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I like Jetty. Javalin is nice for Kotlin but Jetty + java has worked well for me.

What do you use for routing and DI? do you use Jetty handlers or the servlet API?

Dropwizard is cool if you write REST microservices. It uses embedded jetty, JAX-RS, Jackson, metrics, etc.

As far as I know it's inspiration for Spring Boot, and it's simpler and ready to use on production.