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1) Create a new Ruby on Rails application, specifying JRuby as your interpreter and GlassFish v3 as your server. 2) Under "Tools -> Servers -> GlassFish v3 Prelude -> JRuby", set "Deploy All Rails Applications To Root Context (/)" to on (checked). 3) Right-click on your application in the Projects pane, and choose "Run" Observe that in the server output you see "INFO: Loading Rails application YourApplication at /" Observe that NetBeans then points your browser at "http://localhost:8080//". Note the additional "/" on the URL. It's harmless, but it is probably unintentional.
this isn't likely to be addressed in 7.0
NetBeans.org Migration: changing resolution from LATER to WONTFIX