Ok, I've solved the problem somehow. The solution was to use the session bean's interface instead of the implementing class: | sdb = (SicherheitsDaten) CTX.lookup("JSF-REACH/SicherheitsDatenBean/local"); | sdb is now of type SicherheitsDaten. SicherheitsDaten is the interface implemented by SicherheitsDatenBean, which I was using before. Now the cast from $ProxyXY works. Cheers, TS View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4009936#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...