Have you tried with 2.1.0.BETA1? This needs JGroups 2.6.BETA1 as well (packaged with JBoss Cache) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4096917#4096917 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4096917