There is this difference between my 2 eclipse installations: For eclipse-jee-europa-fall2 i get the error when i first deploy my project with Run as/run on server But after the server is started i can do a clean in the Jboss server view and all is well. No error and the app is running. It is this clean which does not work with eclipse-jee-europa-winter :-( Eclipse displays an error box when i do the clean Resource '/tre-ejb/build/classes' does not exist. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4134757#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...