To empty the Message Queue(IBM MQ). 

Pom.xml entries.

 
  mycompanygrpid
  parent
  0.0.1
 
 4.0.0
 com.test.mqtest
 mymqpom
 1.0.0
 war
 Test MQ
 Test MQ
         
  UTF-8
                 7.0.0.0
  1.0.0.0
 
        
  
  
   middleware
   com.ibm.mq
   ${webSphereMQVersion}
  
  
   middleware
   com.ibm.mq.jmqi
   ${webSphereMQVersion}
  
  
   middleware
   com.ibm.mq.jmqi.remote
   ${webSphereMQVersion}
  
  
   middleware
   com.ibm.mq.jmqi.system
   ${webSphereMQVersion}
  
  
   middleware
   com.ibm.mqjms
   ${webSphereMQVersion}
  
  
  
   middleware
   com.ibm.msg.client.commonservices
   ${webSphereMQClientVersion}
  
  
   middleware
   com.ibm.msg.client.commonservices.j2se
   ${webSphereMQClientVersion}
  
  
   middleware
   com.ibm.msg.client.jms
   ${webSphereMQClientVersion}
  
  
   middleware
   com.ibm.msg.client.jms.internal
   ${webSphereMQClientVersion}
  
  
   middleware
   com.ibm.msg.client.provider
   ${webSphereMQClientVersion}
  
  
   middleware
   com.ibm.msg.client.wmq
   ${webSphereMQVersion}
  
  
   middleware
   com.ibm.msg.client.wmq.common
   ${webSphereMQVersion}
  
  
   middleware
   com.ibm.msg.client.wmq.factories
   ${webSphereMQVersion}
  
  
   middleware
   dhbcore
   DH610-GOLD
  
  
   org.glassfish
   javax.jms
   10.0-b28
  

Actual code to clean up the queue.

  private void emptyIt()  {
        MQQueueManager _queueManager = null;
        MQQueue queue = null;
       int openOptions = MQC.MQOO_INQUIRE + MQC.MQOO_FAIL_IF_QUIESCING + MQC.MQOO_INPUT_SHARED;
       try{
       _queueManager = new MQQueueManager(qManager);         
       queue = _queueManager.accessQueue(inputQName, openOptions, null, null, null);
       System.out.println("EmptyQ: Opened queue "+inputQName);

       int depth = queue.getCurrentDepth();
       System.out.println("EmptyQ: Current depth: " + depth);

       MQGetMessageOptions getOptions = new MQGetMessageOptions();
       getOptions.options = MQC.MQGMO_NO_WAIT + MQC.MQGMO_FAIL_IF_QUIESCING + MQC.MQGMO_ACCEPT_TRUNCATED_MSG;

       MQMessage message;
       while (loopAgain){
   message = new MQMessage();
   try {
      queue.get(message, getOptions, 1);
   }catch (MQException e){
      if (e.completionCode == 1 && e.reasonCode == MQException.MQRC_TRUNCATED_MSG_ACCEPTED) {
          // Just what we expected!!
      }
      else{
         loopAgain = false;
         if (e.completionCode == 2 && e.reasonCode == MQException.MQRC_NO_MSG_AVAILABLE){
     // Good, we are now done - no error!!
         } else {
     System.err.println("EmptyQ: MQException: " + e.getLocalizedMessage());
         }
      }
   }
       } // close of while loop
      System.out.println("EmptyQ: Queue emptied.");
   }catch (MQException e1){
      System.err.println("EmptyQ: MQException: " + e1.getLocalizedMessage());
   }
   finally {
      if (queue != null){
         queue.close();
      }

      if (_queueManager != null){
         _queueManager.disconnect();
      }
   }
  }