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Re: Packaging applications with JVM version restrictions

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Hi Gregor,

>From what I've seen of the java-wrappers package, it seems to solve the problem
in a single direction: specifying the minimum JVM's version, but not the maximum.

That was one of the remark of Thorsten to me.

The more I think about it, the more I think it is not a problem which should
be solved by Debian. Nor by Fedora, Nor by Homebrew, ...
I'd like to have a solution that is common for all systems/platform to ease the
packaging of java applications.

So I started a prototype of a program that would choose a JVM based on criteria
like the minimum/maximum java specification version, the vendor of the JVM, the
capabilities of the JVM (java, javac, javap, native-image, ...)

It would consist of two steps:
- JVMs discovery
- JVM selection

I would typically expect the paths/environment variables to use for the discovery
to be OS/package managers specific.
For Debian, it could be /usr/bin/java, /usr/lib/jvm, $JAVA_HOME.
Rules could be specified at system level to say for example: use a JVM in the [11, 17] range.
Those rules could be overridden on a per program basis.

Here is the prototype: https://github.com/loicrouchon/jvm-finder/tree/main#readme
It's written in Go so that the JVM selection is quite fast. I'm more of a
Java developer, so probably not great Go, but I'll improve it over time.

I do not expect any of you to help me with the implementation, but feel free ;)
However, I would love you to contribute to the requirements of such a program.
Because I have the point of view of someone wanting to distribute a Java program.
But I lack the point of view of distributions/packages maintainers

PS: I'll be at Devoxx UK next week and will try to discuss of this topic
with other Java developers.

Regards,

------- Original Message -------
On Thursday, April 20th, 2023 at 19:29, gregor herrmann <gregoa@debian.org> wrote:


> 
> 
> On Wed, 19 Apr 2023 09:48:54 +0000, Loïc Rouchon wrote:
> 
> > Debian would need to provide a way to perform the "JRE with exact java $version exists"
> > check. This could be done by providing stable symlinks, or alternatives like
> > /etc/alternatives/jre_<VERSION>
> 
> 
> (I haven't read the complete thread in detail, so this might be not
> completely appropriate):
> 
> There's also the java-wrappers package which helps to find java
> runtimes from shell wrapper scripts.
> 
> 
> Cheers,
> gregor
> 
> --
> .''`. https://info.comodo.priv.at -- Debian Developer https://www.debian.org : :' : OpenPGP fingerprint D1E1 316E 93A7 60A8 104D 85FA BB3A 6801 8649 AA06` . `' Member VIBE!AT & SPI Inc. -- Supporter Free Software Foundation Europe` -

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Packaging applications with JVM version restrictions Rob Browning <rlb@defaultvalue.org> - 2023-04-17 21:50 +0200
  Re: Packaging applications with JVM version restrictions Thorsten Glaser <t.glaser@tarent.de> - 2023-04-17 22:00 +0200
    Re: Packaging applications with JVM version restrictions Loïc Rouchon <loic@loicrouchon.com> - 2023-04-18 15:30 +0200
      Re: Packaging applications with JVM version restrictions Thorsten Glaser <t.glaser@tarent.de> - 2023-04-19 09:20 +0200
        Re: Packaging applications with JVM version restrictions Loïc Rouchon <loic@loicrouchon.com> - 2023-04-19 12:10 +0200
          Re: Packaging applications with JVM version restrictions gregor herrmann <gregoa@debian.org> - 2023-04-20 20:00 +0200
            Re: Packaging applications with JVM version restrictions Loïc Rouchon <loic@loicrouchon.com> - 2023-05-06 15:40 +0200

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