Kotlin Programming Cookbook

How to do it...

Let's go through these steps, with which we can create a self-executable JAR:

1. We’ll create a simple class HelloWorld.kt having the main function, which just prints out “Hello world!”:

fun main(args:Array<String>){   println("Hello world")}

2. Now we need to configure a jar task, which Gradle build goes through to inform it of our entry to our project. In a Java project, this will be the path to the class where our main() function resides, so you will need to add this jar task in build.gradle:

jar {   manifest {       attributes 'Main-Class': 'HelloWorldKt'   }   from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }}

3. After adding the preceding snippet to build.gradle, you need to run the following gradle command ...