Java EE: Browsing message queues without removing messages

JMS provides a way to browse message queues without actually removing the messages from the queue. The following example illustrates how to do this:

import java.util.Enumeration;

import javax.annotation.Resource;

import javax.jms.ConnectionFactory;

import javax.jms.JMSContext;

import javax.jms.JMSException;

import javax.jms.Queue;

import javax.jms.QueueBrowser;

import javax.jms.TextMessage;

public class MessageQueueBrowser {

@Resource(mappedName = "jms/GlassFishBookConnectionFactory")

private static ConnectionFactory connectionFactory;

@Resource(mappedName = "jms/GlassFishBookQueue")

private static Queue queue;

public void browseMessages() {

   try {

       Enumeration messageEnumeration;

       TextMessage textMessage;

       JMSContext jmsContext = connectionFactory.createContext();

       QueueBrowser browser = jmsContext.createBrowser(queue);

       messageEnumeration = browser.getEnumeration();

       if (messageEnumeration != null) {

           if (!messageEnumeration.hasMoreElements()) {

                System.out.println("There are no messages " + "in the queue.");

       } else {

                System.out.println("The following messages are " + "in the queue");

                while (messageEnumeration.hasMoreElements()) {

                          textMessage = (TextMessage)

                          messageEnumeration.nextElement();

                          System.out.println(textMessage.getText());

                }

       }

     }

     } catch (JMSException e) {

         e.printStackTrace();

     }

}