Launch java app (jar) from c++

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carsten.marx@gmail.com - 02 Nov 2005 13:31 GMT

Hello,
i a little newbie to C++. So sorry for some stupid questions.

The following scenario:
We have a java application running on 200 pcs in a network enviroment.
If a user starts the app the complete jre has to be loaded from a
mounted network volume. This took about 20 to 40 sec. We cannot change
this...
So currently i'm trying to write a splash screen which is showing the
user that something is going on.
The splash screen is implemented. Now my question. Is there an easy way
to lauch a jar as a process from c++ in that way that the splash screen
waits until the java app is started?
Are ther tutorials in the web available?

Thanks for any help.

Regards,
Carsten
University of Konstanz

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Andrew Thompson - 02 Nov 2005 13:48 GMT

> The following scenario:
> We have a java application running on 200 pcs in a network enviroment.
> If a user starts the app the complete jre has to be loaded from a
> mounted network volume. This took about 20 to 40 sec. We cannot change
> this...

This description screams 'Webstart' to me.

It can ensure the end user has the necessary Java installed then
reference it off the client file-system (for much quicker
subsequent start-up).

> So currently i'm trying to write a splash screen which is showing the
> user that something is going on.

And you can include a splash image, though it will be largely
redundant here because ..
a) the splash does not show the first time (e generic
splash is used)
b) second and subsequent start-ups should be quite fast.

HTH

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Roedy Green - 02 Nov 2005 14:54 GMT

>Is there an easy way
>to lauch a jar as a process from c++ in that way that the splash screen
>waits until the java app is started?

If you are familiar with C exec, the launch part is a one liner.

if you try to launch a jar or jnlp, you must launch a command
processor. If you launch java.exe make sure to include the .exe.

See http://mindprod.com/jgloss/javawebstart.html#CD
for a C++ launcher called Setup.exe I wrote for launching Java from
CD. It is considerably more complicated than you need. Just strip out
the irrelevancies.

Signature

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

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Alun Harford - 02 Nov 2005 15:25 GMT

> Hello,
> i a little newbie to C++. So sorry for some stupid questions.
[quoted text clipped - 6 lines]
> So currently i'm trying to write a splash screen which is showing the
> user that something is going on.

webstart

Alun Harford

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Launch java app (jar) from c++

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