Hermetic Java project meeting

[Jiangli Zhou]

On Tue, May 28, 2024 at 9:09 AM Magnus Ihse Bursie <
magnus.ihse.bursie at oracle.com> wrote:

> On 2024-05-07 06:04, Jiangli Zhou wrote:
>
> I did think I correctly changed every dynamic check that you had added
> to a compile-time check, so it bewilders me somewhat when you say that
> jvm.cfg is not needed in your branch.
>
> Can you verify and confirm that the static launcher actually works in
> your branch, if there is no "lib/jvm.cfg" present?
> In my <path>/leyden/build/linux-x86_64-server-slowdebug/images/jdk directory:
>
> $ mv lib/jvm.cfg lib/jvm.cfg.no_used $ find . | grep jvm.cfg
> ./lib/jvm.cfg.no_used $ bin/javastatic -cp <my_jar> HelloWorld HelloWorld
>
> I was very much mislead by this. I was sure I hade made some mistake when
> I picked out the changes you have made for static builds (and removed all
> the other changes, e.g. for the hermetic jar files), since you said this
> worked for you. I have been scrutinizing the difference between your branch
> and mine, over and over again, without understanding what the difference
> could be.
>
> Finally I did what I should have done at the very beginning, and actually
> tested building and running your branch.
>
> It did not work either.
>
> So why did you claim it worked? I kept digging, and I found out the
> reason. You had indeed implemented a fix for this, but only on Linux. I was
> testing on macOS. (It is also not implemented for Windows, but since I'm
> still struggling to find a way to create proper static builds there it is
> less of a problem for now.)
>
> My branch worked just as well as your on Linux. I have now fixed so it
> works on macOS too. With this hurdle out of the way, I can get back to
> doing real work on the patch. Unfortunately this detour took far too much
> time. :-(
>

Mystery solved! Yes, our prototype was for linux-x64 only (communicated in
https://mail.openjdk.org/pipermail/leyden-dev/2023-February/000106.html and
our discussion meetings). I think I was not clear that you were testing on
macOS.

The supported platform was also discussed in the hermetic Java meetings. My
understanding was that we can focus on Linux (or unix-like) initially.
Let's get the initial integration point support for Linux. Glad to see that
you are making progress! Please let me know if you are running into any
other issues.

Best,
Jiangli

> /Magnus
>
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