Hi Maciej, Thanks for raising this issue. I wanted to share that I've gone through the jenkins.io documentation and believe I have created or updated all the documentation spots for Java 21. This includes Java 21 upgrade instructions <https://www.jenkins.io/doc/book/platform-information/upgrade-java-to-21/>, an update to the platform information page <https://www.jenkins.io/doc/book/platform-information/> to include Java 21, various installation documentation being updated to use images with Java 21 such as Linux <https://www.jenkins.io/doc/book/installing/linux/> and Docker <https://www.jenkins.io/doc/book/installing/docker/>, and any area that would have previously used Java 17. If there are any other areas of documentation that need to be updated accordingly, please let me know and I'd be happy to make sure that everything is current.
Thanks very much, Kevin Martens, Jenkins Documentation Officer On Thursday, April 10, 2025 at 6:34:22 AM UTC-4 maciej wrote: > Ullrich Hafner (2025-04-09 21:05): > > Yes, you are right. It makes sense to switch to Java 21 in the next couple > of months (actually I never understood why one should not directly move > from Java 11 to Java 21 for the controllers, as we also fully support Java > 21 from the beginning of the Java 17 switch). The plan is to switch the > weekly Jenkins releases to Java 21 in the middle of this year. > See > https://www.jenkins.io/blog/2023/11/06/introducing-2-2-2-java-support-plan/ > > If you find such wrong references of the Java version in out documentation > it would be helpful if you can either create an issue in Jira or even > better: click the „Improve the page“ button and fix the corresponding page > by yourself. This helps us a lot as the documentation is spread along a lot > of different files... > > > The link does explain a bit, thanks. It talks about dropping JDK11, though. > > As for the docs updates, I really don't know what problems come with the > upgrade, so I can't write about that. Should I expect everything to just > work? Will all plugins work? Is there a tester script for this? Are popular > plugins tested with various versions of Java automatically? > > I saw the video on upgrading to JDK17 (linked in the docs > <https://www.jenkins.io/doc/book/platform-information/upgrade-java-to-17/index.html>), > > and it just talks about how to check my Java version and how to make sure > the main node and builder nodes use the same Java version (which is helpful > but doesn't explain much). It does seem like a very manual process to > verify the upgrade. > > Cheers, > Maciej Nux > -- You received this message because you are subscribed to the Google Groups "Jenkins Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to jenkinsci-users+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/jenkinsci-users/3673925e-a48e-4e74-8d50-bfca2be11449n%40googlegroups.com.
