I doesn't know that JBoss 4.2.0 included Remoting 2.2. Thanks. I have switched back to 2.2.SP4 (replaced the downloaded *remoting*.jar Files from the Remoting 2.0.0 package in the JBoss/server/default/lib Folder with the original ones), but the error Message was the same. Should I try JBoss 4.0.5? Should I post/send my sourcecodes? Thomas View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4052724#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...