Enable Java 25 support by alecharp · Pull Request #11148 · jenkinsci/jenkins

alecharp · 2025-10-03T13:48:24Z

JENKINS-76170 Support Java 25 in Jenkins.

Allow Jenkins to run with Java 25 without requiring the enable-future-java flag.

Testing done

mvn package -Pquick-build and using war/target/jenkins.war with Java 25 to start an instance.

Proposed changelog entries

Support Java 25.

Proposed changelog category

/label major-rfe

Proposed upgrade guidelines

N/A

Submitter checklist

The Jira issue, if it exists, is well-described.
The changelog entries and upgrade guidelines are appropriate for the audience affected by the change (users or developers, depending on the change) and are in the imperative mood (see examples). Fill in the Proposed upgrade guidelines section only if there are breaking changes or changes that may require extra steps from users during upgrade.
There is automated testing or an explanation as to why this change has no tests.
New public classes, fields, and methods are annotated with @Restricted or have @since TODO Javadocs, as appropriate.
New deprecations are annotated with @Deprecated(since = "TODO") or @Deprecated(forRemoval = true, since = "TODO"), if applicable.
New or substantially changed JavaScript is not defined inline and does not call eval to ease future introduction of Content Security Policy (CSP) directives (see documentation).
For dependency updates, there are links to external changelogs and, if possible, full differentials.
For new APIs and extension points, there is a link to at least one consumer.

Desired reviewers

@mention

Before the changes are marked as ready-for-merge:

Maintainer checklist

There are at least two (2) approvals for the pull request and no outstanding requests for change.
Conversations in the pull request are over, or it is explicit that a reviewer is not blocking the change.
Changelog entries in the pull request title and/or Proposed changelog entries are accurate, human-readable, and in the imperative mood.
Proper changelog labels are set so that the changelog can be generated automatically.
If the change needs additional upgrade steps from users, the upgrade-guide-needed label is set and there is a Proposed upgrade guidelines section in the pull request title (see example).
If it would make sense to backport the change to LTS, a Jira issue must exist, be a Bug or Improvement, and be labeled as lts-candidate to be considered (see query).

The Javadoc comment said: > When executing the resulting Callable, it executes > FileCallable#act(FileCallable) on this FilePath. The FileCallable interface does not have an `act(FileCallable)` method. That absence causes the Javadoc generation to fail on Java 25. There is a `FilePath.act(FileCallable)` method that could be inserted instead, but I'm not confident the comment would then be correct. Testing done: Confirmed that Javadoc generation fails on Java 25 without this change. Confirmed that Javadoc generation passes on Java 25 with this change. (cherry picked from commit 3fdf9c1)

github-actions · 2025-10-04T20:13:33Z

Please take a moment and address the merge conflicts of your pull request. Thanks!

Jenkinsfile

pom.xml

github-actions · 2025-10-09T16:22:30Z

Please take a moment and address the merge conflicts of your pull request. Thanks!

timja · 2025-10-10T21:42:35Z

Jenkinsfile

        axes.values().combinations {
          def (platform, jdk) = it
-          if (platform == 'windows' && jdk != 17) {
+          if (platform == 'windows' && jdk != axes.jdks.last()) {


reduces the manual effort to maintain this and decide which one to put

timja · 2025-10-11T21:32:41Z

Tested via replay, it worked:
https://ci.jenkins.io/job/Core/job/jenkins/job/PR-11148/16/pipeline-overview/?selected-node=434

[2025-10-11T10:12:47.877Z] Apache Maven 3.9.11 (3e54c93a704957b63ee3494413a2b544fd3d825b)
[2025-10-11T10:12:47.878Z] Maven home: Z:\agent\tools\hudson.tasks.Maven_MavenInstallation\mvn
[2025-10-11T10:12:47.878Z] Java version: 25-beta, vendor: Eclipse Adoptium, runtime: C:\tools\jdk-25
[2025-10-11T10:12:47.878Z] Default locale: en_US, platform encoding: UTF-8
[2025-10-11T10:12:47.879Z] OS name: "windows server 2019", version: "10.0", arch: "amd64", family: "windows"
[2025-10-11T10:12:49.636Z] WARNING: A terminally deprecated method in sun.misc.Unsafe has been called

Java version is out of date on ci.jenkins.io: jenkins-infra/helpdesk#4831

timja · 2025-10-11T21:32:49Z

/label ready-for-merge

This PR is now ready for merge, after ~24 hours, we will merge it if there's no negative feedback.

Thanks!

timja · 2025-10-11T22:12:25Z

Removing ready for merge as we likely need to revert the Jetty upgrade which I believe is needed for this?

see #11197

MarkEWaite · 2025-10-12T01:29:12Z

Removing ready for merge as we likely need to revert the Jetty upgrade which I believe is needed for this?

see #11197

Jetty can be downgraded in this pull request to 12.1.1 and Winstone to 8.14. Unfortunately, I can't tell if Jetty 12.1.1 has the issue or not.

timja · 2025-10-12T06:45:29Z

It does, any version after the one we were previously on has the issue

timja

Requires the upcoming Jetty 12.1.3 from what I understand

github-actions · 2025-10-12T08:47:56Z

Please take a moment and address the merge conflicts of your pull request. Thanks!

timja · 2025-10-21T17:29:10Z

/label ready-for-merge

This PR is now ready for merge, after ~24 hours, we will merge it if there's no negative feedback.

Thanks!

Beginning in March 2029, users will be warned that Java 25 will be reaching its end of support in the Jenkins project. Amends pull request: * jenkinsci#11148 The 2+2+2 Java support plan recommends that we drop support for a Java line after two years so that we're only supporting two Java versions at a time. Refer to the blog post: * https://www.jenkins.io/blog/2023/11/06/introducing-2-2-2-java-support-plan/ Also refer to the Jenkins Enhancement Proposal pull request (incomplete): * jenkinsci/jep#400 Testing done: * None. Relying on the existing behavior that I've seen from the Java 17 administrative monitor. It is now shown to users to warn them that we plan to drop Java 17 support by the end of March 2026

…5925) Warn users of Java 25 end of support September 2029 Beginning in March 2029, users will be warned that Java 25 will be reaching its end of support in the Jenkins project. Amends pull request: * #11148 The 2+2+2 Java support plan recommends that we drop support for a Java line after two years so that we're only supporting two Java versions at a time. Refer to the blog post: * https://www.jenkins.io/blog/2023/11/06/introducing-2-2-2-java-support-plan/ Also refer to the Jenkins Enhancement Proposal pull request (incomplete): * jenkinsci/jep#400 Testing done: * None. Relying on the existing behavior that I've seen from the Java 17 administrative monitor. It is now shown to users to warn them that we plan to drop Java 17 support by the end of March 2026

alecharp added 3 commits October 3, 2025 15:21

Bump winstone to get Jetty 12.1.1

a1c21cf

Accept to start Jenkins with Java 25

c02f85b

Build with Java 25

4ffa3fb

comment-ops-bot bot added the major-rfe For changelog: Major enhancement. Will be highlighted on the top label Oct 3, 2025

gounthar and others added 3 commits October 3, 2025 16:21

Merge branch 'master' into chore/java-25-support

efbbd07

Temporary fix for javadoc build

faa3fc8

MarkEWaite mentioned this pull request Oct 4, 2025

Revert "Update dependency org.jenkins-ci.main:jenkins-test-harness to v2505" #11125

Closed

github-actions bot added the unresolved-merge-conflict There is a merge conflict with the target branch. label Oct 4, 2025

lemeurherve mentioned this pull request Oct 5, 2025

Create 2.528.1 changelog and upgrade guide jenkins-infra/jenkins.io#8458

Merged

alecharp added 2 commits October 6, 2025 10:34

Bump winstone to 8.14

894fd75

Merge branch 'master' into chore/java-25-support

03edd33

github-actions bot removed the unresolved-merge-conflict There is a merge conflict with the target branch. label Oct 6, 2025

jglick approved these changes Oct 6, 2025

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jonesbusy approved these changes Oct 7, 2025

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Merge branch 'master' into chore/java-25-support

555861c

alecharp marked this pull request as ready for review October 9, 2025 07:08

alecharp changed the title ~~🚧 Testing Java 25 support~~ Enabling Java 25 support Oct 9, 2025

timja reviewed Oct 9, 2025

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timja reviewed Oct 9, 2025

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github-actions bot added the unresolved-merge-conflict There is a merge conflict with the target branch. label Oct 9, 2025

Merge branch 'master' into chore/java-25-support

5a1690b

github-actions bot removed the unresolved-merge-conflict There is a merge conflict with the target branch. label Oct 10, 2025

Update Jenkinsfile

6f43077

timja reviewed Oct 10, 2025

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comment-ops-bot bot added the ready-for-merge The PR is ready to go, and it will be merged soon if there is no negative feedback label Oct 11, 2025

timja removed the ready-for-merge The PR is ready to go, and it will be merged soon if there is no negative feedback label Oct 11, 2025

timja requested changes Oct 12, 2025

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github-actions bot added the unresolved-merge-conflict There is a merge conflict with the target branch. label Oct 12, 2025

alecharp force-pushed the chore/java-25-support branch from 9cab06d to 6f43077 Compare October 12, 2025 08:48

github-actions bot removed the unresolved-merge-conflict There is a merge conflict with the target branch. label Oct 12, 2025

timja approved these changes Oct 21, 2025

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comment-ops-bot bot added the ready-for-merge The PR is ready to go, and it will be merged soon if there is no negative feedback label Oct 21, 2025

Merge branch 'master' into chore/java-25-support

7cf0c9f

MarkEWaite changed the title ~~Enabling Java 25 support~~ Enable Java 25 support Oct 24, 2025

MarkEWaite merged commit 7e6c574 into jenkinsci:master Oct 24, 2025
17 checks passed

alecharp deleted the chore/java-25-support branch December 1, 2025 14:06

MarkEWaite mentioned this pull request Dec 12, 2025

Warn users in March 2029 of Java 25 end of support September 2029 #25925

Merged

8 tasks

MarkEWaite linked an issue Dec 15, 2025 that may be closed by this pull request

[JENKINS-76170] Add Java 25 to supported JVM version for Jenkins #16823

Closed

lemeurherve mentioned this pull request Dec 28, 2025

chore: update default JENKINS_VERSION to 2.534 jenkinsci/docker#2163

Merged

6 tasks

lemeurherve mentioned this pull request Jan 8, 2026

LTS 2.541.1 release jenkins-infra/helpdesk#4945

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JENKINS-76170 Support Java 25 in Jenkins.

Testing done

Proposed changelog entries

Proposed changelog category

Proposed upgrade guidelines

Submitter checklist

Desired reviewers

Maintainer checklist

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timja Oct 10, 2025

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alecharp commented Oct 3, 2025 •

edited by MarkEWaite

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