ThreadPerSessionEventHandlingStrategy thread not exiting

such thread do not exit on acceptor.stop()

stopDispatcherThreads iterates the collection after it clear()s it apparently so stopDispatcher() is not run on individual threads.

The the run method of ThreadPerSessionEventHandlingStrategy checks for the stopped variable and exits if set to true.
However it uses a blocking queue and if no messages come that variable is not checked so the thread can keep the app from exiting.

In stopDispatcherThreads() we can interupt the thread if the queue is empty. Alternately instead of messages.take() we can use messages.poll()
with a timeout, but than we need to check for null return.