Ola Bini Tutorials
The JRuby Tutorial Part 1 - Getting started
A quick walkthrough of JRuby and how you can get started using it immediately.
The JRuby Tutorial Part 1.5 - Using JIRB to Check Java Behaviour
Demonstrates how to use the Interactive Ruby shell (IRB) in with JRuby, calling Java code alongside Ruby code.
The JRuby Tutorial Part 2 - Going Camping
Camping is arguably the simplest way to build web applications, and it runs great in JRuby. Ola walks you through setting it up.