TabularData channels = _mbean.channels();
CompositeData chan4result = channels.get(new Integer[]{4});
assertNotNull(chan4result);
assertEquals("Flow should not have been blocked", false, chan4result.get(blocking));
channel4.block(queue);
channels = _mbean.channels();
chan4result = channels.get(new Integer[]{4});
assertNotNull(chan4result);
assertEquals("Flow should have been blocked", true, chan4result.get(blocking));