I reverted the default and have the MessageDrivenContainer selecting the old default now, and the MDBUnitTestCase is passing. Still seeing another related error where the null class is not being dealt with correctly that I'm looking at: | 10:37:46,996 ERROR [AbstractKernelController] Error installing to Start: name=jboss.j2ee:binding=message-inflow-driven-bean,jndiName=local/SubclassMDB@1556357403,plugin=invoker,service=EJB state=Create mode=Manual requiredState=Installed | org.jboss.deployment.DeploymentException: Could not load messaging-type class null | at org.jboss.deployment.DeploymentException.rethrowAsDeploymentException(DeploymentException.java:52) | at org.jboss.ejb.plugins.inflow.JBossMessageEndpointFactory.resolveMessageListener(JBossMessageEndpointFactory.java:295) | at org.jboss.ejb.plugins.inflow.JBossMessageEndpointFactory.startService(JBossMessageEndpointFactory.java:193) | at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:299) | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4096222#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...