How can I easily set (back) bundled JRuby interpreter?
NetBeans IDE 6.1
Choose Tools > Ruby Platforms from the main toolbar and select Built-in JRuby from the Platforms list.
To change the platform for a specific project, right-click the project's node and choose Properties. Select the Ruby Platform from the drop-down list.
NetBeans IDE 6.0
In the Ruby Options (Tools | Options | Ruby) delete the text in the Ruby Interpreter textfield and hit OK.