Jetty is a project mainly written in Java, it's free.
Micro applications with embedded Jetty plus other technologies
A set of micro applications using embedded Jetty and assorted web technologies.
The purpose is to provide a template application with embedded Jetty working properly.
Based on http://info.rmatics.org/2009/10/17/jsf2_tutorial_0/
For testing one must only run mvn jetty:run, war:inplace is NOT required to this setup to work.