Hi Vinay, The 2.5 releases represent minor evolutionary changes from the 2.4 releases, and I'm not aware of any incompatibilities, other than the fact that the coyote invoker (the server side of the Remoting http transport) in the 2.5 releases doesn't work with apache Tomcat, only JBossWeb. Also, I wouldn't expect much of a performance difference. If you discover any contradictions to my suppositions, please let me know. Thanks, Ron View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4243035#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...