maven support for rubygems based on maven 3.0. it allows to use xyz.gemspec file as pom file or the usual pom.xml files. with a rails3 application with a Gemfile (suitable for jruby). you need java installed or jruby but it will run with MRI (without installed jruby) since the maven will take care of the jruby to use.
Gemfile gem 'ruby-maven', '~> 22.214.171.124.3'
install gem install ruby-maven -v 126.96.36.199.3