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Jenkins 2.479.1 is the first LTS version to require Java 17 or newer. Use 2.479.3 instead of 2.479.1 based on the recommendation in https://www.jenkins.io/doc/developer/plugin-development/choosing-jenkins-baseline/ https://www.jenkins.io/doc/developer/plugin-development/choosing-jenkins-baseline/ notes that 2.479.1 is the oldest LTS version currently supported by the Jenkins update center. It recommends 2.504.3 and 2.516.3 as good core dependencies. I didn't update to those versions on the assumption that testing with Java 25 was more likely to be accepted if fewer changes were made.
Plugin parent pom 5.28 is new enough to support Java 25 but not so new that it makes the change from JUnit 4 to JUnit Jupiter. Needed to compile and test with Java 25
Java 25 released September 16, 2025. Jenkins core has supported Java 25 since Jenkins 2.534, Oct 28, 2025. Compile and test on ci.jenkins.io with Java 25 and Java 21. Intentionally continues to generate Java 17 byte code as configured by the plugin parent pom. Does not compile or test with Java 17 any longer because we have found no issues in the past that were specific to the Java 17 compiler. The plan is to drop support for Java 17 in the not too distant future so that the Jenkins project is only supporting two major Java versions at a time, Java 21 and Java 25. Testing done: * Confirmed that automated tests pass with Java 25
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Test with Java 25
Java 25 released September 16, 2025. Jenkins core has supported Java 25 since Jenkins 2.534, Oct 28, 2025.
Compile and test on ci.jenkins.io with Java 25 and Java 21.
Intentionally continues to generate Java 17 byte code as configured by the plugin parent pom.
Does not compile or test with Java 17 any longer because we have found no issues in the past that were specific to the Java 17 compiler. The plan is to drop support for Java 17 in the not too distant future so that the Jenkins project is only supporting two major Java versions at a time, Java 21 and Java 25.
Also performs updates to allow compilation with Java 25, including:
Testing done
Submitter checklist