Question

Can any one provide sample program to dequeue messages in Java? I want standalone java program which will do this task.

Lets say Oracle ha enqueued messages using JMS_TEXT_MESSAGE a payload type in queue “myqueue” whose owner is “myowner” & now I want to dequeue these messages using Java. Can any one provide sample program in stand alone Java?

Thanks!

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@Ratha, I tried your sample & I can browse through all the messages & it works perfect!

However, when I try to consume those messages, I thought they’ll get removed from the queue & display it to me through below line:

 System.out.println("MESSAGE RECEIVED " + msg.getText());

But instead, it gives me error on below line:

 MessageConsumer consumer = session.createConsumer(queue);

Exception in thread "main" java.lang.AbstractMethodError: oracle.jms.AQjmsSession.createConsumer(Ljavax/jms/Destination;)Ljavax/jms/MessageConsumer;
at OracleAQClient.consumeMessage(OracleAQClient.java:141)
at OracleAQClient.main(OracleAQClient.java:159)

Can you please help me how to fix this error?

Thanks!

Answer 1

You can right vendor specific or vendor neutral code..
To dequeue the message, use following code block

 public static void consumeMessage(String user, String queueName) {  
  Queue queue;
  try {
   QueueConnection QCon = getConnection();  
   Session session = QCon.createQueueSession(false,Session.CLIENT_ACKNOWLEDGE);
   QCon.start();
   queue = ((AQjmsSession) session).getQueue(user, queueName);
   MessageConsumer consumer = session.createConsumer(queue);
   TextMessage msg = (TextMessage) consumer.receive();
   System.out.println("MESSAGE RECEIVED " + msg.getText());

   consumer.close();
   session.close();
   QCon.close();
  } catch (JMSException e) {  
   e.printStackTrace();
  }
 }

I have written, these posts, which contain more detail code;

http://vvratha.blogspot.com/2011/10/creating-queue-in-oracleaq.html

http://vvratha.blogspot.com/2011/10/java-client-for-jndi-lookup-with-ojms.html