Unfortunately our application works much much faster if it can process say 100 messages in a batch. See below a little snippet of example code: | List<Message> messages = new ArrayList<Message>(maxLimit); | Message msg; | MessageConsumer receiver = session.createConsumer(queue); | while(messages.size() < maxLimit && ( msg = receiver.receive(1000)) != null){ | messages.add(msg); | } | receiver.close(); | //process batch | session.commit(); | I will make sure that I double check GC next time we have this issue as we used to use a hotwired GC in jboss4.0.X before we upgraded to Jboss4.2.2. But I am sure(ish) we've looked and rule GC out. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4135589#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...