Thanks for your reply. I configured properly.i alreay configured my ejb clustering, tree cachee .. working finely. JBM examples are working fine except the failover queue & distributed queues . I dont know what i did wrong. I couldn't find actual problem in my configuration. What is mean of RuntimeException:Assertion failed, 2 == 2 ? Please help me .. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4135768#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...