Most Rubyists know that JRuby is the implementation of our favorite little language that runs on the Java VM. JRuby is 99.99% compatible with the traditional MRI implementation and is rapidly closing in on complete 1.9 compliance. But what is it like to use JRuby in a real application? Drawing on several years of real-world experience with JRuby based solutions, Russ will discuss using JRuby in production applications. Why pick JRuby over one of the other Ruby implementations? What are the real world pitfalls of using JRuby and how do you avoid them? Russ will also look at how you can put JRuby to work in some unexpected ways and point out some things that you can do to ensure that it all keeps running. About Russ: Russ Olsen is the author of Design Patterns in Ruby as well as the upcoming book Eloquent Ruby. Less