Netscape.javascript.JSException: Native Window is destroyed

Question

Supposedly this code closes the window in which the applet is displayed.
try{
     JSObject win = (JSObject) JSObject.getWindow(this);
     win.eval("self.close();");
catch(JSException ex){
     System.out.println(ex.getWrappedException().toString());
catch(Exception ex){
     System.out.println(ex.toString());
}But I am getting "netscape.javascript.JSException: Native Window is destroyed" every time I run it. I Googled this exception, and to my surprise, I got 0 results. Does anyone know what is causing this or how to avoid it?
I tried adding the method "close_window()" to the page, and calling that function with win.eval(), but I get the same error.
The browser in question is Firefox on Windows XP. It is running an applet in a "bare bones" windows, with no toolbars or status bars.

Answer 1

I've never used that exact call, what about a slightly different method:
try{
     JSObject win = (JSObject) JSObject.getWindow(this);
     win.call("close", new Object[0]);
catch(JSException ex){
     System.out.println(ex.getWrappedException().toString());
catch(Exception ex){
     System.out.println(ex.toString());
}