[blandflakes]

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.