code: public static String pingJmsBackoutQueue(MuleContext muleContext, String queueName) {
  		return pingJmsBackoutQueue(muleContext, DEFAULT_MULE_JMS_CONNECTOR, queueName);
  	}
docs: Verify access to a JMS backout queue by browsing the backout queue and ensure that no messages exists.
  
  @param queueName
  @return