JRuby startup under load causes invalid LoadError - no such file to load

autoload_patch.rb

# Fixes  "LoadError" "no such file to load" on JRuby 1.7
# Place at the top of application.rb
# Override Kernel#autoload and Module#autoload to #require when Web Server or Worker
# so that classes are all loaded in highly concurrent environments
# Also forces the code to be loaded up front instead of on demand in production
begin
  # Since Rails has not yet been loaded we have to use the env vars
  rails_env = ENV["RAILS_ENV"] || ENV["RACK_ENV"] || "development"

  if (['production', 'release', 'hotfix'].include?(rails_env))
    def Kernel
      def autoload(module_, filename)
        require filename
      end
    end
    def Module
      def autoload(module_, filename)
        require filename
      end
    end
  end
end