I think the problem is not there, because I can get the Reference to MyBean with ctx.lookup("MyBean/local") The problem is when i try to narrow this with MyBeanLocalInterface i = PortableRemoteObject.narrow(ref, MyBean.class) Propably i'm missing some jar in the classpath. The server i'm using is JBoss. Thanks for the attention! View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4220899#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...