Sun Web 2.0 tech is easy

Two following links describe how to achieve famous Ruby on Rails rapid development on Java platform using Sun tools - Netbeans and GlassFish. Among pros there are really fast setup, high performance (due to clustering) and flexibility (mix Java and Ruby):

• Developing MySQL-Backed Applications with Netbeans, JRuby-on-Rails & Glassfish (needs registration)
  
• GlassFish Clustering In Under 10 Minutes (also high-resolution version is available - the link is right after the movie window)