Another thing we could do is to provide duplicate message detection only for the lifetime of a particular session. The user could create a session with a special parameter, and then the server would ensure no duplicates were sent by consulting a cache of ids in memory. Since it's in memory no persistence would be required, basically it would just be an extra hashmap lookup. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3977286#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...