thanks to all. solved by upgrading jgroups as mentioned http://jboss.com/?module=bb&op=viewtopic&t=69157 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4064471#4064471 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4064471