kotlin IntelliJ IDEA main function not returning anything

Question

I am trying to learn Kotlin. While working my way through Kotlin Bootcamp for Programmers by Google I have encountered an issue with functions.

A simple Hello World function that I have added in separate kotlin script when ran does not return anything.

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

ScreenShot

In addition I am getting warning: WARNING: Illegal reflective access by com.intellij.util.ReflectionUtil

I was able to find solution which requires adding following line to gradle.properties but it seems not to work. org.gradle.jvmargs=-Dkotlin.daemon.jvm.options=--illegal-access=permit

Project JDK is coretto-15, IntelliJ IDEA is up to date. I am also curious why kotlin files have .kts extension while everywhere I look it says it should be .kt

Answer 1

You need to create the Kotlin sources under the src/main/kotlin directory. But you have created in under the src directory, which is not the source root. See alsoKotlin and Java sources.