Now you are confusing me! You said the send to queue was not working, but the message you got is only printed after the send to queue.
I don't know where or how you are using the isAlive, or even which thread that is on.
Maybe the problem is in the thread where your Commserver main method executes (the one where it waits for inbound connections, the only one you don#t start explicitly) rather than any one ConnectionHandler thread.
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