Windows 上的 RuntimeError 尝试遵循 rubylessons

更新: 科林关于删除//= request _ tree 行的建议修复了这个问题。

我已经浪费了超过2天的时间,试图遵循每一个建议,并解决我的问题。我试图按照 http://ruby.railstutorial.org书上的窗口机器,不能为我的生活得到过去以下讨厌的错误。

ExecJS::RuntimeError in Static_pages#home


Showing C:/Users/.../bootcamp-sample-app/app/views/layouts/application.html.erb where line #6 raised:


["ok","(function() {\n\n\n\n}).call(this);\n"]
(in C:/Users/.../bootcamp-sample-app/app/assets/javascripts/sessions.js.coffee)
Extracted source (around line #6):


3: <head>
4:   <title><%= full_title(yield(:title)) %></title>
5:   <%= stylesheet_link_tag    "application", media: "all" %>
6:   <%= javascript_include_tag "application" %>
7:   <%= csrf_meta_tags %>
8:   <%= render 'layouts/shim' %>
9: </head>
Rails.root: C:/Users/.../bootcamp-sample-app


Application Trace | Framework Trace | Full Trace
app/views/layouts/application.html.erb:6:in `_app_views_layouts_application_html_erb___487732698_30422172'
Request

我已经尝试了所有的建议,包括用 msi 安装 nodejs,使用 Execjs1.3.0和其他我已经不记得的东西。这是 Gem 文件

source 'https://rubygems.org'


gem 'rails', '3.2.8'
gem 'bootstrap-sass', '2.0.0'
gem 'bcrypt-ruby', '3.0.1'
gem 'faker', '1.0.1'
gem 'will_paginate', '3.0.3'
gem 'bootstrap-will_paginate', '0.0.6'


group :development, :test do
gem 'sqlite3', '1.3.5'
gem 'rspec-rails', '2.10.0'
gem 'guard-rspec', '0.5.5'
gem 'guard-cucumber'
end


group :development do
gem 'annotate', '2.5.0'
end




# Gems used only for assets and not required
# in production environments by default.
group :assets do
gem 'sass-rails'
gem 'coffee-rails'
gem 'coffee-script'
gem 'uglifier'
end


gem 'jquery-rails', '2.0.2'


gem 'execjs'


# Gems on Linus/Mac
#gem 'therubyracer'




group :test do
gem 'capybara', '1.1.2'
gem 'guard-spork', '0.3.2'
gem 'spork', '0.9.0'
gem 'factory_girl_rails', '1.4.0'
gem 'cucumber-rails', '1.2.1', require: false
gem 'database_cleaner', '0.7.0'




# Test gems on Linux
#  gem 'rb-inotify', '0.8.8'
#  gem 'libnotify', '0.5.9'


# Test gems on Macintosh OS X
#  gem 'selenium-webdriver', '~> 2.22.0'
#  gem 'rb-fsevent', '0.9.1', :require => false
#  gem 'growl', '1.0.3'


# Test gems on Windows
# gem 'rb-fchange', '0.0.5'
# gem 'rb-notifu', '0.0.4'
# gem 'win32console', '1.3.0'
end


group :production do
#  gem 'therubyracer'
gem 'pg', '0.12.2'
end


# To use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.0.0'


# To use Jbuilder templates for JSON
# gem 'jbuilder'


# Use unicorn as the app server
# gem 'unicorn'


# Deploy with Capistrano
# gem 'capistrano'


# To use debugger
#gem 'debugger''

这是 疗程 JS 咖啡

# Place all the behaviors and hooks related to the matching controller here.
# All this logic will automatically be available in application.js.
# You can use CoffeeScript in this file: http://jashkenas.github.com/coffee-script/

Application. js

// This is a manifest file that'll be compiled into application.js, which will include all the files
// listed below.
//
// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, vendor/assets/javascripts,
// or vendor/assets/javascripts of plugins, if any, can be referenced here using a relative path.
//
// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
// the compiled file.
//
// WARNING: THE FIRST BLANK LINE MARKS THE END OF WHAT'S TO BE PROCESSED, ANY BLANK LINE SHOULD
// GO AFTER THE REQUIRES BELOW.
//
//= require jquery
//= require jquery_ujs
//= require_tree .
//= require bootstrap

Application.html.erb

<!DOCTYPE html>
<html>
<head>
<title><%= full_title(yield(:title)) %></title>
<%= stylesheet_link_tag    "application", media: "all" %>
<%= javascript_include_tag "application" %>
<%= csrf_meta_tags %>
<%= render 'layouts/shim' %>
</head>
<body>
<%= render 'layouts/header' %>
<div class="container">
<%= yield %>
<%= render 'layouts/footer' %>
</div>
</body>
</html>

这里是 控制台内容

Processing by StaticPagesController#home as HTML
Rendered static_pages/home.html.erb within layouts/application (45.0ms)
Completed 500 Internal Server Error in 1136ms


ActionView::Template::Error (["ok","(function() {\n\n\n\n}).call(this);\n"]
(in C:/Users/.../bootcamp-sample-app/app/assets/javascripts/sessions.js.coffee)):
3: <head>
4:   <title><%= full_title(yield(:title)) %></title>
5:   <%= stylesheet_link_tag    "application", media: "all" %>
6:   <%= javascript_include_tag "application" %>
7:   <%= csrf_meta_tags %>
8:   <%= render 'layouts/shim' %>
9: </head>
app/views/layouts/application.html.erb:6:in `_app_views_layouts_application_html_erb___487732698_30422172'




Rendered C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/templates/rescues/_trace.erb (2.0ms)
Rendered C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.0ms)
Rendered C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/middleware/templates/rescues/template_error.erb within rescues/layout (34.0ms)

我已经安装了 Devkit,并尝试了各种宝石,但请建议的变化,可以帮助我开发的窗口。我什么都用安装程序。

我错过了什么?

75801 次浏览

Quick and dirty solution: remove //= require_tree . from application.js.

As I explain in the comments for the question, this doesn't actually solve the underlying issue that is causing the error, but merely sidesteps it.

I had this problem and was scowering the internet I am running Windows 8 with this rails gem file

source 'https://rubygems.org'


gem 'rails', '3.2.9'


# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'


group :development do gem 'sqlite3', '1.3.5'
end


# Gems used only for assets and not required # in production environments by default.


group :assets do
gem 'sass-rails', '3.2.5'
gem 'coffee-rails', '3.2.2'


gem 'uglifier', '1.2.3'
end


gem 'jquery-rails', '2.0.2'


group :production do
gem 'pg', '0.12.2'
end

Went to http://nodejs.org/download/ installed - restarted the machine and everything worked.

My friend was attempting a Rails tutorial on Win 8 RTM a few months ago and ran into this error. Not sure if this issue exists in Windows 7 as well, but this may help.

Options:

1) Removing //= require_tree . / Ignoring the issue - As ColinR stated above, this line should not be causing an issue in the first place. There is an actual problem with ExecJS working properly with the JavaScript runtime on your system and removing this line is just ignoring that fact.

2) Installing Node.js / Running away - Many people seem to just end up installing Node.js and using that instead of the JavaScript runtime already on their system. While that is a valid option, it also requires additional software and only avoids the original issue, which is that ExecJS is not working properly with the JavaScript runtime already on your system. If the existing JavaScript runtime on your system is supposed to work, why not make it work instead of installing more software? According to the ExecJS creator, the runtime already built into Windows is in fact supported...

ExecJS lets you run JavaScript code from Ruby. It automatically picks the best runtime available to evaluate your JavaScript program, then returns the result to you as a Ruby object.

ExecJS supports these runtimes:

  • therubyracer - Google V8 embedded within Ruby
  • therubyrhino - Mozilla Rhino embedded within JRuby
  • Node.js
  • Apple JavaScriptCore - Included with Mac OS X
  • Microsoft Windows Script Host (JScript)

(from github.com/sstephenson/execjs#execjs )

3) Actually fixing the issue / Learning - Use the knowledge of options 1 and 2 to search for other solutions. I can't tell you how many webpages I closed upon seeing options 1 or 2 was the accepted solution before actually finding information about the root issue we were having. The only reason we kept looking was that we couldn't believe the Rails team would (1) insert a line of code in every scaffold generated project that caused an issue, or (2) require that we install additional software just to run that default line of code. And so we eventually arrived at a fix for our root issue (your miles may vary).

The Fix that worked for us: On the system having issues, find ExecJS's runtimes.rb file. It looks like this. Make a copy of the found file for backup. Open the original runtimes.rb for editing. Find the section that starts with the line JScript = ExternalRuntime.new(. In that section, on the line containing :command => "cscript //E:jscript //Nologo //U", - remove the //U only. Then on the line containing :encoding => 'UTF-16LE' # CScript with //U returns UTF-16LE - change UTF-16LE to UTF-8 . Save the changes to the file. This section of the file should now read:

JScript = ExternalRuntime.new(
:name        => "JScript",
:command     => "cscript //E:jscript //Nologo",
:runner_path => ExecJS.root + "/support/jscript_runner.js",
:encoding    => 'UTF-8' # CScript with //U returns UTF-16LE
)

Next, stop then restart your Rails server and refresh the page in your browser that produced the original error. Hopefully the page loads without error now. Here's the ExecJS issue thread where we originally posted our results: https://github.com/sstephenson/execjs/issues/81#issuecomment-9892952

If this did not fix the issue, you can always overwrite the modified runtimes.rb with the backup copy you (hopefully) made and everything will be back to square one. In that case, consider option 3 and keep searching. Let us know what eventually works for you.. unless it's removing the require_tree or installing node.js, there's plenty of that going around already. :)

I had to add my nodejs folder to my Windows Path environment variable. In Windows 8 open the Control Panel, go to System, Advanced system settings (on the left), click Environment Variables on the left, and edit the Path variable to include the directory to your nodejs folder (probably in Program Files).

Of course you have to have Node.js installed (use the Windows installer) and have installed CoffeeScript through NPM.

Here's a less complicated solution, for beginners:

If you are just working through the tutorial, you are probably working with the default Gemfile (or very nearly). You can open it up in your text editor, and remove the pound sign from the front of this line:

# gem 'therubyracer', :platforms => :ruby

You will need to re-run bundle install, which will likely download a few things. But once it does, you should be able to start the server without any problem.

At least, that worked for me.

This also works on Ubuntu 12.04, by the way.

Had the same issue OS- Windows 8 Error- 'ExecJS::RuntimeError...' Solution- missing Node.js

  1. install Node.js from http://www.nodejs.org/download/
  2. Restart the computer

I favoured the Learning route. It seems the problem stems from

IO.popen(command, options) { |f| output = f.read }

returning an empty string in execjs\external_runtine.rb (line 173 in version 1.4.0). This is why the error message contains no text. The changes suggested did not work for me. I changed UTF-16LE to UTF-8, but it still returned an empty string. I removed \\U from the command - this at least returned text, but it was in the wrong encoding - in the browser it displayed as Chinese characters.

According to this MSDN blog post, using the //U flag and redirecting to a file causes cscript to return the result using UTF-16.

And then, magically, it worked (@#%$&^@$%!!!?!?!) using command as "cscript //E:jscript //Nologo" and encoding as "UTF-8". Oh well.

I know this is a very late answer for this issue, but I got on something similar and went down the full path to understand what was really causing the issue.

Turned out that the default windows jscript engine is still on es3, and many gems are taking advantage of es5 or es6 features. Unfortunately if this happen (you are using a gem or a piece of code that leverage es5 or es6 features), there is no way to let it work on windows with the native js engine.

This is the reason why installing node.js solves the problem (node is at least es5).

Hope this can help some folks struggling with a runtime error of jsexec.

My 2 cents advise is to install node(very easy) or install v8, and not removing the //=require_tree.

Note execjs will automatically use node if detected. Otherwise force its use, adding in boot something like:

ENV['EXECJS_RUNTIME'] = 'Node'

To set the env to node.

For beginners like me:

  1. Navigate to \app\views\layouts\application.html.erb
  2. Change line 6 from:

    '<%= javascript_include_tag 'application', 'data-turbolinks-track' => true %>'

to

<%= javascript_include_tag 'defaults', 'data-turbolinks-track' => true %>

Source from tutorial to fix here

For windows users, this may work. There is a problem with coffee-script-source >1.9.0 running on windows.

It seems you have to add this to your gemfile:

gem 'coffee-script-source', '1.8.0'

then do

bundle update coffee-script-source

I tried all the above options, and also mixed up a few combinations of them, till I found this Rails-4, ExecJS::ProgramError in Pages#welcome and had done multiple system gem updates and bundle installs and updates.

I reverted all my trials and downgraded my coffee-script-source and it works. Posting here to help out anyone else, who may have a similar issue.

Updating files in vendor/cache

coffee-script-source-1.8.0.gem Removing outdated .gem files from vendor/cache coffee-script-source-1.9.1.1.gem Bundle updated!

Running Win 8 64 bit rails 4.2.5 ruby 2.1.7

This one worked for me

I used the solution number 2 because previously i had have this mistake, but in this ocation didn't work, then I added the

gem 'coffee-script-source', '1.8.0'

and run

bundle install

and my problem was fixed

Did you change the location of your code from C:\Users\this-user\yo-app?

When I was young in rails I have created an app and the default location of my app was C:\Users\Duncan\my-app and then, when I changed my-app and placed it in D:\All-my-Apps-folder i had that error....

I scratched my head, tried 1,2,3 and more .....nothing! Until I returned all code to default folder location and to my amazement, I was rolling again :)

In case someone may find this useful (I can't explain why that happened, maybe someone may without speculation)