Prepare the sample IBM MQ stock query application

import javax.jms.JMSConsumer;
import javax.jms.JMSContext;
import javax.jms.JMSProducer;
import javax.jms.Message;
import javax.jms.Queue;
import javax.jms.TextMessage;
import com.ibm.mq.jms.MQConnectionFactory;

/**
 * Simple back end application which generates responses to stock queries.
 */
public class TwoWayBackend {
    public static void main(String[] args) {
        String queueManagerName = args[0];
        String requestQueueName = args[1];
        String responseQueueName = args[2];
		
        try {
            //Connect to queue manager.
            MQConnectionFactory cf = new MQConnectionFactory();
            cf.setQueueManager(queueManagerName);
			
            JMSContext ctx = cf.createContext();
			
            //Connect to request queue.
            JMSConsumer consumer = ctx.createConsumer(ctx.createQueue(requestQueueName));
			
            //Create JMS producer.
            JMSProducer producer = ctx.createProducer();
			
            //Create response queue.
            Queue responseQueue = ctx.createQueue(responseQueueName);
			
            //Loop round getting messages, and generating a response.			
            while(true) {
                System.out.println("Waiting for message. Press Ctrl+C to exit.");
				
                TextMessage requestMessage = null;
        
                //This loop provides a succinct way of breaking out of the loop by pressing Ctrl+C.
                while(requestMessage == null) {
                    requestMessage = (TextMessage) consumer.receiveNoWait();
                    if (requestMessage == null) {
                        Thread.sleep(1000);
                    }
                }
				
                //Request message payload is a 6 digit integer representing an item id.
                String itemID = requestMessage.getText().trim();

                System.out.println("Message received: " + itemID + ".");
				
                //Response message is a 6 digit integer item id, 
                //followed by a 20 character description,
                //a 6 digit integer item count and a 
                //a 6 digit integer item cost.
				
                //Return a hard coded response body, with the itemID inserted.
                String responseMessagePayload = String.format("%sA description.      0005000000045", itemID); 
				
                Message responseMessage = ctx.createTextMessage(responseMessagePayload);
				
                //Response messages have the correlation id set to the message id of the request message.
                responseMessage.setJMSCorrelationID(requestMessage.getJMSMessageID());
				
                //Send response.
                producer.send(responseQueue, responseMessage);		
         }
      }
      catch(Exception e) {
         System.out.println("Caught exception ");
         e.printStackTrace();
      }
    }
}