Tim Bain created AMQ-6098:
-----------------------------

             Summary: Allow clients to NACK a message in INDIVIDUAL_ACKNOWLEDGE 
mode
                 Key: AMQ-6098
                 URL: https://issues.apache.org/jira/browse/AMQ-6098
             Project: ActiveMQ
          Issue Type: Improvement
            Reporter: Tim Bain


Currently, INDIVIDUAL_ACKNOWLEDGE mode allows clients to ack a specific 
message, but not to nack it individually.  The two options (throwing a 
RuntimeException and closing the consumer) will nack all unacked messages, 
which could be problematic if there is never a point where the client can know 
that there are no messages currently being (successfully) processed.

Although the JMS spec doesn't explicitly require implementors to provide such a 
method, that's not to say that we can't go above and beyond the minimum 
functionality required by the spec.  In this case, we should add the ability to 
nack a specific message, which will result in the client removing the message 
from its prefetch buffer and the broker performing a broker-side re-delivery 
(up to the max attempts, after which it will be moved to the DLQ).



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