Your thoughts on a microframework for Java?

Hi Guys: I'm building a dead simple and minimal microframework in Java that allows users to create a web application or a microservice using Java in minutes. (Focus on being able to write a microservice really fast). I would like to hear your opinions on what features, etc. you'd like to see or even your criticisms (e.g. we don't use java for that or it already exist). I'm looking for feedback on what kind of HttpServer to use... I would like to support plug-in-play with default being NanoHttpd.... Secondly, which template library would you suggest (e.g. Apache Velocity)? Thanks.