Write build.gradle and settings.gradle in Kotlin

Table of Contents

I summarized the way to write build.gradle and settings.gradle in Kotlin.

Environment

Kotlin 1.2.0
Gradle 4.4 RC 5

Required

Gradle 3.0 M1 or higher is required for writing build.gradle in Kotlin, Gradle 4.4 RC1 or higher is required for writing settings.gradle.kts in Kotlin.

build.gradle

Here is a sample in Kotlin.

import org.gradle.api.*
import org.gradle.kotlin.dsl.*
import org.gradle.plugin.*
import org.gradle.script.lang.kotlin.*
import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
group = "com.improve_future"
version = "1.0-SNAPSHOT"
buildscript {
val kotlinVersion = "1.2.0"
extra["kotlin_version"] = kotlinVersion
repositories {
mavenCentral()
}
dependencies {
classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion")
}
}
apply {
plugin("kotlin")
}
repositories {
mavenCentral()
jcenter()
}
dependencies {
val kotlinVersion = extra["kotlin_version"] as String
compile("org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlinVersion")
}
tasks.withType<KotlinCompile>(KotlinCompile::class.java).all {
kotlinOptions {
jvmTarget = "1.8"
}
}

import org.gradle.api.*

import org.gradle.kotlin.dsl.*

import org.gradle.plugin.*

import org.gradle.script.lang.kotlin.*

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

group = "com.improve_future"

version = "1.0-SNAPSHOT"

buildscript {

val kotlinVersion = "1.2.0"

extra["kotlin_version"] = kotlinVersion

repositories {

mavenCentral()

}

dependencies {

classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion")

}

apply {

plugin("kotlin")

}

repositories {

mavenCentral()

jcenter()

}

dependencies {

val kotlinVersion = extra["kotlin_version"] as String

compile("org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlinVersion")

}

tasks.withType<KotlinCompile>(KotlinCompile::class.java).all {

kotlinOptions {

jvmTarget = "1.8"

}

From Gradle 4.0 RC1, it is not needed because Kotlin DSL 0.9.0 is included, but when you use earlier Gradle, you have to write the following line into settings.gradle.

rootProject.buildFileName = 'build.gradle.kts'

1	rootProject.buildFileName = 'build.gradle.kts'

filter example is in Spring Boot のアプリケーションを AWS EC2 にデプロイする手順.

settings.gradle

This is not so different from one in Groovy.

(rootProject as ProjectDescriptor).name = "backlog_board"

1	(rootProject as ProjectDescriptor).name = "backlog_board"

Intellij IDEA consider rootProject as the interface without getName method, so I cast it to ProjectDescriptor. It can be also built successfully without cast.