Hi Justin,

I would like to request for the following fix to be included in 0.16.
Alex reviewed the change before I commited it (updating the JIRA was
just waiting for additional testing, now added) and I also discussed
the issue with Rob, they should hopefully be happy to pipe up to that
effect in the morning :)

QPID-3927: Java Broker Priority Queue dispatch not working correctly
https://issues.apache.org/jira/browse/QPID-3927

The result of the defect is that messages may get 'stuck' on a
priority queue until such time as a new consumer subsequently
subscribes to the queue or sometimes higher priority messages arrive,
after either of which points an entirely new set of messages can then
potentially get stuck. Repeat.

The actual defect I fixed has been present for a while, but we appear
to have exposed it more with a specific change made since 0.14. The
update is pretty trivial in the end and is isolated in the priority
queue implementation, meaning it is fairly low risk and actually only
affects something that is otherwise going to be broken anyway.

Robbie

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