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I think it means that a library written in Kotlin is difficult or impossible to use from Java.

• EddieRingle 9y ago
  Not really true from my experience. For example, here's a Markdown library written in Kotlin that you can use with a plain Java interface: https://github.com/valich/intellij-markdown https://github.com/valich/intellij-markdown
• edem 9y ago
  No no no no. Kotlin provides a lot of tools to make your library usable from Java and it works.
  • pdpi 9y ago
    You have to write your Kotlin anticipating it'll be called from Java though (e.g. by using SAM interfaces instead of function types for your arguments)
    • lmm 9y ago
      Is Kotlin's function not an SAM interface? I'm pretty sure Scala's is.
    • edem 9y ago
      This does not mean that it is a one-way interop. When you write it the right way, it will work from Java.