Java Message Service, 2nd Edition

Unsubscribing Dynamic Durable Subscribers

There may be cases where you want to explicitly unsubscribe a durable subscriber in a client application. To remove a dynamic durable subscription, you can invoke the Session.unsubscribe method:

...
private void exit() {
   try {                
      subscriber.close();
      tSession.unsubscribe("BorrowerA");
      tConnect.close();
   } catch (javax.jms.JMSException jmse){
      jmse.printStackTrace();
   }
   System.exit(0);
}
...

For nondurable subscriptions, calling the close() method on the TopicSubscriber class is sufficient. For durable subscriptions, there is an unsubscribe(String name) method on the TopicSession object, which takes the subscription name as its parameter. This informs the JMS provider that it should no longer store messages on behalf of this client. You cannot call the unsubscribe() method without first closing the subscription (you will get an exception if you do this). Hence, both methods need to be called for durable subscriptions.