The jmx console runs within the app server, so it could be that the java.lang.reflect.Method objects do not have to be serialized. On the other hand, twiddle runs in a separate JVM, thus all objects returned must be serialized. One possible workaround is to get only the property values you need, and not the ones you don't need, such as MethodMap in this case. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4204858#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...