Difference between a persistent messages  and non persistent messages in JM

Hi
This question is with respect to persistent messages , and non persistent messages .
As per the docs it says that for persistent messages the QueueSender.send() blocks until it recivies an acknowledgement .
Here my question is what is the difference between a persistent messages , and non persistent messages
Thanks in advance .

The exact behaviour depends on the JMS provider being used. But since non-persistent messages are defined to be unreliable, the provider may indeed decide that it's not necessary for the server to acknowledge the receipt of a non-durable message from a producer.
Nigel

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