How to set up Kotlin's byte code version in Gradle project to Java 8?

Question

In Kotlin project, what is a proper Gradle script to make sure my classes will be compiled to byte code ver 52 (Java 8)?

For some reason my classes are compiled as v

Answer 1

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

// JVM target applied to all Kotlin tasks across all subprojects

// Kotlin DSL
tasks.withType {
    kotlinOptions.jvmTarget = JavaVersion.VERSION_1_8.toString()
}

//Groovy
tasks.withType(KotlinCompile) {
    kotlinOptions.jvmTarget = JavaVersion.VERSION_1_8
}