Re: [Wrapper-user] Auto-updating JREs corrupting themselves

[Leif M. <lei...@ta...>]

Jason,
The Professional Edition has a way to execute a script before
launching the JVM.  You could use that opportunity to copy a fresh
copy of the java.exe over to MyProgram.exe so you make sure you always
have the correct file.

I have not played with the auto update feature in the past.  How is it
triggered?  Is it automatic?  I would think that any JVMs need to be
stopped before updating their files.  Is that the case?

If I understood how you made use of this a little better, it may be
possible to get make the Wrapper support these JVM updates more
directly.

Cheers,
Leif



On Sat, Nov 7, 2009 at 12:00 AM,  <Jas...@sc...> wrote:
>
> Hi,
>
> This isn't solely related to wrapper processes, but I've had a lot of hassle
> with Sun's auto-updating mechanism trashing the installed JRE on Windows.
>
> You end up with:
>
> C:\>java -version
> Error occurred during initialization of VM
> java/lang/NoClassDefFoundError: java/lang/Object
>
> It seems to be the fact that I am using the Invocation API
> (http://java.sun.com/j2se/1.4.2/docs/guide/jni/spec/invocation.html), mostly
> so that users see "MyProgram.exe"  rather than "java.exe" in the task
> manager. The wrapper calls my executable which parses all arguments
> similarly to java.exe but creates its own VM. Unfortunately the installer
> doesn't notice that my program is running and merrily installs, trashing
> itself in the process.
>
> Anyone else suffered similarly? Any known workarounds?
>
> Jason Chown
> Sony Computer Entertainment Europe Limited
> http://eu.playstation.com
>