Sorry, I did not notice your reply earlier. anonymous wrote : big problem! I have an dead line close to January =( | Any suggestions? how can I contour this problem? Actually, in the EJBTHREE-1118 bug report there's a mention of the fix: anonymous wrote : org.jboss.ejb3.session.BaseSessionRemoteProxy: static final long serialVersionUID = 8310915813626447181L; I guess, you can change the BaseSessionRemoteProxy java file and compile it and patch it in your server. You can give that a try, until 4.2.3 is available. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4115251#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...