I’m seeing this warning emitted from KGP in a project that does appear to set the JVM target to 11, ...

# eap

[Zac Sweers]

I’m seeing this warning emitted from KGP in a project that does appear to set the JVM target to 11, wondering if this is a bug I should file or something I’m missing

> Task slack plugincompileTestKotlin

‘compileTestJava’ task (current target is 11) and ‘compileTestKotlin’ task (current target is 1.8) jvm target compatibility should be set to the same Java version.

By default will become an error since Gradle 8.0+! Read more: https://kotl.in/gradle/jvm/target-validation

Consider using JVM toolchain: https://kotl.in/gradle/jvm/toolchain

Repro: https://github.com/slackhq/slack-gradle-plugin/pull/166

CC @tapchicoma

[Zac Sweers]

It is configured to JvmTarget 11 here: https://github.com/slackhq/slack-gradle-plugin/blob/9d87202674d48ed26dfa1fdb2fa91f30edc4ad29/build.gradle.kts#L184

[Alexander.Likhachev]

That’s an effect of you applying the kotlin-dsl plugin. It reconfigures some properties in `afterEvaluate`: https://github.com/gradle/gradle/blob/daece9dbc5b79370cc8e4fd6fe4b2cd400e150a8/sub[…]n/org/gradle/kotlin/dsl/plugins/dsl/KotlinDslCompilerPlugins.kt

[Alexander.Likhachev]

It seems you can configure the value that the plugin is setting:

kotlinDslPluginOptions {
  jvmTarget.set(...)
}

but since Gradle 8.0 (at least I see such code in master of Gradle) it will be automatically picked up from a JVM toolchain

[tapchicoma]

@Alexander.Likhachev you've told about another issue - not related to posted here 🙂

[tapchicoma]

Let me check the repro

[tapchicoma]

ah no, @Alexander.Likhachev is right - it is issue with kotlin-dsl plugin setting in afterEvaluate jvmTarget to 1.8

[tapchicoma]

so KGP is fine

[tapchicoma]

also note that since KGP 1.8 this check is also running when Java sources is empty - so you see such warning

[Zac Sweers]

wait why would it be setting the jvmTarget of KotlinCompile lower? Shouldn’t kotlin-dsl just apply to the buildscript itself?

[tapchicoma]

check this link from Alexander - it applies it to every KotlinCompile task in project.

[Zac Sweers]

such a frustrating situation with gradle