Ruby on Rails projects usually use MySQL or PostgreSQL for their database, but in the corporate world, Oracle is king. As much as you might like to have a Postgres backend, the powers-that-be have decreed and you must obey. Don’t worry though, all is not lost, you don’t have to slink back to Java, here is how you can get your Rails app working with an Oracle database and deploy it all to Tomcat as a Java webapp if that wasn’t enough.