ClassNotFoundException and NoClassDefFoundError are two different things are have different meaning. Post the exception stack trace that you are seeing. When you see the NoClassDefFoundError, it may be a case that even the classes in the .jar file(which you placed in the deploy directory) are found by the classloader, there might be other classes/jars which this class is dependent on and which may not be in the classpath. The exception stacktrace will help in identifying the exact reason View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3960300#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...