When tracking messages on the server side you really need to consider the amount of memory required when you have large message volumes. Also when clustered you have to replicate this information since the client may re-send the message on another node. It might be a better solution for the client to keep track and only for the life of their session. This could be done with a client side interceptor. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3977098#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...