Kotlin + Dropwizard is a great choice (or Spring Boot). I've used it in production and it's got the best aspects of Rails (opinionated) with the best aspects of

Kotlin + Dropwizard is a great choice (or Spring Boot). I've used it in production and it's got the best aspects of Rails (opinionated) with the best aspects of a modern, statically typed language running on the JVM (need I say more?).