Ok, let me try and gues what the question is asking, and attempt an answer: If you are sending messages via an XASession, and the XASession's XAResource instance has been enlisted in a global tx, then the messages will actually be sent when the XAResource receives a "commit" from the transaction manager. This will occur either when you call commit() on a UserTransaction, if you are using a UserTransaction, or if you are in a managed environment and are using container managed transactions (CMT), e.g. you are in an ejb method which where a transaction was started when the method began, and is committed when the method exits. It can also occur if you have manually enlisted the XAResource in a JTA gloabl tx which you have created and manually called commit on. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3968700#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...