I have seen this problem come up many times in different guises. What we're really talking about here is some kind of "sticky" thread pool executor. Where you have a pool of threads to service requests, but consecutive invocations can have an affinity for a particular thread depending on some key (this corresponds to the "session id"). I'm kind of surprised j2se doesn't already contain something that can do this. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4140647#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...