[oe] [PATCH 0/2] RFC: Support building Java recipes with openjdk-8-native

[Kyle Russell]

It seems like a question of how many JDK versions meta-java plans on
providing, and for how long.  To me the number of different per-version
providers feels like a maintenance point that could quickly get out of
hand.  I guess my assumption has been that all of the embedded Java code
for the distribution would compile with the same JDK (either the latest JDK
provided by meta-java, or perhaps one behind the latest version; similar to
how oe-core handles gcc upgrades, for example), and that compile would pass
in the appropriate -target or -bootclasspath parameters for the preferred
JVM.

I hope I understand what you're saying, because I'd like to work together
toward a solution.

Does your distribution require specifying different providers per runtime
version?

On Wed, Feb 6, 2019 at 8:38 AM André Draszik <git at andred.net> wrote:

> Hi,
>
> First, I agree the current state isn't great at all.
>
> It does appear to me though that Java world seems to be a bit different, in
> that even today there are big Java projects out there that still only
> compile using Java 8, which others do compile fine using more recent
> versions.
>
> With your suggested approach it becomes impossible to properly support
> that,
> you still have to pick the lowest denominator globally.
>
> Other distributions, Debian based ones in particular are taking a different
> approach:
> Each Java compiler/runtime provides virtual properties, and recipes can
> depend on the required version easily, something like e.g.
> virtual/java8-sdk virtual/java9-sdk virtual/java10-sdk etc.
>
> I'had posted a patch series trying to mimic that before, but not really had
> time to work on that any more:
>
> http://lists.openembedded.org/pipermail/openembedded-devel/2018-July/195641.html
>
> http://lists.openembedded.org/pipermail/openembedded-devel/2018-July/195642.html
>
> http://lists.openembedded.org/pipermail/openembedded-devel/2018-July/195643.html
>
> http://lists.openembedded.org/pipermail/openembedded-devel/2018-July/195644.html
>
> http://lists.openembedded.org/pipermail/openembedded-devel/2018-July/195645.html
>
> http://lists.openembedded.org/pipermail/openembedded-devel/2018-July/195646.html
>
> http://lists.openembedded.org/pipermail/openembedded-devel/2018-July/195647.html
>
> What do you think?
>
> Cheers,
> Andre'
>
> On Tue, 2019-02-05 at 10:53 -0500, Kyle Russell wrote:
> > This series spun out of a request on the mailing list last October on
> > configuring meta-java for using openjdk-8-native to compile other Java
> > recipes that might require modern API features not provided by the
> > bootstrap VM classes.
> >
> >
> http://lists.openembedded.org/pipermail/openembedded-devel/2018-October/197186.html
> > [oe] meta-java configuration
> >
> > I've been running with this series on sumo, but I wanted to send it out
> > to get other thoughts on the approach.
> >
> > It seems like there's already precedent for this format with perlnative
> > and pythonnative.  That was more or less how I expected java-native to
> > behave initially until I understood more about the bootstrap process.
> >
> > If I've missed a valid use case of java-native and this change would
> > cause breakage to someone else's layer, I'd be fine with introducing
> > javanative.bbclass as a new class that provides the same functionality
> > as the following patch to java-native.bbclass.  (Its name would be more
> > closely aligned to perlnative and pythonnative without the dash.)
> > However, it appeared that java-native was essentially unused, and I
> > thought having both a java-native and javanative class would be
> > confusing.
> >
> > Kyle Russell (2):
> >   Add support for building Java recipes using java-native
> >   ant-native: only use classpath tools if no JDK
> >
> >  README                                          |  7 +++++++
> >  classes/java-native.bbclass                     | 17 ++++++++++-------
> >  .../ant-contrib/ant-contrib-native_1.0b3.bb     |  2 +-
> >  recipes-core/ant/ant-native_1.8.1.bb            |  4 ++--
> >  recipes-core/ant/files/ant                      |  9 +++++++++
> >  recipes-core/openjdk/openjdk-8-native.inc       |  2 ++
> >  6 files changed, 31 insertions(+), 10 deletions(-)
> >
> > --
> > 2.20.1
> >
>
>