Have you upgraded JGroups as well, to the version that ships with JBC 3.0.1? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4197783#4197783 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4197783