[FIXED] Unable to Run Kotlin Application in Eclipse

Issue

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?

---

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.

Solution

Tried with Java 8 (1.8.0_144) and Eclipse Oxygen.1a Release (4.7.1a - build id 20171005-1200) with the following plugin versions:

  Kotlin    0.8.2.v20170314-0957    org.jetbrains.kotlin.feature.feature.group  JetBrains
    kotlin-eclipse-policy   0.8.2.v20170314-0957    org.jetbrains.kotlin.policy.feature.group   JetBrains
    kotlin-weaving-feature  0.8.2.v20170314-0957    org.jetbrains.kotlin.weaving.feature.feature.group  JetBrains

Everything worked as expected, without the need to create a separate workspace and/or use Kotlin File instead of Kotlin Class:

Answered By - marcelovca90
Answer Checked By - Senaida (JavaFixing Volunteer)