Looks like you compiled your code with the 1.5 JDK and are now trying to run it with the 1.4.2 JVM. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3966182#3966182 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3966182