with the publisher, shutdown to free up resources.
-        publisher.shutdown();
-      }
     }
     // [END pubsub_publish_error_handler]
   }
 
   public static void main(String... args) throws Exception {
     createTopic();
     publishMessages();
+    publishMessagesWithErrorHandler();
   }
 }