Working on a REST/JSON web service? No need to reinvent the wheel - there are several nice packages to get started. One that we've had tremendous success with is Dropwizard. Java-based, ops-friendly, very fast and easy to get started.
Another interesting package is Swagger. For larger projects, documentation and self-describing services become more and more important. One nice thing about Swagger: quick, fast bootstrap for everything - Spring, Play, Scala to Node.js, and many more.