You must have some notion of NACKs, otherwise how do you handle all the cases that need redeliveries? e.g. An error during a message listener e.g.2. Closing a CLIENT_ACKNOWLEDGE session without acknowledging the messages e.g.3. closing the receiver there is a race condition on the server delivering a message receiver -> I want a message server -> there is none, just wait sender -> send message server -> queue delivery of message receiver -> close() delivery -> Oh! The receiver has vanished -> NACK! etc. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3957409#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...