Java SE (Java Platform, Standard Edition)

Good Morning-

I'm using the java.awt.SystemTray and TrayIcon classes from 1.6 to create a system tray that acts essentially as a temperature monitor. It's very little code. When I test it from Eclipse, it works great. When I double-click the .jar on my workstation, it works great. When I launch it with java -jar temp.jar, it works great. When I launch it with javaw -jar temp.jar, I get no tray icon, but javaw sits in memory doing something.

When my users launch it with a .vbs that calls java -jar temp.jar and hides the resulting terminal window, they get no tray icon. When they call java -jar temp.jar, they get the tray icon... and the console window. When they call javaw -jar temp.jar, they get no tray icon. Any of these practices yields a java process sitting in memory.

When my users double-click the .jar file, they're asked to chose what to open it with. If they chose Java's executable, it says it doesn't know what to do (it isn't called with -jar). Windows doesn't see their jar files as executables like on mine.

So I have two issues. The result is the system tray icon won't display on users' computers without a window to accompany it. Any idea why? Is it potentially a bug?

Some code:

public class SysTrayController {
	// The actual icon that will be updated
	private TrayIcon		icon;
	
	// The last-set temperature
	private int				temp;
	
	// The box that may or may not appear
	private AlertBox		box;
	
	// No Data received (yet?)
	public final static int NO_DATA = 0;
	
	// High temperature threshold.  TODO:  Make this user-configurable.
	private final static int	HIGH_TEMP = 80;
	
	// ... you guess
	private final static String DEFAULT_ICON =  "icons/default.png";
	
	/**
	 * Initiate everything.  Grab the system tray, plop the icon in it, and
	 * get the icon all set up and ready to go with the default image.
	 */
	public SysTrayController() {
		box = new AlertBox();
		
		SystemTray tray = SystemTray.getSystemTray();
		Image image = Toolkit.getDefaultToolkit().getImage(getClass().getResource(DEFAULT_ICON));
		
		PopupMenu popup = new PopupMenu();
		MenuItem exit = new MenuItem("Exit");
		exit.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				System.exit(0);
			}
		});
		popup.add(exit);
		
		icon = new TrayIcon(image, "Temperature Monitor", popup);
		// On double-click, display the alert box
		icon.addMouseListener(new MouseAdapter() {
			public void mouseClicked(MouseEvent e) {
				if (e.getClickCount() >= 2) {
					box.setVisible(true);
				}
			}
		});
		
		try {
			tray.add(icon);
		} catch (AWTException e) {
			System.out.println(e);
		}
	}
	
	/**
	 * Set the temperature.
	 * 
	 * Call setIcon() to set the icon to the right number, update the alert
	 * box, and if it's time to, display the alert box.
	 */
	public void setTemp(int temp) {
		if (this.temp != temp) {
			this.temp = temp;
			setIcon(temp);
			icon.setToolTip(temp + " degrees");
			
			box.setAlertMessage("Temperature in the Server Room is at " + temp + " degrees!");
			box.setIcon(icon.getImage());
			if (temp > HIGH_TEMP) {
				box.setVisible(true);
				icon.displayMessage("Alert", "Temperature in the server room is at " + temp + " degrees!", TrayIcon.MessageType.WARNING);
			} else if (temp != NO_DATA){
				box.setVisible(false);
			}
		}
	}
	
	/**
	 * Figure out which icon to set the tray icon to, scale it down, and
	 * set it.
	 */
	public void setIcon(int number) {
		Image image = null;
		
		if (number == NO_DATA) {
			image = Toolkit.getDefaultToolkit().getImage(getClass().getResource(DEFAULT_ICON));
		} else if (number >= 60 && number < 100 ) {
			String iconString = "icons/temp";
			iconString += number;
			iconString += ".png";
			try {
				image = Toolkit.getDefaultToolkit().getImage(getClass().getResource(iconString));
			} catch (NullPointerException e) {
				image = Toolkit.getDefaultToolkit().getImage(getClass().getResource(DEFAULT_ICON));
			}
		}
		image = image.getScaledInstance(16, 16, Image.SCALE_SMOOTH);
		icon.setImage(image);
	}
	
	/**
	 * Give back the current temperature.
	 */
	public int getTemp() {
		return temp;
	}
}

The main() that calls it looks like this:

	public static void main(String[] args) {
		SysTrayController controller = new SysTrayController();
		Thermometer temp = new Thermometer(HOSTNAME);
		
		while (true) {
			controller.setTemp(temp.getTemp());
			try {
				if (controller.getTemp() == SysTrayController.NO_DATA) {
					Thread.sleep(1000);
				} else {
					Thread.sleep(SLEEPTIME);
				}
			} catch (Exception e) {
				System.out.println(e);
			}
		}
	}