We already talked about this privately... so this is just to complete the thread. Jeff pointed me that he was de-serializing when the message was received, instead of when the user/testcase called getObject on the ObjectMessage, what caused StreamUtils to use the wrong classLoader (passed by Thread.currentContextClassLoader()). After Jeff used Lazy serialization the test was fixed. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4118029#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...