If they are from different hosts, then no. We don't acquire a cluster-wide lock when you invoke the call. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4102860#4102860 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4102860