Either use JBoss AS 4.0.4 with the JDK 4 Or keep your JBoss AS 4.2.1 with JDK 5 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4071540#4071540 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4071540