Introduction to Vert.x A gentle guide to asynchronous programming with Eclipse Vert.x for Java developers Vert.x – From zero to (micro)-hero Vert.x Core Manual
This is a collection of useful resources for building RESTful HTTP+JSON APIs. There are a lot of good tools and entire ecosystems out there! It can be overwhelming not knowing what options are available, so you can use this as a reference starting point.