Ok. Here it is : http://wiki.jboss.org/wiki/Wiki.jsp?page=JBMHASingleton but it will not work for me, becuase of this: | ... | When running this way you will lose other benefits of JBoss Messaging like automatic failover and distributed destinations. | ... | Anyway, I can not undestand the behaviour of the current JBM. I'm connecting to the master node (ha-jndi) and I have disabled the load balancing of the ClusteredConnectionFactory and sometimes I get Assertion failed, 0 == 0 sometimes Assertion failed, 1 == 1 I think i should alway get : Assertion failed, 0 == 0 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4118690#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...