After five month since JRuby 1.4 release we have JRuby 1.5 delivered.

It’s good that Rails framework users are not only limited to official Ruby language implementations like Ruby 1.8.x or 1.9.1/2 but can go with other implementations that offer as well as the official one: stability, reliability and performance, much needed in Ruby on Rails applications.

The secret of JRuby performance and stability dwells in using the Java Virtual Machine, which has provided JRuby’s developers with a solid base to optimize how Ruby is implemented, a base that of course is next being used by Rails framework., making it robust and fast.

Good news, aside from Ruby on Rails 3.0 support and updates to standard library, RubyGems, RSpec and other overall performance improvements is significantly improved Windows support.

You may find a lot of benchmarks of JRuby and Ruby on Rails framework, indicating great performance of both the implementation of Ruby language and Ruby on Rails framework running on it. Trying out JRuby might be also worth for another reason – when someday you will be faced with “Java-only” requirement.