Did you try the checklist? That list pretty much covers every NoClassDefFound problem you can have. The nastiest is the one about compiling with an older version. For instance if you compile with JDK 1.5 and run with JDK 1.4, you sometimes get NoClassDefFoundError instead of a class version error. What makes this harder to track down is that the problem might be that a superclass was compiled with JDK 1.5. The error will be reported on the subclass. Stan View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3964489#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...