Rapidoid

Rapidoid is an HTTP server and modern Java web framework and application container that focuses on three things: speed, productivity, and performance. Some might say that Rapidoid is a collection of modules and there’s some truth to it, as this framework includes a network protocol framework, a REST API framework, a web GUI components module, and a template engine module, among others. 

Rapidoid is an extremely fast HTTP server and modern Java web framework / application container, with a strong focus on high productivity and high performance.