Nope, we don't do cluster-wide locking. Instead we use 2PC transactions to maintain integrity across a cluster. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3956928#3956928 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3956928