[pjmlp]

Java in VSCode is either Eclipse or Netbeans running headless, better use the real deal.

Of course that is no Kotlin outside InteliJ, JetBrains even has a blog post on how Kotlin is supposed to help selling more licenses.

https://blog.jetbrains.com/kotlin/2011/08/why-jetbrains-need...

By the way, for a little while there were some JetBrains employees doing an Eclipse plugin, but naturally they ramped out that effort.

https://blog.jetbrains.com/kotlin/2015/09/kotlin-eclipse-plu...