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In my mind, Akka is the reason to use Scala right now. Why? Akka works fine with Java, Kotlin, and most other JVM languages.

• yareally 13y ago
  It's nowhere as elegant when used in Java though.
• saryant 13y ago
  I've used Akka with Java. It certainly works but it's a bit of a pain just because Java is so verbose. Some features like the FSM helper aren't available in Java either.