Unable to Run Kotlin Application in Eclipse

Question

In order to create my first, simple Kotlin project in Eclipse, I followed the steps in Getting Started with Eclipse Luna tutorial from Kotlin official website, i.e.:

• Install Kotlin Plugin for Eclipse from Eclipse Marketplace
• Open the Kotlin perspective and created a Kotlin Project
• Created the file "hello.kt" inside the "src" folder with the main method
• Right-clicked the file > Run As > Kotlin Application

However, I keep get the following error in Eclipse console:

Error: Could not find or load main class HelloKt

I have double-checked the Run Configuration for my project, and it does set the "Main class" as HelloKt (which I'm 100% sure it does not exist). Also, when I hit the "Search" button, the only item that Eclipse finds is HelloKt - (default package) (which, again, does not exist).

For the sake of completeness, find below the code for hello.kt file:

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

I noticed the following divergences between the tutorial and what I did:

• I'm using a different Eclipse version (the tutorial suggests Luna; I'm using Mars.2).
• I'm using a different JDK version (the tutorial DOES not suggest any specific version, but from the images, we can see they have used jdk1.6.0_45, while I'm using jdk1.7.0_79.

Note that I'm using the latest version of Kotlin Eclipse Plugin, so this is not the same case as in this post. These are the versions in my current installation:

• Kotlin 0.7.2.v20160930-0748
  • kotlin-eclipse-policy 0.7.2.v20160928-1525
  • kotlin-weaving-feature 0.7.2.v20160928-1525

Can any of these divergences be the cause of the error while running the application?

Do you see/know any potential cause or known bug regarding this scenario?

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UPDATE (May 14th, 2017)

Tried with Eclipse Neon.3 (eclipse.buildId=4.6.3.M20170301-0400), JDK 1.8.0_111, Kotlin 0.8.2.v20170314-0957 (kotlin-eclipse-policy 0.8.2.v20170314-0957, kotlin-weaving-feature 0.8.2.v20170314-0957, Equinox Weaving SDK 1.2.0.201701131634). The problem persists.

Answer 1

Try new Kotlin File instead of Kotlin Class:

Answer 2

For me it happened only once. I think this is some glitch from the Kotlin plugin, when you first create a Kotlin file and try run it. Try "new Kotlin class" paste the same content and see if it works. After that you should be able to run both files as it happened to me.