Re: jvm crash

"John B. Matthews" <nospam@nospam.invalid>
Mon, 06 Jul 2009 11:18:43 -0400
In article
 suru <> wrote:

my observation is that, suddenly, my applet (& its child windows)are
gone, and i find jvm crash log file, explaining the details.

Can you supply an example that demonstrates your problem? Here is an
example of an applet crashing the Event Dispatching Thread:

//<applet code="Hello.class" width=400 height 0></applet>
import java.applet.*;
import java.awt.*;
import javax.swing.*;

public class Hello extends JApplet {
    private static final Font font = new Font("Serif", Font.BOLD, 24);
    private static final String s = "Hello World!";
    public void init() {
    public void paint(Graphics g) {
        int xx = this.getWidth();
        int yy = this.getHeight();
        int w2 = g.getFontMetrics().stringWidth(s) / 2;
        int h2 = g.getFontMetrics().getDescent();
        g.fillRect(0, 0, xx, yy);
        g.drawString(s, xx / 2 - w2, yy / 2 + h2);
        int evil = 1/0; // line 22
    public void destroy() {
        System.out.println("That's all, folks...");

Java Plug-in 1.5.0
Using JRE version 1.5.0_19 Java HotSpot(TM) Client VM
User home directory = /Users/...
Exception in thread "AWT-EventQueue-2"
  java.lang.ArithmeticException: / by zero
    at Hello.paint(
    at sun.awt.RepaintArea.paintComponent(

Here's is the same error in the debugger:

$ appletviewer -debug
Initializing jdb ...


run sun.applet.Main
Set uncaught java.lang.Throwable
Set deferred uncaught java.lang.Throwable

VM Started: Warning: Temporarily overwriting system property at user's
request: key: http.proxyPort old value: 8118 new value: 8118
Warning: Temporarily overwriting system property at user's request: key:
http.proxyHost old value: new value:
Exception in thread "AWT-EventQueue-1" java.lang.ArithmeticException: /
by zero
    at Hello.paint(
    at sun.awt.RepaintArea.paintComponent(

evernthough i have log file, can u explain difference between app
crashing and the JVM crashing"?


John B. Matthews
trashgod at gmail dot com

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