Jruby Warble and Tomcat
I spent around a day to to get the three to work together(JRuby, Warble & Tomcat). The biggest problem I encountered was getting rails to work with JRuby. I found out the hard way that you need to install openssl gem before you install any other gem. One other key thing is if you plan on getting the database to work with ActiveRecord was in database.yml you need to use host: 127.0.0.1 instead of localhost.
You can use warble to build the war file and then drop this war file into tomcat and it works like a charm. Hope to get some more work done this weekend