Rails vs. Grails vs. Helma: The JVM Web Framework Smackdown, Part 1 | Linux Magazine

To test JRoR, Grails, and Helma, let’s build a music site from scratch with each framework. The sample site, PenguinMusic (shown), allows users to browse songs ordered by popularity, view details about an artist and album, and leave comments if logged in to the application. The application also handles user registration.
(Link: Rails vs. Grails vs. Helma: The JVM Web Framework Smackdown, Part 1 | Linux Magazine)