Socrata-HTTP is a toolkit for HTTP client access and building rack-style servers. The server is Jetty-based, but not Servlet-based, though it does use HttpServletRequest and HttpServletResponse.
There is a minimal ExampleService.
There is a minimal sbt project using this as well.
There is an old example at TeaService, TeaRouter and TeaParty, but unfortunately only compiles with socrata-http 2.x.x.
- Zookeeper-based service discovery and registration
- Graceful termination of requests at exit