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: generate_backend.rb
    path of file: ./repos/shoes4/shoes-swt/lib/shoes/swt
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require 'rbconfig'

class Sho
    
      def validate
        return if RUBY_ENGINE == "jruby"

        puts <<~EOS

          *******************************************************************************
          The shoes-swt backend requires a 9.X version of JRuby.

          You are running the following Ruby instead:

            #{RUBY_DESCRIPTION}

          Please download JRuby from http://jruby.org (or your favorite Ruby version
          manager), then check our https://github.com/shoes/shoes4#installing-shoes-4 to
          get Shoes installed.

          Sorry for the inconvenience!
          *******************************************************************************

EOS
        exit 1
      end

      def generate(path)
        options = "-J-XstartOnFirstThread" if RbConfig::CONFIG["host_os"] =~ /darwin/

        "jruby #{options} #{path}/shoes-swt"
      end
    end