JRuby is regarded as the most stable and efficient implementation of Ruby. Running JRuby on top of Google App Engine for Java gives access to many interesting possibilities, including running Rails on top of Google’s infrastructure. Exactly how to make this happen is not totally apparent, though, and there are several gotchas involved in the process. This presentation will introduce the pieces of JRuby needed to get everything working, what kind of customizations are needed, what you might need to avoid in Ruby to avoid getting in trouble with App …

An interview with Stuart Halloway, author of “Programming Clojure” and the “Java.next” article series. He talks about how evaluating Groovy, JRuby, Scala, and Clojure eventually lead him to write a book on Clojure.

Chris Read will give us the potted history of how we arrived at Cloud Computing when so many similar initiatives failed to take off. He will also outline what makes GAE/J different from other Cloud technologies. While getting your first Java application working on GAE/J will probably only take you ten minutes Ola Bini will explain some of the differences you need to take into account between regular Java Web development and development on GAE/J. He will also look at how GAE/J and JRuby allows you combine the power of …

The Java platform is changing. No longer can a developer get by just knowing Java. There’s JRuby providing Ruby and Rails. There’s Groovy with Grails and other frameworks. Jython for Django. Scala with Lift. Rhino for JavaScript and frameworks like Phobos. And all of them provide not only access to their own frameworks and libraries, but first-class Java scripting capabilities. If you aren’t on a project that uses one of these languages today…you will be soon. This talk will explore JRuby as an example of how the Renaissance Developer on …

In this presentation from QCon London, Ola Bini shows how JRuby is implemented, how it’s optimized and what it can be and what it is used for.
http://www.infoq.com/presentations/bini-power-on-jvm

In this presentation from the JVM Languages Summit 2008, Charles Nutter discusses bringing JRuby to the JVM, why Ruby is hard to implement, JIT compilation, precompilation, core Ruby implementation, Java library method access, method call semantics, scopes, open classes, heap-based frames, library challenges, strings, regexps, I/O, green threads, POSIX features, C lib support and future plans.
http://www.infoq.com/presentations/nutter-jruby-jvm-lang-summit

In this presentation from the JVM Languages Summit 2008, Cliff Click discusses how to optimize generated bytecode for running on the JVM. Click analyzes and reports on Java, Scala, Clojure, JRuby, JPC and JavaScript/Rhino and points out several places where each of them could increase their performance such as elimination of FixNums, escape analysis and best practices for testing bytecode.
Watch this video on infoq.com