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BitNami JRubyStack greatly simplifies the development and deployment of JRuby on Rails applications. It includes ready-to-run versions of Tomcat, MySQL, JRuby and Rails and required dependencies, as well as the Amazon AWS PHP SDK for developing applications for the Amazon Cloud. It can be deployed using a native installer, as a virtual machine or as a AMI to the Amazon cloud. BitNami JRubyStack is distributed for free under the Apache 2.0 license.

With JRubyStack you can:
Develop your JRuby on Rails application using Java from Ruby.
Launch your application with the GlassFish server thanks to the GlassFish gem.
Make a .war file out of your application in 3 simple steps (see Quick Start Guide for details).
Deploy it to the bundled Tomcat.
Commit and Checkout your code with the subversion client.

JRuby is a 100% Java implementation of the Ruby programming language. It is Ruby for the JVM. JRuby provides a complete set of core “builtin” classes and syntax for the Ruby language, as well as most of the Ruby Standard Libraries. Rails is a full-stack MVC framework for database-backed web applications that is optimized for programmer happiness and sustainable productivity.