Given how ClientSessionImpl.isSameRM() is written, it will return true only if both sessions share the same *remoting connection to the server*. If you create 2 sessions, they will have separate remoting connections and won't be considered as the same RM by the TM (it thinks JBM allows 8 remoting connection to be created before sharing them) View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4217078#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...