With the exception of Ceylon (because it's basically dead), there's actually a really nice gradient on the JVM these days: Clojure is a nice, expressive, dynam

With the exception of Ceylon (because it's basically dead), there's actually a really nice gradient on the JVM these days: Clojure is a nice, expressive, dynamic language that is really great for messing with arbitrarily-shaped data. Java is a workhorse language that has been powering businesses small and large for decades. Kotlin is a modern spin on Java, and the degree to which they share functionality (with differing or identical semantics) over time will be interesting. And then Scala exists for all your meta-type-wankery needs. It seems natural that Kotlin/Java would be most popular over time, with Clojure and Scala hanging out with small amounts of market share.