SKUARCH

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la siguiente aplicacion es un ejemplo de SystemTray con java, esta funcionalidad fue incorporada en java SE 6

Este es un ejemplo basado en un codigo de oracle

import java.awt.Image;
import java.awt.MenuItem;
import java.awt.PopupMenu;
import java.awt.SystemTray;
import java.awt.Toolkit;
import java.awt.TrayIcon;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener; java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

public class SystemTrayTest {

    private TrayIcon trayIcon = null;

    public SystemTrayTest() throws Exception {

        if (SystemTray.isSupported()) {

            SystemTray tray = SystemTray.getSystemTray();
            Image image = Toolkit.getDefaultToolkit().getImage("tray.png");

            MouseListener mouseListener = new MouseListener() {

                public void mouseClicked(MouseEvent e) {
                    System.out.println("Tray Icon - Mouse clicked!");
                }

                public void mouseEntered(MouseEvent e) {
                    System.out.println("Tray Icon - Mouse entered!");
                }

                public void mouseExited(MouseEvent e) {
                    System.out.println("Tray Icon - Mouse exited!");
                }

                public void mousePressed(MouseEvent e) {
                    System.out.println("Tray Icon - Mouse pressed!");
                }

                public void mouseReleased(MouseEvent e) {
                    System.out.println("Tray Icon - Mouse released!");
                }
            };

            ActionListener exitListener = new ActionListener() {

                public void actionPerformed(ActionEvent e) {
                    System.out.println("Exiting...");
                    System.exit(0);
                }
            };

            PopupMenu popup = new PopupMenu();
            MenuItem defaultItem = new MenuItem("Exit");
            defaultItem.addActionListener(exitListener);
            popup.add(defaultItem);

            trayIcon = new TrayIcon(image, "Sistema de alarmas ConQuest", popup);

            ActionListener actionListener = new ActionListener() {

                public void actionPerformed(ActionEvent e) {
                    trayIcon.displayMessage("Alarma",
                            "una alarma se a presentado",
                            TrayIcon.MessageType.WARNING);
                }
            };

            trayIcon.setImageAutoSize(true);
            trayIcon.addActionListener(actionListener);
            trayIcon.addMouseListener(mouseListener);

            //    Depending on which Mustang build you have, you may need to uncomment
            //    out the following code to check for an AWTException when you add
            //    an image to the system tray.

            //    try {
            tray.add(trayIcon);
            //    } catch (AWTException e) {
            //        System.err.println("TrayIcon could not be added.");
            //    }

        } else {
            System.err.println("System tray is currently not supported.");
        }
    }


    public void alertWarining(String title, String message) {
        trayIcon.displayMessage(title, message, TrayIcon.MessageType.WARNING);
    }


    public void alertError(String title, String message) {
        trayIcon.displayMessage(title, message, TrayIcon.MessageType.ERROR);
    }

    public void alertInfo(String title, String message) {
        trayIcon.displayMessage(title, message, TrayIcon.MessageType.INFO);
    }

    public void alertNone(String title, String message) {
        trayIcon.displayMessage(title, message, TrayIcon.MessageType.NONE);
    }
} //end class

la clase SystemTrayTest crea una instancia de TrayIcon y verifica si tiene soporte el sistema operativo. implementa los metodos necesarios y crea un menu para mostrar la salida del programa.

la clase SystemTrayTest contiene los metodos alertWarning(), alertError(), alertNone() y alertInfo() para mostrar mensajes en la pantalla


La clase SystemTrayIcon contiene el metodo principal que crea un objeto de SystemTrayTest, utilizando swingWorker

/**
*
* @author skuarch
*/
public class SystemTrayIcon implements Runnable {

    java.awt.TrayIcon trayIcon;
    java.awt.SystemTray tray;

    /**
     * Construct.
     */
    public SystemTrayIcon() {
        super();
    } //end SystemTrayIcon

    /**
     * @param args the command line arguments
     */
    public static void main(String... args) {
        Thread t = new Thread(new SystemTrayIcon());
        t.start();
    } //end main

    @Override
    public void run() {

        try {
            javax.swing.SwingUtilities.invokeLater(new Runnable() {

                @Override
                public void run() {
                    try {
                        SystemTrayTest stt = new SystemTrayTest();
                        stt.alertWarining("Inicio", "este es un mensaje de inicio");
                    } catch (Exception ex) {
                        System.out.println(ex);
                    }
                }
            });
        } catch (Exception e) {
            System.out.println(e);
            throw new UnsupportedOperationException("Not supported yet.");
        }

    } //end run
} //end class


SystemTrayIcon implementa Runnable y dentro del metodo abstracto se crea el siwngWorker.