Java to Kotlin: A Refactoring Guidebook

Gradle Build Rules

Adding Kotlin to a project is now even simpler than shown in the book because the Kotlin plugin adds the dependency on the Kotlin stdlib automatically. You don’t have to add it explicitly.

So the example on page 18 can be simplified to:

plugins {
    id 'org.jetbrains.kotlin.jvm' version "1.5.31"

... no change to project settings or dependencies ...

tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile) {
    kotlinOptions {
        jvmTarget = "11"
        javaParameters = true
        freeCompilerArgs = ["-Xjvm-default=all"]

Thanks to Piotr Krzemiński for pointing this out.