Document how to execute it on Java 16

[lukas-krecan]

Can you please document how to execute the plugin on Java 16 with stricter module check. It's necessary to pass a JVM argument to open java.base module, but I could not find how to do it. See this SO question.

[Tapchicoma]

I think you have to use Gradle 7 as it only in this release have added JDK 16 support.

If it will not help, please let me know.

[lukas-krecan]

That's a pity. It seems that the rest of the ecosystem works with Gradle 6 and Java 16 (Kotlin compiler, Koltin DSL, ...). I would expect that somehow passing org.gradle.jvmargs to the Gradle plugin execution should help, but my knowledge of Gradle plugins is limited.

[Tapchicoma]

Interesting, I will see if it can be fixed from the plugin side :thinking:

/cc @JLLeitschuh

[JLLeitschuh]

Supposedly, support for Java 16 is only in Gradle 7. I'd advise that we add it to the matrix for CI and see what fails.

[ZacSweers]

Kotlin itself doesn't really support JDK 16 until Kotlin 1.5