[prioritizedMessages, JDBC store] periodically messages on queue cannot be consumed when using broker side prioritizedMessages

When prioritizedMessages=true using JDBC persistent adapter set on the broker; periodically messages are "trapped" on the queue and cannot be consumed. The symptoms:

• JMX queue size shows messages on the broker.
• Browsing the queue shows no messages.
• Messages are in the underlying DB.
• No message can be consumed from the queue.

-This behaviour only seems to occur when using the JDBC persistence store (kahadb does NOT demonstrate the issue)

Example config
~~~
<destinationPolicy>
<policyMap>
<policyEntries>
<policyEntry queue=">" producerFlowControl="false" useCache="true" prioritizedMessages="true" expireMessagesPeriod="0" memoryLimit="1 mb"/>
</policyEntries>
</policyMap>
</destinationPolicy>
~~~