In JRuby-on-Rails tutorial at Rails Conf 2009, Nick Sieger shared a nice little tip on how to configure "database.yml" to be usable with both JRuby and MRI:

<% jdbc = defined?(JRUBY_VERSION) ? 'jdbc' : '' %> development:   adapter: <%= jdbc %>mysql   encoding: utf8   reconnect: false   database: myapp_development   pool: 5   username: root   password:   socket: /tmp/mysql.sock # ...

"JRUBY_VERSION" is defined only if your using JRuby and so the right database adapter is picked up accordingly.

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