jruby - Myapp::Application::Railties constant missing with Rails 4 beta and Jruby jruby-1.7.2

Question

I couldn't get jruby to work with Rails 4 without a hack:

In railties/lib/rails/engine.rb, I had to initialize Railties with const_get, otherwise

def railties
  @railties ||= self.class.const_get(:Railties).new
  # @railties ||= self.class::Railties.new
 end

Otherwise I get this:

./bin/rake rake aborted! uninitialized constant Myapp::Application::Railties org/jruby/RubyModule.java:2677:in const_missing' /Volumes/Opt/rails/rails-edge/railties/lib/rails/engine.rb:469:inrailties' /Volumes/Opt/rails/rails-edge/railties/lib/rails/application.rb:241:in run_tasks_blocks' /Volumes/Opt/rails/rails-edge/railties/lib/rails/engine.rb:444:inload_tasks' org/jruby/RubyBasicObject.java:1659:in __send__' org/jruby/RubyKernel.java:2086:insend' /Volumes/Opt/rails/rails-edge/railties/lib/rails/railtie/configurable.rb:30:in method_missing' /Volumes/Opt/projects/myapp/Rakefile:6:in(root)' org/jruby/RubyKernel.java:1046:in `load'

Rails itself won't start up for the same reason. Is this the correct fix or did I mask some underlying problem?

Answer 1

并没有真正解决问题，但我补充说

Rails::Engine.class_eval do
  def railties
    @railties ||= self.class.const_get(:Railties).new
  end
end

下Bundler.requireinapplication.rb以避免更改原始文件。

Answer 2

这似乎已通过向 Rails master 提交（对引擎的小改动）得到修复：https ://github.com/rails/rails/commit/45aabe61520cbb4bd74f6de7dc1023d2ca071e40

我刚刚补充说：

gem 'rails', :git => 'git://github.com/rails/rails.git'  

要不就

gem 'rails', github: 'rails/rails'

到我的 Gemfile 来下载最新版本的 Rails，这样就成功了。能够删除亚历克斯（很好 - 谢谢！）的黑客攻击，一切正常。