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JMS acknowledgement modes

 
Mark Washington
Greenhorn
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Hi,

I am trying to understand the JMS acknowledgment modes and I have three basic questions.

1.Who requests for an acknowledgement is it the consumer or the producer?
2.What does it mean that the client session has been acknowledged?
3.In DUPS_OK_ACKNOWLEDGE Mode, why is it that a message may be redelivered to the client again?

Many Thanks

Mark
 
It is sorta covered in the JavaRanch Style Guide.
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