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According to the official documentation, 

_*"SAM conversions only work for interfaces, not for abstract classes, even if those also have just a single abstract method."*_

But I just tried it with an _Abstract Class_ and it seems to work. 

Did I not understand the documentation properly or this is now possible in New Kotlin version? :thinking_face:

 <https://kotlinlang.org/docs/reference/java-interop.html#sam-conversions|https://kotlinlang.org/docs/reference/java-interop.html#sam-conversions>

Hmm.  Was your abstract class from Java or Kotlin? I think they meant that SAM conversions only work for kotlin interfaces (marked fun interface), but I think any single method class in Java can be used with SAM conversions.

It was in Kotlin, I tried it in the Kotlin Playground.

I could have sworn that it worked the first time but maybe I probably got things mixed up. 

Because I just re-wrote it and it doesn't seem to work :neutral_face::slightly_frowning_face:

<https://pl.kotl.in/ESom5wOfd|https://pl.kotl.in/ESom5wOfd>