I found out what was wrong. In the build path there was a reference to a JBoss EJB3 Library. That library was based on a server configuration that didn't exist. Solution:- disable JBossAS Tools; | - remove JBoss EJB3 Library from build path; | - enable JBossAS Tools; | - add JBoss EJB3 Library based on correct Server configuration to build path. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4130319#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...