This demo app demonstrates how to create a simple non-blocking WebSocket and HTTP server using Nashorn scripting and Webbit (hello end-to-end, Javascript apps on the JVM!)

http://tech.kinja.com/a-simple-realtime-webapp-using-nashorn-scripting-1059181159

• install java 8
• maven
• make

make update

make run

then visit:

http://localhost:9000/index.html

and

http://localhost:9000/hello

make console

Combining all this with [fswatch] (https://github.com/alandipert/fswatch), one could get a pretty decent development environment for building server side JavaScript services on the JVM.