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I want to use a QueueSender in a multi-threaded environment.
Is QueueSender.send() thread safe?
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As far as I know from the Java side, the connection is thread safe (and rather expensive to create) but Session and messageProducer are not thread safe. Therefore it seems you should create a Session for each of your threads.
Using Final keywordFinal Variables are also thread-safe in java because once assigned some reference of an object It cannot point to reference of another object.
No, a MessageProducer/QueueSender is not thread safe.
Or more specifically: The Session is not thread safe. The JavaDoc for Session explicitly mentions this in its first sentence:
A Session object is a single-threaded context for producing and consuming messages.
And since a MessageProducer/QueueSender is bound to a Session you must not use it from more than one thread at the same time. In fact you must not use it from two different threads at different times either!
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