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Kotlin is positively awesome, but when I tried it (admittedly last year) it didn't seem ready for production yet. It worked all well as long as stuff was kept simple, then I used Realm.io, wrote some unit tests and got all sorts of NoClassDefFoundError exceptions, dexmaker errors etc. Long story short, I couldn't fix it. As I said, it's been a while. I hope things have been improving and continue to improve. The language itself is superb

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It's pretty damn closed to 1.0. They just released M12 which adds support for interop with Java libs that use annotation processing such as Dagger.

With the just released support for annotation processing Kotlin is now working with e.g. Realm.

I've just been playing with it some in the last couple of weeks. I get the impression that they're still iterating pretty rapidly on it - at least partly because the official practice repo uses trait all over the place, which they apparently deprecated and changed to interface.

I will say that it It looks very promising so far, and seems to have the best of C# and Ruby, assuming you're sticking with compile-time type checking, plus a few more tricks besides. I'm not that up on JVM languages though, so I'm not sure that it's definitively better than any of the other choices.

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