服务器端WebSockets的最佳Java框架

I want to create simple server having low load. The goal is to give a few javascript clients access to some functionality implemented in Java through WebSockets. I seek for best library to use for that - it should be simple, robust etc. Now I consider 3 alternatives - jWebSocket - jetty - netty What is the best? Or may be something else?I want to create simple server having low load.