What is "jetty"

Jetty is a 100% HTTP and Servlet Container server written in Java. It is the major competitor of Tomcat that became famous for having been used as the Jboss Servlet container in the old days. Jetty’s big advantage over Tomcat is its easy setup. He was also the pioneer of using asynchronous I/O to withstand a higher load of simultaneous users without relying on the old thread-per-Connection strategy.

Source: Jetty - Wikipedia