Just make sure that you download the binary that was built for JDK6: jboss-4.2.3.GA-jdk6.zip View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4223796#4223796 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4223796