The failure is still present. And my try to fix it with setting the classloader doesn't work in all cases. In some cases the currentThread - ClassLoader is used instead of the default one. To fix that I wrote my own Marshaller that wraps the incoming ObjectInputStream to take aware of the ClassNotFoundException but the VersionAwareMarshaller does not use the set Marshaller. The Method getMarshaller always creates a new CacheMarshaller200 if you have set a custome one. I don't think this is the way configuration should work. I'm stuck now. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4172225#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...