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Test with Java 21
Java 21 released Sep 19, 2023. We'd like to announce full support for Java 21 in early October and would like the most used plugins to be compiling and testing with Java 21.
The acceptance test harness and plugin bill of materials tests are already passing with Java 21. This is a further step to improve plugin readiness for use with Java 21 and for development with Java 21.
The change intentionally tests only two Java configurations, Java 17 and Java 21 because I believe that the risk of a regression that only affects Java 11 is very low. We generate Java 11 byte code with the Java 17 and the Java 21 builds, so we're already testing Java 11 byte code.
Includes pull request to update parent pom because that is required for Java 21 compile and test. The pull request is
Includes pull request to update plugin bill of materials and changelist maven extension because I didn't want to test without them.
Testing done
Confirmed tests pass with Java 21 on Linux.
Submitter checklist