MINOR: Run CI with Java 24 and update documentation (instead of 23)

[ijuma]

No description provided.

[ijuma]

Looks like Java 24 isn't available yet. Is that right @mumrah or is there something else we must do to make Java 24 available?

[m1a2st]

It seems that Gradle does not support Java 24 yet. https://docs.gradle.org/current/userguide/compatibility.html

[frankvicky]

It seems the gradle team is still working on it.
gradle/gradle#32576

[mumrah]

@ijuma yea it looks like setup-java could not find an image for temurin 24. I guess we'll need to wait for that as well as Gradle to ship support for 24. I expect it won't take very long.

[srdo]

I was looking at doing this too, and want to share a few changes in case it saves you work:

You likely need to upgrade to Scala 2.13.16 https://github.com/apache/kafka/compare/trunk...srdo:kafka:java-24-build?expand=1#diff-a74b4a65ab1f4aed61344787bb9654ba7e835154730653848c88ca11f9965dc0R250

You will also likely need to upgrade Spotbugs to the latest version https://github.com/apache/kafka/compare/trunk...srdo:kafka:java-24-build?expand=1#diff-49a96e7eea8a94af862798a45174e6ac43eb4f8b4bd40759b5da63ba31ec3ef7R42

Since Spotbugs has introduced new warning types, you may need to add some exclusions https://github.com/apache/kafka/compare/trunk...srdo:kafka:java-24-build?expand=1#diff-359c6969c92e0b25bb854c49e9d08391af4a17a7019450b123d473ba318ad3d4 until someone can investigate the potential bugs.

[ijuma]

@srdo Feel free to submit your own PR if you're further along - I can then close this one.

[srdo]

@ijuma I just have the bits I linked above, which is how far I got before getting roadblocked by Gradle. Feel free to use those bits if they're helpful for this PR. If not, that's fine too :)

[srdo]

Raised #19514, as you suggested. It includes the commit from this PR, and updates some dependencies to get the build working.

It's still blocked by Gradle not having released a Java 24-compatible version, and Spotbugs turns out to have an issue that requires them to release a new version as well. Once they release, I'll update that PR.

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