What is Rails4J ?

Rails4J is a very fast and small Java MVC framework :

• with convention over configuration approach
• Java-only
• following most of the Rails principles
• with minimum external dependencies

Rails4J is also optimized for running on Google App Engine (but not only) :

• application deploys itself in a few seconds (useful to deal with loading requests)

Documentation

You can start with the GettingStarted guide