Why can't my NetBeans JRuby on Rails project see the ssl_requirement module?

I am using the NetBeans IDE 6.9.1 for working on a JRuby on Rails application I inherited. Due to security requirements, I am attempting to force SSL for the entire application. Following the recommendation in "Agile Web Development with Rails", I have included the ssl_requirement gem in my project. I can right-click on Libraries in the Projects tab and verify that ssl_requirement is included.

As recommended, I have included the module in my base controller as follows:

class ApplicationController < ActionController::Base
  include SslRequirement
  # ...
end

However开发者_高级运维, whenever I try to start the application, I always get this error message

uninitialized constant ApplicationController::SslRequirement

I have searched all over the web, and cannot find any guidance as to what I might have done wrong here, other than to "restart the server." Believe me, I've tried that.

My failure was unfamiliarity with how gems are included in code. The book failed to mention that I needed to also put

require 'ssl_requirement'

in the code file, presumably because ruby developers usually know to do that.