I am still having the same problem - the JMS server running out of memory when configured with the mySQL database (4.1.20) too. The behaviour of the program in brief: * the program is time limited - terminates after a time period. So, when the program terminates, there are still lots of unconsumed messages in the topic. But the messages are marked as NON_PERSISTENT while sending; Also before terminating the program, all the connections, subscriptions (producer, consumer) and sessions are closed. Messages can be still be found in the database after the program has terminated. * If the same program is run twice over, the JMS server complains of out-of-memory errors. The JVM heap size is 1GB but it should not matter as whatever be the heap size, the problem is bound to occur later. Any work arounds? Thanks Raghu View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3961276#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...