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Groups > linux.debian.maint.java > #12447

OpenJDK for Bookworm and beyond

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Hi all,

OpenJDK 11 has been the default JDK in the last two releases, and a more 
recent version for Bookworm is highly expected. The current LTS version 
is OpenJDK 17, released in September 2021 one month after Bullseye. The 
next LTS version will be OpenJDK 21 (the LTS cadence has been shortened 
from 3 to 2 years) to be released in September 2023, again shortly after 
the Debian release which can be expected in July or August 2023 if the 
rhythm of the previous releases is kept. This scenario is likely to 
continue in the future since the Debian and Java releases are now 
synchronized on the same 2 years cycle.

The first point is to plan when we'll switch the default JDK to OpenJDK 
17. The transition has progressed well, with 113 bugs fixed already, but 
there are still 36 bugs left to fix [1] (this is a much smoother 
transition than the jump from OpenJDK 8 to 11 where we had to deal with 
over 500 bugs). There are no critical issues, the build tools and the 
main packages all work fine. So I suggest that we switch without waiting 
for the remaining bugs to be fixed. I propose to switch on October 31th 
for Halloween, such that the switch will unleash compatibility 
nightmares and runtime horrors haunting those who have ignored the bug 
reports for months ;) That'll leave sufficient time to address the 
remaining issues before the release.

Another point is how to deal with the next LTS, OpenJDK 21. For Bullseye 
the Security Team agreed to ship OpenJDK 17 as a "technology preview" in 
addition to OpenJDK 11, with no promise it would be as well supported as 
OpenJDK 11. In practice, thanks to Matthias and Moritz prompt uploads, 
the OpenJDK 17 updates landed in stable-security on average 8 days after 
the GA release, which is as good as the OpenJDK 11 updates. Popcon 
reports 4524 installs of OpenJDK 17 with a steady growth, and 51690 
installs of OpenJDK 11. Assuming OpenJDK 17 users also have OpenJDK 11 
installed that's about 8% of the Java users interested in the latest LTS 
JDK. This is a significant share of users and it shows the extra effort 
involved in maintaining an additional JDK is worth it.

If the Security Team agrees I think we should continue with this 
strategy in Bookworm and ship OpenJDK 21 in addition to OpenJDK 17. The 
first OpenJDK 21 EA release will be available in December well before 
the freeze in March, so that fits with the Bookworm release timeline.

Last point, we still have OpenJDK 8 in unstable to help with the 
bootstrapping of some packages that can't build directly with the latest 
JDK (more specifically, Kotlin and Scala). Similarly I think we should 
preserve OpenJDK 11 in unstable after the transition to OpenJDK 17.

Emmanuel Bourg

[1] 
https://bugs.debian.org/cgi-bin/pkgreport.cgi?tag=default-java17;users=debian-java@lists.debian.org

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OpenJDK for Bookworm and beyond Emmanuel Bourg <ebourg@apache.org> - 2022-09-29 12:10 +0200
  Re: OpenJDK for Bookworm and beyond Thorsten Glaser <t.glaser@tarent.de> - 2022-09-29 14:10 +0200
    Re: OpenJDK for Bookworm and beyond Emmanuel Bourg <ebourg@apache.org> - 2022-09-29 20:10 +0200
      Re: OpenJDK for Bookworm and beyond Thorsten Glaser <t.glaser@tarent.de> - 2022-09-29 20:40 +0200
      Re: OpenJDK for Bookworm and beyond Phil Morrell <debian@emorrp1.name> - 2022-10-12 02:00 +0200
    Re: OpenJDK for Bookworm and beyond Moritz Mühlenhoff <jmm@inutil.org> - 2022-11-08 21:00 +0100
      Re: OpenJDK for Bookworm and beyond Thorsten Glaser <t.glaser@tarent.de> - 2022-11-08 21:00 +0100
      Re: OpenJDK for Bookworm and beyond David Goodenough <david.goodenough@linkchoose.co.uk> - 2022-11-09 12:50 +0100
  Re: OpenJDK for Bookworm and beyond Emmanuel Bourg <ebourg@apache.org> - 2022-10-31 19:50 +0100
    Re: OpenJDK for Bookworm and beyond Thorsten Glaser <t.glaser@tarent.de> - 2022-10-31 20:00 +0100
      Re: OpenJDK for Bookworm and beyond Emmanuel Bourg <ebourg@apache.org> - 2022-11-10 21:40 +0100
        Re: OpenJDK for Bookworm and beyond Thorsten Glaser <t.glaser@tarent.de> - 2022-11-10 22:20 +0100
          Re: OpenJDK for Bookworm and beyond Thorsten Glaser <t.glaser@tarent.de> - 2022-11-10 22:50 +0100
            Re: OpenJDK for Bookworm and beyond Emmanuel Bourg <ebourg@apache.org> - 2022-11-11 01:40 +0100
              Re: OpenJDK for Bookworm and beyond Thorsten Glaser <t.glaser@tarent.de> - 2022-11-11 01:50 +0100
                Re: OpenJDK for Bookworm and beyond Emmanuel Bourg <ebourg@apache.org> - 2022-11-11 12:00 +0100
                Re: OpenJDK for Bookworm and beyond Thorsten Glaser <t.glaser@tarent.de> - 2022-11-11 16:30 +0100
          Re: OpenJDK for Bookworm and beyond Emmanuel Bourg <ebourg@apache.org> - 2022-11-10 22:50 +0100
  Re: OpenJDK for Bookworm and beyond Moritz Mühlenhoff <jmm@inutil.org> - 2022-11-08 20:50 +0100
    Re: OpenJDK for Bookworm and beyond Emmanuel Bourg <ebourg@apache.org> - 2022-11-10 20:40 +0100

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