A modern programming language that makes developers happier.

kotlinlang

We are currently writing a multi-module server project in a mixture of Java and Kotlin. Java up to a particular date from which all new classes started being implemented in Kotlin. Only one little discomfort with proxies, everything else works smoothly. Then we have a related project that is being done entirely in Kotlin (except for a few entity classes generated by NetBeans in Java; this is only because I’m too lazy to write those by hand in Kotlin). The projects are over 20k lines so far and everything seems fine.