[mschulze]

The Spark Framework [0] is pretty easy to pick up IMO.

Spring (with Spring Boot) has approachable tutorials [1] on how to get started but will get intimidating pretty fast.

I highly recommend using Kotlin instead of Java when trying out the JVM, though.

[0] http://sparkjava.com/ [1] https://spring.io/guides/gs/rest-service/

[jventura]

I also recommend Java Spark for a minimalist framework. I would say that is quite similar to Flask in Python. But unlike Flask, Spark does not have a templating language. FOr something simple, I would recommend freemarker..