Deploying a Rails application in Tomcat with JRuby: A concise tutorial

I recently tried to deploy a Rails app in a Tomcat container, thinking it would only take a few minutes. Instead it took a few hours. After completing this tutorial, you will be able to bundle your Rails apps as .war files that can be easily dropped into most Java containers and rapidly deployed. There are tons of resources out there as to how to do this, but I haven’t found one place that explains the process plain and simply.
(Link: Deploying a Rails application in Tomcat with JRuby: A concise tutorial)