Getting started Here’s how to get rolling: Download and install JRuby Grab a tarball, and just unpack and run! Install warbler jruby -S gem install warbler Use this sample application as a starting point You can get it from JRuby-Rack's repository on Github. Change the application id Edit appengine-web.xml and replace it in the <application> section. Deploy! jruby -S rake appengine:deploy \ EMAIL=