See the following:
Related documentation: Getting Started With JRuby on Rails for Sun GlassFish Enterprise Server v3 Prelude
Blog post: “New and Improved GlassFish Gem” (http://weblogs.java.net/blog/vivekp/archive/2008/11/new_and_improve_1.html)
Getting Started Guide: http://wiki.glassfish.java.net/Wiki.jsp?page=GettingStartedGuide
Gem documentation: http://glassfishgem.rubyforge.org
Warbler information: http://caldersphere.rubyforge.org/warbler/
Related screencasts: http://wiki.glassfish.java.net/Wiki.jsp?page=Screencasts