How to set compileJava’ task ( 11) and ‘compileKotlin’ task (1.8) jvm target compatibility to the same Java version in build.gradle.kts?

You can set java version for java with

java {
    sourceCompatibility = JavaVersion.VERSION_11
    targetCompatibility = JavaVersion.VERSION_11
}

or alternatively:

java {
    toolchain.languageVersion.set(JavaLanguageVersion.of(11))
}

and for kotlin with:

tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
    kotlinOptions {
        jvmTarget = "11"
    }
}

All samples are in gradle kotlin dsl.

@Marian’s answer didn’t quite help me.

I end up setting the following in the app build.gradle

Android {
...
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_11
        targetCompatibility JavaVersion.VERSION_11
    }

    kotlinOptions {
        jvmTarget=11
    }
...
}