Hi,
I am using JBoss 3.2.3. I have an class which writes to a queue which is listened by a MDB.

I am using :

queueSession = queueConnection.createQueueSession(false,Session.CLIENT_ACKNOWLEDGE);

to create a queue session. When i write out a message to the queue, it is picked by the MDB and control reaches the onMessage method.

Here's the code in my onMessage:

public void onMessage(Message message) {
 System.out.println("Hello in onMessage");


 try {
 message.acknowledge();
 System.out.println("Acknowledged msg");
 } catch (JMSException e) {
 System.out.println("exception acknowleding msg");
 e.printStackTrace();
 }

 System.out.println("Sleeping");
 try {
 Thread.sleep(20000);
 System.out.println("Woke up"); } catch (InterruptedException e1) {
 System.out.println("Could not sleep");
 e1.printStackTrace();
 }


 }

I have acknowledged the message by invoking message.acknowledge().
What i am trying to do here is whenever the control reaches the onMessage(i.e. the message is delivered) i want to acknowledge the same so that it WONT be REDELIVERED even if some exception occurs later.


What i tried out was:
Once the control reached onMessage and the "Sleeping" message was displayed on the console, i SHUTDOWN jboss(Note: The onMessage wasnt yet finished since it had gone into sleep). Later i started jboss again.
What i found was the message WAS REDELIVERED and the control reached onMessage again.

What i was expecting was once i acknowledged the message, it should NOT be redelivered irrespective of what happens later in onMessage method.

Can anyone please tell me whether i am doing this right?

Thank you