Building a self-executable JAR with Gradle and Kotlin

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Add the plugin application, then set the mainClassName as

mainClassName="[your_namespace].[your_arctifact]Kt"

For instance, suppose you have placed the following code in a file named main.kt:

package net.mydomain.kotlinlearn

import kotlin
import java.util.ArrayList

fun main(args: Array<String>) {

    println("Hello!")

}

your build.gradle should be:

apply plugin: 'kotlin'
apply plugin: 'application'

mainClassName = "net.mydomain.kotlinlearn.MainKt"

In fact Kotlin is building a class to encapsulate your main function named with the same name of your file – with Title Case.

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