Undertow - High performance non-blocking Webserver

Undertow is a flexible performant web server written in java, providing both blocking and non-blocking API’s based on NIO. Undertow has a composition based architecture that allows you to build a web server by combining small single purpose handlers. The gives you the flexibility to choose between a full Java EE servlet 3.1 container, or a low level non-blocking handler, to anything in between.