initialize

# File railties/lib/rails/engine.rb, line 439
    def initialize
      @_all_autoload_paths = nil
      @_all_load_paths     = nil
      @app                 = nil
      @config              = nil
      @env_config          = nil
      @helpers             = nil
      @routes              = nil
      @app_build_lock      = Mutex.new
      super
    end