Hi, I would like to use variants to produce two versions of the same software, one targeting Java 8+ and one targeting Java 11+. I am already using the toolchains to test with multiple versions of the JDK, but I must specify: java { toolchain { languageVersion.set(JavaLanguageVersion.o…

I’m not sure what you mean. If you configure the toolchain like you showed, the 11+ variant should already also use the Java 8 toolchain.

Sorry, my bad. I want the Java 11 variant to use the JVM v11. I edited the original post.

Ah, makes more sense then. :slight_smile: Iirc, you just set a different toolchain for the compile task of that variant.

You could define an additional JavaCompile - Gradle DSL Version 7.6 task using examples from Using toolchains Sample : tasks.register("compile11", type: JavaCompile) { javaCompiler = javaToolchains.compilerFor { languageVersion = JavaLanguageVersion.of(8) } } so you will have tasks…

This would be fine if I weren’t using variants. My understanding is that variants pre-generate compilation tasks; according to @Vampire (if I got it correctly), I only need to configure the compiler for these tasks.

Yes, you got me right. The manual shenenigans @gavenkoa suggests are not needed when using proper feature variants as the feature variants already register and wire all necessary tasks.

Is there an example of variant redefinition for JavaCompiler version? Modeling feature variants and optional dependencies (gradle.org) Could I use anything supported in java when I inside registerFeature closure?

Could I use anything supported in java when I inside registerFeature closure? No. Well, you can, but will probably configure the main things, not the feature variant as having things inside is just the same as having them outside. I strongly recommend using the Kotlin DSL, because then you have…

Hi @Vampire , Do you by any chance have a working example that you could share? The issue you linked seems stale and hasn’t been touched for almost 2 years? I’m struggling to find good examples of how to use variants and toolchains together to target different java versions, and the documentation …

@DanySK , maybe you also have some examples that you could share, if you’ve figured it out? Thanks.

Using variants and toolchains together

Help/Discuss

DanySK (Danilo Pianini) December 21, 2023, 1:49pm 13

No, sorry: I’ve tried a few times, and gave up in the end. It requires too much effort to get started without a template, and did not have enough time to investigate in depth.

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Using variants and toolchains together

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