Building a Kotlin + Java 9 project with Gradle

Question

I\'m fairly new to Gradle (and Java 9, to be honest), and I\'m trying to use Gradle to build a simple library project that is a mix of Java 9 and Kotlin. More in detail, there i

Answer 1

The accepted answer did not work for me (atleast not the way it was presented), but this is what worked:

plugins {
    id "org.jetbrains.kotlin.jvm" version "1.3.50"
}

compileKotlin {
    doFirst {
        destinationDir = compileJava.destinationDir
    }
}

jar {
    duplicatesStrategy = DuplicatesStrategy.EXCLUDE
}

Doing it the way the accepted answer suggests led to me getting this error:

Directory '/path/to/project/build/classes/kotlin/main' specified for property 'compileKotlinOutputClasses' does not exist.

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Gradle version: 5.6