You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: user_mailer.rb
    path of file: ./repos/archivesspace/backend/app/lib
    
    the code of the file until where you have to start completion: require 'action_mailer'
require 'java'

class UserMailer < ActionMailer::Base

  def initialize
    super
    update_view_path
  end

  class MailError < StandardError
  end

  def headers
    delivery_method = ActionMailer::Base.delivery_
    
  def update_view_path
    view_path = File.join(ASUtils.find_base_directory, 'backend', 'app', 'views')

    # above method does not work when running in Jetty
    unless File.exist?(view_path)
      view_path = File.join('app', 'views')
    end

    self.append_view_path(view_path)
  end