JMS Message Acknowledgement Timeout?

Does message acknowledgement use a timeout?

Is this implementation specific?

So for instance a broker delivers a message and never recieves an acknowledgment...period. At what point does the broker decide eno开发者_JAVA技巧ugh is enough or does it ever?

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Yes, this is implementation specific. A broker can try to redeliver the message several times and then give up (and move the message to a dead letter queue).