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copied!<p>Have you had a read on <a href="http://docs.oracle.com/javase/tutorial/uiswing/misc/systemtray.html" rel="nofollow">How to Use the System Tray</a>?</p> <p>However</p> <p>Check this minimal example:</p> <p>After <code>tray.add(trayIcon);</code> than show your message.</p> <pre><code>import java.awt.AWTException; import java.awt.Graphics2D; import java.awt.SystemTray; import java.awt.TrayIcon; import java.awt.image.BufferedImage; import java.net.URL; import javax.imageio.ImageIO; import javax.swing.SwingUtilities; public class Test { public Test() throws Exception { initComponents(); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { try { new Test(); } catch (Exception ex) { ex.printStackTrace(); } } }); } private void initComponents() throws Exception { createAndShowTray(); } private void createAndShowTray() throws Exception { //Check the SystemTray is supported if (!SystemTray.isSupported()) { System.out.println("SystemTray is not supported"); return; } //retieve icon form url and scale it to 32 x 32 final TrayIcon trayIcon = new TrayIcon(resizeImage(ImageIO.read( new URL("http://www.optical-illusions.in/illusions/blue_rotation_optical_illusion.jpg")), BufferedImage.TYPE_INT_ARGB, 32, 32)); //get the system tray final SystemTray tray = SystemTray.getSystemTray(); try { tray.add(trayIcon); } catch (AWTException e) { System.out.println("TrayIcon could not be added."); } trayIcon.displayMessage("Title", "MESSAGE HERE", TrayIcon.MessageType.ERROR); //THIS IS THE LINE THAT SHOULD SHOW THE MESSAGE } private static BufferedImage resizeImage(BufferedImage originalImage, int type, int IMG_WIDTH, int IMG_HEIGHT) { BufferedImage resizedImage = new BufferedImage(IMG_WIDTH, IMG_HEIGHT, type); Graphics2D g = resizedImage.createGraphics(); g.drawImage(originalImage, 0, 0, IMG_WIDTH, IMG_HEIGHT, null); g.dispose(); return resizedImage; } } </code></pre>

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