Installing Rails on JRuby

1. Install the Rails Gem:

   jruby —S gem install rails

   You should see the following output, which tells you that six Gems and their documentation have been installed:

   JRuby limited openssl loaded. gem install jruby-openssl for full support.
   http://wiki.jruby.org/wiki/JRuby_Builtin_OpenSSL
   Successfully installed activesupport-2.1.1
   Successfully installed activerecord-2.1.1
   Successfully installed actionpack-2.1.1
   Successfully installed actionmailer-2.1.1
   Successfully installed activeresource-2.1.1
   Successfully installed rails-2.1.1
   6 gems installed
   Installing ri documentation for activesupport-2.1.1...
   Installing ri documentation for activerecord-2.1.1...
   Installing ri documentation for actionpack-2.1.1...
   Installing ri documentation for actionmailer-2.1.1...
   Installing ri documentation for activeresource-2.1.1...
   Installing RDoc documentation for activesupport-2.1.1...
   Installing RDoc documentation for activerecord-2.1.1...
   Installing RDoc documentation for actionpack-2.1.1...
   Installing RDoc documentation for actionmailer-2.1.1...
   Installing RDoc documentation for activeresource-2.1.1...

   The -S parameter that you used to run the command to install Rails tells JRuby to look for the script anywhere in the <JRUBY_HOME> path.