Applet Shutdown Problem

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Darol Klawetter - 13 Dec 2005 17:58 GMT

My applet runs in its own window frame after being invoked from a
browser. If I close the applet, the windowClosing event is detected as
it should be. If I close down the browser instead of the applet, then
the applet's windowClosing event is not called even though the applet
closes. I have shutdown code in the windowClosing method and I want
this code invoked whether I close the applet before the browser or the
browser before the applet.

I've tried putting my shutdown code in applet.stop() but the objects I
need for shutdown have already been deallocated and are thus null
values when stop() is invoked.

Any ideas of where I can put my shutdown code?

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Vova Reznik - 13 Dec 2005 18:57 GMT

Read this
http://java.sun.com/docs/books/tutorial/applet/overview/lifeCycle.html

What objects are deallocated?

> My applet runs in its own window frame after being invoked from a
> browser. If I close the applet, the windowClosing event is detected as
[quoted text clipped - 9 lines]
>
> Any ideas of where I can put my shutdown code?

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Darol Klawetter - 13 Dec 2005 19:41 GMT

Thanks for the link, but it doesn't address my problem.

Regarding your question: The deallocated objects are my
application-specific objects, which are primarily java bean objects. It
appears that they are being unloaded before the applet.stop() is issued.

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Alun Harford - 13 Dec 2005 20:30 GMT

> My applet runs in its own window frame after being invoked from a
> browser. If I close the applet, the windowClosing event is detected as
[quoted text clipped - 3 lines]
> this code invoked whether I close the applet before the browser or the
> browser before the applet.

IIRC if somebody closes the browser then they kill the JVM.
I don't think you can do anything about that.

Alun Harford

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Darol Klawetter - 13 Dec 2005 21:14 GMT

I've already added a shutdown hook (i.e.,
Runtime.getRuntime().addShutdownHook()) that should get called before
the JVM exits but, for some reason, it's not getting called in this
case.

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Roedy Green - 13 Dec 2005 22:18 GMT

On 13 Dec 2005 13:14:55 -0800, "Darol Klawetter"
<darol.klawetter@l-3com.com> wrote, quoted or indirectly quoted
someone who said :

>I've already added a shutdown hook (i.e.,
>Runtime.getRuntime().addShutdownHook()) that should get called before
>the JVM exits but, for some reason, it's not getting called in this
>case.

There is a good chance you need to be signed to do that.

Signature

Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

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Darol Klawetter - 14 Dec 2005 02:43 GMT

> On 13 Dec 2005 13:14:55 -0800, "Darol Klawetter"
> <darol.klawetter@l-3com.com> wrote, quoted or indirectly quoted
[quoted text clipped - 9 lines]
> Canadian Mind Products, Roedy Green.
> http://mindprod.com Java custom programming, consulting and coaching.

I've given my applet full permission on my machine via the policy file.
Any other ideas?

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Darol Klawetter - 14 Dec 2005 16:47 GMT

Any other ideas? Anyone?

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Andrew Thompson - 16 Dec 2005 09:00 GMT

> Any other ideas? Anyone?

Browsers cannot be relied upon to call Applet.stop(), it is
that simple. If you need more control, wrap the applet in JWS,
then you have the more predictable AppletViewer showing the applet.

Signature

Andrew Thompson
physci, javasaver, 1point1c, lensescapes - athompson.info/andrew

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Applet Shutdown Problem

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