Fixed by updating to 3.3.1.GA and adding lock="pessimistic" to join. Thanks for your help! View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4269822#4269822 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4269822