All you need is to maintain the order of the deliveries relative to a session. It doesn't really matter what thread runs a delivery, whether is the same thread or different thread, as long as the relative order is preserved. "Booking" a thread for each session, while it is a solution that works at a small scale, breaks down when the problem grows in size. As long as you agree with this, solutions can be found. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4156845#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...