By using the following code an image can be added to the system Tray.

 public class systemTray {

  public static void main(String[] args) {

    Display display = Display.getDefault();
    Tray tray = display.getSystemTray();
    TrayItem item = new TrayItem(tray, 0);
    Image img = new Image(display, "c:\\picture.jpg");
    Item.setImage(img);
    Item.setToolTipText("SWT Tray in action");

  }
}