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.:
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: