resolve https://issues.apache.org/activemq/browse/AMQ-2489 - duplicate delivery acks resulted in broker exceptions with client or inividual ack - delivery acks now only for unacked messages - down side is pending messages in broker remain on expiry awaiting ack from ackLaer that dependes on prefetch value - but this is reasonable and to be expected. they will be removed on close or subsequent acks in any event
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activemq/trunk/activemq-core/src/main/java/org/apache/activemq/ActiveMQMessageConsumer.java