- Spring Boot: by far the most popular and has a large amount of nice integrations for most of the functionality that you might possibly want; also kind of complex and a pain to debug in non-trivial cases
  - Dropwizard: a combination of many popular libraries out there with a common core to make it a proper framework, takes a bit of getting used to but is also rather nice to use
  - JHipster: a pretty interesting take on the idea of generating lots of code from models, close to Rails scaffolding in that regard
  - Eclipse Vert.X, Helidon, Micronaut, Quarkus: a bunch of smaller frameworks/libraries that might be easier to wrap your head around and offer alternate paradigms or ways to do things; sometimes not quite "idiomatic Java" but also can be way more performant than the likes of Spring Boot