# File lib/rhc/rest/application.rb, line 181
      def find_environment_variables(env_var_names=nil)
        return environment_variables if env_var_names.nil?
        env_var_names = [env_var_names].flatten
        debug "Finding environment variable(s) #{env_var_names.inspect} in app #{@name}"
        env_vars = environment_variables.select { |item| env_var_names.include? item.name }
        raise RHC::EnvironmentVariableNotFoundException.new("Environment variable(s) #{env_var_names.join(', ')} can't be found in application #{name}.") if env_vars.empty?
        env_vars
      end