If anyone's interested in Kotlin on the server side, I put up a GitHub repos with an EAR/EJB project. I'll be expanding this to include a TornadoFX client later this weekend. I have a standalone one working with TornadoFX talking to the remoted EJBs but am investigating making this an application client so that I can inject the EJBs.
https://github.com/bekwam/wf-kotlin-demo