Problem In Rails Server Command

Rails
1

Hello Everyone
I have install rails in my laptop. I am using Ubuntu Operating System.
I create an app using $ rails new abc
and then go to the abc folder and type rails server then i got error:

anurag@anurag-Compaq-Presario-CQ40-Notebook-PC:~/abc$ rails s
/home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/execjs-1.3.0/lib/execjs/
runtimes.rb:50:in autodetect': Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable) from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/execjs-1.3.0/lib/ execjs.rb:5:inmodule:ExecJS’
from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/execjs-1.3.0/lib/
execjs.rb:4:in <top (required)>' from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/coffee-script-2.2.0/ lib/coffee_script.rb:1:inrequire’
from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/coffee-script-2.2.0/
lib/coffee_script.rb:1:in <top (required)>' from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/coffee-script-2.2.0/ lib/coffee-script.rb:1:inrequire’
from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/coffee-script-2.2.0/
lib/coffee-script.rb:1:in <top (required)>' from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/coffee-rails-3.2.2/ lib/coffee-rails.rb:1:inrequire’
from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/coffee-rails-3.2.2/
lib/coffee-rails.rb:1:in <top (required)>' from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.22/lib/ bundler/runtime.rb:68:inrequire’
from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.22/lib/
bundler/runtime.rb:68:in block (2 levels) in require' from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.22/lib/ bundler/runtime.rb:66:ineach’
from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.22/lib/
bundler/runtime.rb:66:in block in require' from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.22/lib/ bundler/runtime.rb:55:ineach’
from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.22/lib/
bundler/runtime.rb:55:in require' from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/bundler-1.0.22/lib/ bundler.rb:122:inrequire’
from /home/anurag/abc/config/application.rb:7:in <top (required)>' from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/ rails/commands.rb:53:inrequire’
from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/
rails/commands.rb:53:in block in <top (required)>' from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/ rails/commands.rb:50:intap’
from /home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/
rails/commands.rb:50:in <top (required)>' from script/rails:6:inrequire’
from script/rails:6:in `’

2

On 1 March 2012 15:44, Anurag S. [email protected] wrote:

Hello Everyone
I have install rails in my laptop. I am using Ubuntu Operating System.
I create an app using $ rails new abc
and then go to the abc folder and type rails server then i got error:

anurag@anurag-Compaq-Presario-CQ40-Notebook-PC:~/abc$ rails s
/home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/execjs-1.3.0/lib/execjs/
runtimes.rb:50:in `autodetect’: Could not find a JavaScript runtime.
See GitHub - sstephenson/execjs: Run JavaScript code from Ruby for a list of available
runtimes. (ExecJS::RuntimeUnavailable)

Add to Gemfile
gem ‘execjs’
gem ‘therubyracer’
and then bundle install.

Colin

3

Is there permanent solution for that. You are saying that i have to
add each time these gem in my each new rails app.

4

On 1 March 2012 16:00, Anurag S. [email protected] wrote:

Is there permanent solution for that. You are saying that i have to
add each time these gem in my each new rails app.

That is a permanent solution. Hardly a big deal compared to the
amount of work required to develop the app itself. If you google a
bit you will find the background. I believe they are not put there by
default as there are other options, if you were using jRuby for
example I believe it would be different.

Colin

/home/anurag/.rvm/gems/ruby-1.9.2-p290/gems/execjs-1.3.0/lib/execjs/

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5

Thank You Colin

6

On Thu, Mar 1, 2012 at 5:00 PM, Anurag S. [email protected]
wrote:

Is there permanent solution for that. You are saying that i have to
add each time these gem in my each new rails app.

You will have to do something yes.

In the newer versions of Rails (4.0.0.beta) the

rubyracer

line is already there, but commented out.

What I do, is to take this order:

$ rails new name_of_app --skip-bundle
$ vim Gemfile # add “gem ‘therubyracer’”
$ bundle install

so I don’t have to wait 2 times for bundle install.

Actually, to not have to type --skip-bundle every time, I have this
.railsrc defaults file:

~$ cat ~/.railsrc
–skip-bundle
-T
-d postgresql

HTH,

Peter