Thanks a lot, this solves the problem, the failure was on my side. But still I do not understand this fully. It is true that the beans do not explicitly implement the default business interface, so I thought since the server says it registered that interface it would provide some kind of automatic interface / stub to that bean. Shouldn't I get an exception when trying to lookup an interface that does not really exist? Or at least, when narrowing to a particular existing interface? Anyhow, this helps me a lot, thanks again, -Rainer View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4241075#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...