Lately there have been too many people wanting to know how to execute Javascript in Celerity. Let me show you how it done. First a quick note on JRuby installation. Here are few useful links to install JRuby under 1. Linux(ubuntu) should work for other linux packages as well. 2. Windows. Just to confirm,kindly type jruby -v on terminal or cmd depending on OS you are using and you should get the version of jruby you are running. Mine output …