JRuby 0.9.1

JRuby is a pure Java implementation of the Ruby interpreter, being developed by the JRuby team.
JRuby is free software released under a dual LGPL/GPL license.
JRuby is tightly integrated with Java to allow both to script any Java class and to embed the interpreter into any Java application.
Main features:
- Ruby 1.6.7 compatible interpreter. (Not all builtin classes are supported yet!)
- Working towards full compatibility with Ruby 1.8.1.
- Support for scripting Java classes and interfaces in JRuby.
- Bean Scripting Framework (BSF) support.
Enhancements:
- Overall performance is 50-60% faster than 0.9.0.
- Improved Rails support.
- A new syntax for including Java classes into Ruby.
- A new interpreter design.
- Refactoring of the method dispatch, code evaluation, and block dispatch code.
- Parser performance enhancements.
- Rewriting of Enumerable and StringScanner in Java.
- New experimental syntax for implementing interfaces.
- 86 Jira issues have been resolved since 0.9.0.