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Yes, messages from a given producer, with the same priority and delivery mode, and from a given topic, will be delivered in the order they were sent. This is a JMS requirement.
Warning: This is only true with openMQ if you have exactly one consumer. Multiple consumers will be out of order due to the consumer buffers...
In 4.5 with 6727929 fix, one can set imqConsumerFlowLimitPrefetch=false, a new connection factory property, to indicate that no prefetch additional message from broker for Consumer.receive()