Ok, thanks again. It was a long correspondence, but we wanted to be sure that we can always rely on JBM to maintain message ordering (even whilst JBM resolves connection problem by itself behind the scenes). Thats good. One last question :) We realize that our non durable listeners will loose messages whilst they are not connected. That's the nature of non durable subscribtions and that's fine. However, whilst connected, we would like our Listeners to be notified of gaps in the order. In other words we would like JBM to tell us when some kind of connection problem caused messages to be lost. Will JBM always notify our Exception Listener of such gaps? Can you think of a scenario in which gaps occur without notifying our Exception Listener? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4117463#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...