I think I may spot the problem after reviewing my build.xml -- I was linking to libraries in 4.0.4 where you can find jboss-ejb3x.jar which contains javax.annotations.EJB. In 4.0.5 javax.annotations.EJB is nowhere to be found. Where is it? I haven't confirmed that this is the problem, because I haven't yet managed to compile against 4.0.5. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4036478#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...