GUI receiving log messages from JMS

Question

Hi,
I have three classes: GUI, EventListener and JMSListener. What I want to do is to create a login dialog. The user enters his username and password, presses the login button and waits (as this process can take a while). While waiting, he can see log messages sent via JMS.
I set up a TextListener (in my case a JMSListener) and a subscriber like it is described here: http://java.sun.com/products/jms/tutorial/1_3_1-fcs/doc/client.html#1027256.
But the JMSListener never gets any message although the connection is set up correctly (this is just a guess as no exception is thrown). I think that this is a GUI problem. Because if only the JMSListener is running, it does receive messages. Is it possible that the GUI blocks somehow?
Here is some code... First the class that holds the main method:
package de.dtnet.client.run;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import de.dtnet.client.gui.SWDemoGUI;
import de.dtnet.client.listener.SWDemoEventlistener;
public class SWDemoClient {
    private static SWDemoGUI swdemo = null;
     * @param args
    public static void main(String[] args) {
        swdemo = new SWDemoGUI();
        SWDemoEventlistener listener = new SWDemoEventlistener(swdemo);
        swdemo.registerEventlistener(listener);
}The code from the GUI (only the important parts):
package de.dtnet.client.gui;
import de.dtnet.client.listener.SWDemoEventlistener;
public class SWDemoGUI extends JFrame implements Serializable {
    private static final long serialVersionUID = 1L;
     * Default constructor
    public SWDemoGUI() {
        initialize();
     * Creates widget objects and puts everything together
    public void initialize() {
        // GUI with JTextPane for log messages
    public void logOK(String msg) {
        log(OK, msg);
    public void logInfo(String msg) {
        log(INFO, msg);
    public void logWarning(String msg) {
        log(WARNING, msg);
    public void logError(String msg) {
        log(ERROR, msg);
    public void log(String level, String msg) {
        StyledDocument doc = messagesTextPane.getStyledDocument();
        try {
            doc.insertString(doc.getLength(), msg + "\n", doc.getStyle(level));
        } catch (BadLocationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        messagesTextPane.setCaretPosition(doc.getLength());
    public void registerEventlistener(SWDemoEventlistener listener) {
        loginBtn.addActionListener(listener);
        usernameTxt.addFocusListener(listener);
        passwordField.addFocusListener(listener);
}The enventlistener:
package de.dtnet.client.listener;
// imports
public class SWDemoEventlistener implements ActionListener, FocusListener {
    private SWDemoGUI gui = null;
    private String logLevel = null;
    private String logMessage = null;
    private TopicConnectionFactory conFactory = null;
    private TopicConnection connection = null;
    private TopicSession topicSession = null;
    private Topic topic = null;
    private TopicSubscriber subscriber = null;
    public SWDemoEventlistener(SWDemoGUI gui) {
        this.gui = gui;
        initJMS();
    private InitialContext getInitialContext() {
        // set the properties for the InitalContext
        Properties env = new Properties( );
        env.put("java.naming.provider.url",
                "jnp://localhost:1099");
        env.put("java.naming.factory.initial",
                "org.jnp.interfaces.NamingContextFactory");
        env.put("java.naming.factory.url.pkgs", "org.jnp.interfaces");
        try {
            // initalize and return the InitalContext with
            // the specified properties
            return new InitialContext(env);
        } catch (NamingException ne) {
            System.out.println("NamingException: " + ne);
        return null;
    private void initJMS() {
        try {
            // Obtain a JNDI connection
            InitialContext jndi = getInitialContext();
            Object ref = jndi.lookup("ConnectionFactory");
            // Look up a JMS connection factory
            conFactory = (TopicConnectionFactory) PortableRemoteObject.narrow(
                    ref, TopicConnectionFactory.class);
            // Create a JMS connection
            connection = conFactory.createTopicConnection();
            // Create a JMS session objects
            topicSession = connection.createTopicSession(
                    false, Session.AUTO_ACKNOWLEDGE);
            // Look up a JMS topic
            topic = (Topic) jndi.lookup("topic/testTopic");
        } catch (NamingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (JMSException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == gui.getLoginButton()) {
            // Do some authentication stuff etc.
            /* Now awaitening messages from JMS */
            subscribe(sessionID);
    public void subscribe(Long sessionID) {
        String selector =  "SessionID='" + sessionID.toString() + "'";
        gui.logInfo("Selector: " + selector);
        try {
            //subscriber = topicSession.createSubscriber(topic, selector, true);
            subscriber = topicSession.createSubscriber(topic);
            JMSListener listener = new JMSListener(gui);
            subscriber.setMessageListener(listener);
            connection.start();
            gui.logOK("Verbindung zu JMS erfolgreich");
        } catch (JMSException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
}and finally the JMSListener:
ackage de.dtnet.client.listener;
public class JMSListener implements MessageListener {
    private SWDemoGUI gui = null;
    private String logLevel = null;
    private String logMessage = null;
    public JMSListener(SWDemoGUI gui) {
        super();
        this.gui = gui;
    public void onMessage(Message incomingMessage) {
        System.out.println("You got message!");
        try {
            MapMessage msg = (MapMessage) incomingMessage;
            logMessage = msg.getString("Message");
            logLevel = msg.getString("Level");
        } catch (JMSException e) {
            e.printStackTrace();
        Runnable logTopicMessage = new Runnable() {
            public void run() {
                System.out.println("Now updating the GUI");
                gui.log(logLevel, logMessage);
        SwingUtilities.invokeLater(logTopicMessage);
        System.out.println("Message fully retrieved!");
}I spent a whole day on this and I'm really becoming desperate as I can't see where the problem is and my time is running out (this is for my diploma thesis)! Does anyone of you? Please!
Thank you!
-Danny

Answer 1

Hello Veronica4468,
After reviewing your post, I have located an article that can help in this situation. It contains a number of troubleshooting steps and helpful advice concerning Messages and SMS:
iOS: Troubleshooting Messages
http://support.apple.com/kb/ts2755
Thank you for contributing to Apple Support Communities.
Cheers,
BobbyD