Update PubSub sample.

Author: kurtisvg

appengine-java8/pubsub/src/main/java/com/example/appengine/pubsub/PubSubPublish.java

@@ -19,6 +19,7 @@
 import com.google.cloud.ServiceOptions;
 import com.google.cloud.pubsub.v1.Publisher;
 import com.google.protobuf.ByteString;
+import com.google.pubsub.v1.ProjectTopicName;
 import com.google.pubsub.v1.PubsubMessage;
 import com.google.pubsub.v1.TopicName;
 import java.io.IOException;
@@ -40,9 +41,11 @@ public void doPost(HttpServletRequest req, HttpServletResponse resp)
       String topicId = System.getenv("PUBSUB_TOPIC");
       // create a publisher on the topic
       if (publisher == null) {
-        publisher = Publisher.defaultBuilder(
-            TopicName.create(ServiceOptions.getDefaultProjectId(), topicId))
+        ProjectTopicName topicName = ProjectTopicName.newBuilder()
+            .setProject(ServiceOptions.getDefaultProjectId())
+            .setTopic(topicId)
             .build();
+        publisher = Publisher.newBuilder(topicName).build();
       }
       // construct a pubsub message from the payload
       final String payload = req.getParameter("payload");