Apache ActiveMQ 5.3 - 如何配置队列以拒绝重复的消息？

 <policyMap>
   <policyEntries>
     <policyEntry queue=">" >
       <dispatchPolicy>
          <duplicateMessageDetector />
        </dispatchPolicy>
      </policyEntry>
    </policyEntries>
  </policyMap>
</destinationPolicy>

 <policyMap>
   <policyEntries>
     <policyEntry queue=">" >
       <dispatchPolicy>
          <strictOrderDispatchPolicy />
        </dispatchPolicy>
        <deadLetterStrategy>
          <individualDeadLetterStrategy processExpired="true" processNonPersistent="true" />
        </deadLetterStrategy>
      </policyEntry>
    </policyEntries>
  </policyMap>
</destinationPolicy>

String messageId = message.getJMSMessageID();
if (duplicateMessageDetector.isDuplicate(messageId)) {
  // 拒绝重复的消息
  return;
}