Oracle has an article on setting up Rails to work with Oracle on their site. Moreover, it’s written by the guy who literally wrote the book on Enterprise Java Beans (as well as JMS). Check out some of the praise he gives:
Ruby represents the culmination of 10 years of development without the tampering of commercial interests. As a result, Ruby is a delight to work with and, in many cases, is an order of magnitude more productive than Java, C, or Microsoft .NET languages.