There is a online demo for this application.
Make sure you are using jruby 1.7+ (jubilee 1.1.0+ require jruby 1.7.5 or later) and your JDK version is 7+
To run the application:
bundle && jubilee --eventbus /eventbus
Then go to http://localhost:8080 in your browser, if you have the page opened in multiple tabs or windows you can see the message you sent are broadcasted to all the other tabs.