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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.