Hi Folks, If you are doing any application in which you required JRuby as a platform. You can use Rails3.1 with that. activerecord-jdbc-adapter 1.2.0 is ok with that! All the steps are same as for the normal Rails Application You can find more details here http://blog.jruby.org/2011/09/ar-jdbc-1-2-0-released/   Cheers, Arun