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    <p>Your description is a hard to follow, and I <em>don't</em> think it's a language issue. My best understanding is that your producer is blocking because the consumer takes a long time to process the message. If true, this implies that you're using durable messages and explicit acknowledgment after processing the message.</p> <p>And if that's the case, the two possible solutions are: (1) decide whether you really need the guarantees and use implicit acknowledgment and/or non-durable messages if not, or (2) reliably store the message in the consumer, acknowledge, and then process the message.</p> <hr> <p>Based on your edits, the short answer is "yes, you can spawn threads." Since the producer doesn't care whether the consumer is able to actually process the message, you have a lot of flexibility in how you handle it.</p> <p>I suspect that ActiveMQ has some property that would allow you to control the number of message-processing threads. I haven't used it extensively (prefer HornetQ), so can't give a definitive answer.</p> <p>However, even if it does, I'd prefer using a Java <code>ThreadPoolExecutorService</code> (I think that's the name of it; see <code>java.util.concurrent</code>). The main reason is that it provides its own internal work queue. No matter how many threads you give to the messaging framework, there's always the possibility that you'll have enough work to tie them up. With the <code>ExecutorService</code>, you will continue to receive and queue messages until you run out of memory (and if that happens, you have some design issues to resolve).</p>
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    1. POLong traitement in a onMessage() : How to handle ? I want this method to be called by a thread
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    1. COHi, a rogue chrome plugin has deleted all the "a" and "the" in my post. Fun bugs. :) I have edited my question, i hope it's more clear now
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      1. USAntoine Claval
    2. CO@Antoine - the edits provided useful information, particularly edit #2. Answer updated accordingly.
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    3. COthanks for your edit. Actually, i'm already using a Executor on the consumer side to handle timeout and long process time. But i'm not really confortable with this solution, for my understanding, it should be the JMS providers responsability. I will look for a "numberOfMessageProcessingThread" config value in activeMq.
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