while running my mp3 player, it crashed on some songs. Looking into that, it turns out it's not the player itself, but the java TrayIcon class, when I call setToolTip(str) with str.length() == 128.
I wrote a short example to prove what happens:
package jc.javaexceptions;
import java.awt.AWTException;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.SystemTray;
import java.awt.TrayIcon;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.lang.reflect.InvocationTargetException;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
public class Tray_setToolTip {
// testing switches
// if set to true, shows chrash screen
// if set to false, app crashes quietly
static private final boolean SHOW_GUI_FAIL = true;
// does not play a role if run in- or outside EDT
static private final boolean RUN_IN_SWING_DISPATCH_THREAD = true;
/**
* Demonstrates, how setting a 128-char ToolTipText to a TrayIcon will crash the JVM
*/
public static void main(final String[] args) throws AWTException, InvocationTargetException, InterruptedException {
if (SHOW_GUI_FAIL) {
final JFrame f = new JFrame("Test Window, fails at 128 chars ToolTipText length");
f.setBounds(200, 200, 400, 400);
f.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
f.setVisible(true);
}
// create tray image
final int SIZE = 16;
final BufferedImage bi = new BufferedImage(SIZE, SIZE, BufferedImage.TYPE_INT_ARGB);
final Graphics g = bi.getGraphics();
g.setColor(Color.CYAN);
g.fillRect(0, 0, SIZE, SIZE);
g.setColor(Color.RED);
g.drawLine(0, 0, SIZE, SIZE);
g.drawLine(0, SIZE, SIZE, 0);
// set up tray and tray icon
final TrayIcon trayIcon = new TrayIcon(bi);
final SystemTray tray = SystemTray.getSystemTray();
trayIcon.addMouseListener(new MouseAdapter() {
@Override public void mouseClicked(final MouseEvent pE) {
tray.remove(trayIcon);
System.exit(0);
}
});
tray.add(trayIcon);
// works fine
System.out.println("1 OK");
trayIcon.setToolTip("Funny Test!"); // -> OK
setTTT(trayIcon, 127); // try 127 -> OK
setTTT(trayIcon, 129); // try 129 -> OK
setTTT(trayIcon, 128); // try 128 -> CRASH // <--------------------------- CRASH
// will not be reached!
System.out.println("End reached!");
}
static private void setTTT(final TrayIcon pTrayIcon, final int pStringLength) throws InvocationTargetException, InterruptedException {
System.out.println("Tray_setToolTip.setTTT(" + pStringLength + ")");
// construct bad-ass string
final StringBuilder sb = new StringBuilder();
for (int i = 0; i < pStringLength; i++) {
sb.append("1");
}
final String str = sb.toString();
System.out.println("\tString len=" + str.length());
if (RUN_IN_SWING_DISPATCH_THREAD) {
// SwingUtilities.invokeLater(() -> pTrayIcon.setToolTip(str)); // cannot use invokeLater(), would allow the output of "End reached!"
SwingUtilities.invokeAndWait(() -> pTrayIcon.setToolTip(str));
} else {
pTrayIcon.setToolTip(str);
}
System.out.println("\tOK");
try {
Thread.sleep(1000);
} catch (final InterruptedException e) {
e.printStackTrace();
}
}
}
Soooo... does this happen on your PCs too? Or just on mine? I run Oracle jdk-8u40-windows-x64 on an up-to-date Windows 7...
If it turns out this is a Java intrinsic bug, how should I proceed further?
