Installing JRuby 1.6.5.1 / Ruby 1.9.2 on Mac OSX Lion with RVM

install_jruby.sh

# Make sure to use RVM latest version
bash -s stable < <(curl -s https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer)

# You can check which known versions has RVM (make sure you can see jruby[-1.6.5.1])
rvm list known

# To install JRuby 1.6.5.1
rvm install jruby

# To start using it (with Ruby 1.9.2 instead of 1.8.7)
rvm jruby
rvm --default use jruby
export JRUBY_OPTS=--1.9

# We now need to make some changes to the Gemfile
# Remove gem 'ruby-prof' if you're using it as it seems to be incompatible with JRuby
# If you're using sqlite3, remove gem "sqlite3-ruby", :require => "sqlite3" and replace with:
# gem 'activerecord-jdbcsqlite3-adapter', :require => 'jdbc-sqlite3', :require =>'arjdbc'

# Installing the gems
gem update --system
gem install bundler
bundle install

# NOTE: If you're getting errors compiling native extension for the following gem, just remove it for now and execute bundle install again. I don't know how to make it work at the moment:
# gem 'ruby-debug19'

# Check environment
bundle exec ruby -v
# jruby 1.6.5.1 (ruby-1.9.2-p136) (2011-12-27 1bf37c2) (Java ...
bundle exec rails -v
# Rails 3.0.11