MockRemotingCallbackHandler session4Handler = new MockRemotingCallbackHandler();
cm.registerConnectionFactoryCallback("VM1", "Session1", session1Handler);
cm.registerConnectionFactoryCallback("VM1", "Session2", session2Handler);
cm.registerConnectionFactoryCallback("VM2", "Session3", session3Handler);
cm.registerConnectionFactoryCallback("VM4", "Session3", session3Handler);
cfEnd1.addCallback("VM1", "Session1", session1Handler);
cfEnd1.addCallback("VM1", "Session2", session2Handler);
cfEnd2.addCallback("VM2", "Session3", session3Handler);
cfEnd2.addCallback("VM2", "Session4", session4Handler);