execJs Could not find a JavaScript runtime but execjs AND therubyracer are in Gemfile

Question

I m getting this error       rake aborted    Could not find a JavaScript runtime  See https   github com sstephenson execjs     I have already spent more hours searching google then I am willing to admit  I believe this is an execJs bug   From all the posts  this is a very common issue with rails 3 1  A js runtime is now needed by what are now standard gems like coffee-script and sass   Most of these cases were resolved by adding the gems  execjs  and  therubyracer  to the app Gemfile  and then running  bundle update  and or  bundle install    But not for me   I guess I got lucky   I am running rails 3 1 3 ruby 1 9 on an old version of Redhat Linux 4  2 6 9-101 ELsmp  and gcc is 3 4 6     Other reported fixes don t help  I am unable to install  nodejs    johnson   or  mustang   the other runtimes execJs is supposed to locate and use   They won t make install on my system   I need to fix the problem causing execJs to fail to locate  therubyracer   Here is the Gemfile  and bundle install says Ok    source  http   rubygems org   gem  rails    3 1 3  gem  sqlite3  gem  sho-mongrel   gem  execjs  gem  therubyracer   gem  therubyracer    require   gt   v8   group  assets do   gem  sass-rails        gt  3 1 5    gem  coffee-rails      gt  3 1 1    gem  uglifier     gt   1 0 3  end   And here is a trace     rails 316-private-pub chatter-after gt rake db create --trace rake aborted  Could not find a JavaScript runtime  See https   github com sstephenson execjs for a list of available runtimes   usr local lib ruby gems 1 9 1 gems execjs-1 3 0 lib execjs runtimes rb 50 in  autodetect   usr local lib ruby gems 1 9 1 gems execjs-1 3 0 lib execjs rb 5 in   lt module ExecJS gt    usr local lib ruby gems 1 9 1 gems execjs-1 3 0 lib execjs rb 4 in   lt top  required  gt    usr local lib ruby gems 1 9 1 gems bundler-1 0 21 lib bundler runtime rb 68 in  require   usr local lib ruby gems 1 9 1 gems bundler-1 0 21 lib bundler runtime rb 68 in  block  2 levels  in require   usr local lib ruby gems 1 9 1 gems bundler-1 0 21 lib bundler runtime rb 66 in  each   usr local lib ruby gems 1 9 1 gems bundler-1 0 21 lib bundler runtime rb 66 in  block in require   usr local lib ruby gems 1 9 1 gems bundler-1 0 21 lib bundler runtime rb 55 in  each   usr local lib ruby gems 1 9 1 gems bundler-1 0 21 lib bundler runtime rb 55 in  require   usr local lib ruby gems 1 9 1 gems bundler-1 0 21 lib bundler rb 122 in  require   home vitalarthur rails 316-private-pub chatter-after config application rb 7 in   lt top  required  gt    usr local lib ruby site ruby 1 9 1 rubygems custom require rb 36 in  require   usr local lib ruby site ruby 1 9 1 rubygems custom require rb 36 in  require   home vitalarthur rails 316-private-pub chatter-after Rakefile 5 in   lt top  required  gt    usr local lib ruby gems 1 9 1 gems rake-0 9 2 2 lib rake rake module rb 25 in  load   usr local lib ruby gems 1 9 1 gems rake-0 9 2 2 lib rake rake module rb 25 in  load rakefile   usr local lib ruby gems 1 9 1 gems rake-0 9 2 2 lib rake application rb 501 in  raw load rakefile   usr local lib ruby gems 1 9 1 gems rake-0 9 2 2 lib rake application rb 82 in  block in load rakefile   usr local lib ruby gems 1 9 1 gems rake-0 9 2 2 lib rake application rb 133 in  standard exception handling   usr local lib ruby gems 1 9 1 gems rake-0 9 2 2 lib rake application rb 81 in  load rakefile   usr local lib ruby gems 1 9 1 gems rake-0 9 2 2 lib rake application rb 65 in  block in run   usr local lib ruby gems 1 9 1 gems rake-0 9 2 2 lib rake application rb 133 in  standard exception handling   usr local lib ruby gems 1 9 1 gems rake-0 9 2 2 lib rake application rb 63 in  run   usr local lib ruby gems 1 9 1 gems rake-0 9 2 2 bin rake 33 in   lt top  required  gt    usr local bin rake 19 in  load   usr local bin rake 19 in   lt main gt     There is nothing interesting in the development log   Here is the execjs dir    usr local lib ruby gems 1 9 1 gems execjs-1 3 0 lib execjs gt ls disabled runtime rb  module rb              ruby rhino runtime rb  version rb external runtime rb  mustang runtime rb     runtimes rb johnson runtime rb   ruby racer runtime rb     I have also tried execjs-1 2 13   Same problem   If I comment execjs rb below  I can run rake without the error   require  execjs module  require  execjs runtimes   module ExecJS   self runtime      Runtimes autodetect end   But then I don t get a runtime   I can see where the error text comes from in runtimes rb   def self autodetect   from environment    best available        raise RuntimeUnavailable   Could not find a JavaScript runtime             See https   github com sstephenson execjs for a list of available runtimes    end   So the question is  since I do have  therubyracer  installed  why can t runtimes rb find it  Is execJs broken    Here it  therubyracer     usr local lib ruby gems 1 9 1 gems therubyracer-0 9 9   How can I fix this

User · Answer

I had this occur to me on my Windows machine  turns out the problem was quite different  I had accidentally removed some paths from my  PATH  variable  Simply restarting the command prompt solved it  It seems as though there was a JS runtime in one of those missing paths

User · Answer

Ubuntu Users   I had the same problem and I fixed it by installing nodejson my system independent of the gem   on ubuntu its   sudo apt-get install nodejs  I m using 64bit ubuntu 11 10  update  From  Galina  s answer below I m guessing that the latest version of nodejs is required  so  steve98177 your best option on a redhat or CentOS  box is to install from source code as  Galina did  but as you can t  make install  on this box    I suggest you try to install a fedora rpm long shot  https   github com joyent node wiki Installing-Node js-via-package-manager or find another RH CentOs box that you can  make  on  and create your own rpm and install on original RH box if old glibc on RH plays nice      The real issue here IMHO  is installing Gems that have dependencies on installed packages outside of the ruby environment  is there a way of knowing before installing   an RFI for Gems or bundler      CentOS RedHat Users   sudo yum install nodejs

User · Answer

when i generate rails g controller i got the same error  After that when do the following changes on Gemfile in rails 4  everything went smooth The changes i made was  gem  execjs  gem  therubyracer    0 11 4  After that i can able to run the server and able to do all basic operations on the application

User · Answer

I had the same problem  Adding the gems  execjs  and  therubyracer  not work for me   apt-get install nodejs - also dosn t works  I m using 64bit ubuntu 10 04   But it helped me the following   1  I created empty folder  for example  java     2  From the terminal in folder that I created I do     git clone git   github com ry node git   cd node     configure   make   sudo make install   After that I run  bundle install  as usual  from folder with ruby amp rails project   And the problem was resolved  Ruby did not have to reinstall

User · Answer

I am using Ubuntu 11 10- 32 bit with ruby 1 9 3p194  rails 3 2 3  gem 1 8 24  Was receiving the same Javascript error while running  script rails console     However doing a  sudo apt-get install nodejs  solved my issue

User · Answer

In my case running the bundle command did the trick  I trust they find each other then

User · Answer

When you create an empty project  this line is commented in Gemfile  Just uncomment it and bundle   gem  therubyracer    platforms   gt   ruby

User · Answer

This is the link I needed to fix the problem  install nodejs   https   github com joyent node wiki Installing-Node js-via-package-manager

User · Answer

add in your gemfile which is in the folder you have created  gem  execjs   gem  therubyracer

User · Answer

Try installing NodeJS and try again   https   github com joyent node wiki Installing-Node js-via-package-manager

User · Answer

Fedora users WILL NOT be able to do a simple  yum install nodejs  due to serious naming and file placement conflicts that prevent this package from even being available through the Fedora repositories   There is apparently at least one alternate repository available with an alternate build that may work  but that s two too many  alternates  for me to be willing to use it-- I m looking for another alternative

User · Answer

If you were on ubuntu    sudo apt-get install nodejs  Try to don t use another systems like Windows to development  Think that almost all servers in the world are Linux servers  so when you try to deploy that application it will be easier if you have developed that on a Linux or Unix environment too

User · Answer

I have pulled my hair out with this error a few time   I have managed to make it sometime disappear by restarting Apache Nginx     So I fixed it the same way as above  by adding the following to the GEM file   gem  execjs  gem  therubyracer    platforms   gt   ruby   and then I DELETED my gemfile lock file and then reran  bundle install    I found only then did  bundle install  actually install the correct libraries etc

User · Answer

I had this problem when using RubyMine  6 3 3   One day I tried to run my code  but it didn t work and complained about no JavaScript runtime found  I was able to run rails s though  The fix for me was creating a new Run configuration  Seems really bizarre that the Run configuration would become corrupt

User · Answer

On Ubuntu  I had to sudo apt-get update and then the nodejs install worked

User · Answer

In your gemfile add   gem  execjs  gem  therubyracer    platforms   gt   ruby   For more details   ExecJS and could not find a JavaScript runtime

User · Answer

I had similar issues on ubuntu 12 04  Installing Node js fixed it

User · Answer

I had the same problem on a staging server  I had no issues running rake tasks on my local development machine  but deploying to the staging server failed with the  Could not find a JavaScript runtime  error message while trying to run the assets precompile rake task   Of course  therubyracer and execjs were in my Gemfile  and I was using the latest versions  My Gemfile lock files matched  and I further verified versions by running bundle show   After searching around on Google  I ended up deleting all of my gems and reinstalling them which fixed the problem  I still don t know what the root cause was  but maybe this will help you   Here s what my environment looks like  BTW   Ubuntu 10 04 3 LTS rbenv Ruby 1 9 2-p290 bundler-1 0 21 execjs-1 3 0 therubyracer-0 9 9

[ruby-on-rails] execJs: 'Could not find a JavaScript runtime' but execjs AND therubyracer are in Gemfile

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