Kotlin on Google App Engine

build.gradle

buildscript {
    ext.kotlin_version = '1.0.5'

    repositories {
        mavenCentral()
    }
    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'org.springframework.boot:spring-boot-gradle-plugin:1.4.2.RELEASE'
        classpath "com.google.cloud.tools:appengine-gradle-plugin:+"
    }
}

apply plugin: "kotlin"
apply plugin: 'com.google.cloud.tools.appengine'
apply plugin: 'org.springframework.boot'

repositories {
    mavenCentral()
}

sourceCompatibility = 1.8
targetCompatibility = 1.8

sourceSets {
    main.java.srcDirs += 'src/main/kotlin'
}

dependencies {
    compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
    compile 'com.google.appengine:appengine:+'
    compile("org.springframework.boot:spring-boot-starter-web")
}