Allow building with latest JDK without extra setup

[LiamM32]

Description

Building the latest version with JDK 20 will fail. The README.md admits that this may happen on newer JDK versions. This should be fixed, so that one doesn't need to install an older JDK version just to compile NetBeans.

Use case/motivation

For ant build to run without errors when using JDK 20.

Related issues

No response

Are you willing to submit a pull request?

No

[neilcsmith-net]

The README also includes an explanation for this, and instructions for how to build with JDK 20. If you look at the GitHub actions workflows you'll also see how build is being tested on JDK 21 already.

I'm inclined to close this issue, but maybe someone has a thought on an alternative approach?

[mbien]

in all honestly. If we don't get any advantage out of having the one (?) module built using gradle, we should revert it again to ant.

The migration away from ant seems far away still if that ever happens (is it worth the trouble?). It could also end up being maven and not gradle - not sure if that was decided already. Maven is apache where we have dev connections to and pretty much industry standard outside of android still.

Ultimately a project like NB benefits of being buildable and ideally also testable on EA builds to get early warnings.

more users with the same problem: #6612, #5836

[neilcsmith-net]

@mbien "Gradle is just Ant with slightly better syntax" ^TM 😆

All (half) joking aside, I was under the impression there was a reason this had to be Gradle-based. If there isn't, then yes, let's get it changed back - Gradle approach to compatibility with newer JDKs is a PITA!