"rlucente" wrote : I read the JMS spec but I didn't really see the description of a session/message affinity at rollback. | 4.4.7: "... If a transaction rollback is done, its produced messages are destroyed and its consumed messages are automatically recovered. For more information on session recovery, see Section 4.4.11 ”Message Acknowledgment.” And 4.4.11: "A session’s recover method is used to stop a session and restart it with its first unacknowledged message. *** In effect, the session’s series of delivered messages is reset to the point after its last acknowledged message ***. ..." anonymous wrote : | Regardless, sessions are not thread-safe | True. If you do use a session between multiple threads all sorts of strange things might start to happen View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4140565#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...