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Yeah, you are right that decoupling build tool JDK and compile JDK is the way to go.

But Groovy does indeed not work, or has support very late for releases between 8, 11, 17 and 21 - so for anyone that wants to stay current (and not wait 3 or 2 years), using groovy in your code will be a pain - that might be also possible for other JVM languages, but I don't know, haven't used them.

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Oh interesting. Typically the gradle release notes, like 8.4-rc-1, will have comments that imply that Groovy build scripts compile but Kotlin ones lag.

"Gradle now supports using Java 21 for compiling, testing, and starting other Java programs. This can be accomplished using toolchains. Currently, you cannot run Gradle on Java 21 because Kotlin lacks support for JDK 21. However, support for running Gradle with Java 21 is expected in future versions."

https://docs.gradle.org/8.4-rc-1/release-notes.html#support-...

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