This tutorial is based on it: http://code.google.com/p/appengine-jruby/wiki/GettingStarted Install "google-appengine" gem % sudo gem install google-appengine % sudo gem install appengine-apis % gem list | grep appe appengine-apis (0.0.14) appengine-jruby-jars (0.0.7.pre) appengine-rack (0.0.7) appengine-sdk (1.3.2) appengine-tools (0.0.11) google-appengine (0.0.11) Create hello project % appcfg.rb