F33 system wide change, java-11-openjdk as system jdk

[Jiri Vanek]

Hello fellow java package maintainers!

We are planning to bump the JDK from java-1.8.0-openjdk to java-11-openjdk for F33. Please
see
https://fedoraproject.org/wiki/Changes/Java11

Short Story:
 * if you have some java package, be aware that we are bumping JDK in rawhide
 * Ensure your package builds and runs fine with JDK11 (see the
https://copr.fedorainfracloud.org/coprs/jvanek/java11/builds/)
 * there is special tooling ready for this, before mass rebuild is launched
 ** See https://fedoraproject.org/wiki/Changes/Java11#copr_preliminary_rebuild
 * If you do not want Fedora rotten with JDK8 for ever, continue reading

Long Story:
We ran a preliminary mass rebuild of javastack in copr repo
https://copr.fedorainfracloud.org/coprs/jvanek/java11/builds/ (select "all"
instead of "25" at the
bottom), on packages requiring java,javac, java-devel, maven-local, ant, ivy & comp
for build. You
can see, the result was quite dramatic:
1225  total; attempted to rebuild
483   failed; from those 191 are trivial failures (but if you fix it, there is no
guarantee real
troubles are not hidden behind that)
186   succeeded
556   orphans or dead or otherwise tragic so the build did not even start

I would kindly ask you to search yourself in this list:
https://jvanek.fedorapeople.org/java11/people
If you are here, please check status of your package in
https://jvanek.fedorapeople.org/java11/init
(pain text of https://copr.fedorainfracloud.org/coprs/jvanek/java11/builds).
 * If your package is "succeeded",  congratulations nothing to do, and just keep
en eye on JDK bump
 * If there is "failed" but contains "- 	-" then it is probably
orphan. If you wish to resurrect it,
please ensure it runs against JDK11 (see lower)
 * If there is "failed" but failed in "seconds", then those packages
failed so quickly, that the
build was in initial phases. That usually mean that you build with source/target lower
then 1.6
JDK11 supports 1.6 and up. We recommend to bump the source/target to 1.8, to allow
existence of
compact 1.8 packages alongside main javastack. See
https://fedoraproject.org/wiki/Changes/Java11#Wrong_source.2Ftarget_version. Don't
forget to
upstream the patch, or maybe it is enough to update to more fresh upstream release which
supports
JDK11? it may happen, that after the fix, your build will fail in more terrible way (see
below)
 * If there is "failed", and its none of above, then your package simply failed.
Very often the
scary error may be fixed by bump to latest upstream version. JDK 11 is out for several
years.
Please, try to fix the package. Don't hesitate to ask on devel(a)fedoraproject.org or
java-devel(a)fedoraproject.org or directly to me jvanek(a)redhat.com. If you fix the fail,
feel free to
share your fix, it may help others.
We are trying to gather the most common issues at
https://fedoraproject.org/wiki/Changes/Java11#common_issues_packagers_can...
.
 Feel free to enhance the page, or write us your case (possibly both with solution and
without) so
we can add it here.

Debugging Your failures.
The copr repo we maintain, contains builds of java-11-openjdk as system JDK,
javapackages-tools
honoring that, and java-1.8.0-openjdk as non system JDK. Also it contains successfully
rebuilt
packages. You can directly use this copr repo in several ways.
 * first glance on error. On https://copr.fedorainfracloud.org/coprs/jvanek/java11/builds/
find your
build  (select "all" instead of "25" at the bottom),
 ** Click its number, select chroot (currently  fedora-32-x86_64 ) and check the logs.
Main log is
build.log.gz.
 * anything you push to rawhide, will automatically rebuild here in f32 chroot (we have a
JDK in
rawhide broken a bit currently)
 ** It is the best approach. If you can fix your package in rawhide directly, without
breaking the
rawhide too much, go for it
 ** If yo need to experiment, I have a mock config for you (generated from  copr-cli
mock-config
jvanek/java11 fedora-32-x86_64) which you can copy to your /etc/mock and use -
https://jvanek.fedorapeople.org/java11/jvanek-java11-fedora-32-x86_64.cfg .  Eg:

 sudo cp downloaded-fedora-32-x86_64.cfg /etc/mock/jvanek-java11-fedora-32-x86_64.cfg
 # change spec, bump sources, apply patches
 fedpkg srpm
 mock -r jvanek-java11-fedora-32-x86_64  *.src.rpm

Or any other packaging workflow you use, and you can use against the copr repo.
Thank you very much for your help, there are 500 failures, and 1000 java packagers, but
only 2
active members of java sig. Without your help, the JDK bump will be very hard.

Thank You!


On behalf of Fedora java group
  J.
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