Problem in Closing Browser window from an Applet.

Question

I have wriiten a small Applet progarm that calls a Javascript function in the opening window, to close the window in which it is loaded.The Applet window is a PopUp window from one of my application's window.
First time I start my application and load that Applet and then close the frame window,it works fine that the browser window will close, when the frame window is closed.It calls the window closing event in that applet stop method is called and In stop methd a closeLaunchedBrowser method will called this has a Javascript method and the Method closes the window using the self.close() method.
But now if I continue this process of launching applet and then closing frame window, initial 1 or 2 steps it has know problem when I continue this, after 3 or 4 steps, it result in browser hang/crash.
I am using java version 1.4.2_01 or higher and IE or Firefox(any other NetScape based) browser to load applet.It works fine with IE but getting problem in case of Firefox(any other NetScape based).
The error dialog information and related event log generated is shown below :
The dialog which is displayed before crashing of firefox has information :
"firefox.exe has generated errors and it will closed by windows.you will need to restart the program.
An error log is being created."
The error log information :
Source : Browser Event ID: 8032
"The browser service has failed to retrieve the backup list too many times on transport \Device\NetBT_Tcpip_{611A64A2-8F4B-409E-9AB2-0D9BF741E791}. The backup browser is stopping.
The code related to this is given below.
import javax.swing.JApplet;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import netscape.javascript.JSObject;
public class TestApplet extends JApplet {
protected JSObject win = null;
private JFrame frame = null;
private boolean alreadyClosed = false;
public void init(){
this.win = JSObject.getWindow(this);
frame = new JFrame("Test Frame");
frame.setSize(300, 400);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.out.println("windowClosing");
TestApplet.this.stop();
frame.show();
public void stop() {
if (!alreadyClosed) {
alreadyClosed = true;
closeLaunchedBrowser();
System.gc();
System.runFinalization();
private void closeLaunchedBrowser() {
final TestApplet thisObject = this;
Runnable r = new Runnable() {
public void run() {
try {
JSObject win = (JSObject)JSObject.getWindow(thisObject);
if (win != null && win.toString() != null) {
//win.eval("top.opener=self;self.close();");
//win.call("close", null);
win.eval("self.close();");
} catch (Exception e) {
Thread t = new Thread(r);
t.start();
}If any one know solution regarding how to aviod this crash of browser please let me know. I will be very thankful to you.
Thanks.

Answer 1

Right, I sort of tracked down some code that uses getMethods to allow me to invoke a Javascript command. It is not pretty and took a little bit of editing to get to work but it does the job without putting JS stuff into my HTML.
However it is causing some problems. If I open one of my other applets it will only let me close that window and the previous applets ceases to respond at all. I think this may be because the invoke gets the JSObject which is the window and somehow having more than one applet open in different windows is causing it to get confused and is locking the first window and only responding to the second.
I have seen a much simpler method that uses:
import netscape.javascript.*;
and JSObject to get the window but my compiler complains about the import. Any further suggestions or an example would be welcome as my current solution is a bit limited as you can effectively only have one window open at a time which doesn't suit my needs.
Many thanks.
Mark.