Redmine

• output of `ruby bin/about`
  

  Environment:
    Redmine version                3.3.2.devel.16343
    Ruby version                   2.0.0-p648 (2015-12-16) [x86_64-linux]
    Rails version                  4.2.8
    Environment                    production
    Database adapter               Mysql2
  SCM:
    Subversion                     1.7.14
    Git                            1.8.3.1
    Filesystem
  Redmine plugins:
    no plugin installed
  

  • OS: CentOS 7.3

I cannot reproduce.
activesupport 4.2.7.1 requires json gem.
https://github.com/rails/rails/blob/v4.2.7.1/activesupport/activesupport.gemspec#L24

Toshi MARUYAMA wrote:

activesupport 4.2.7.1 requires json gem.
https://github.com/rails/rails/blob/v4.2.7.1/activesupport/activesupport.gemspec#L24

This json gem requiring is removed in activesupport 4.2.8.
https://github.com/rails/rails/commit/89a532dfaf5910891ea3acd77d36fbaa4cb8fd0b

The error message is:

rake aborted!
LoadError: cannot load such file -- json
/usr/local/share/gems/gems/activesupport-4.2.8/lib/active_support/core_ext/object/json.rb:2:in `require'
/usr/local/share/gems/gems/activesupport-4.2.8/lib/active_support/core_ext/object/json.rb:2:in `<top (required)>'
/usr/local/share/gems/gems/activesupport-4.2.8/lib/active_support/core_ext/object.rb:12:in `require'
/usr/local/share/gems/gems/activesupport-4.2.8/lib/active_support/core_ext/object.rb:12:in `<top (required)>'
/usr/local/share/gems/gems/railties-4.2.8/lib/rails/configuration.rb:2:in `require'
/usr/local/share/gems/gems/railties-4.2.8/lib/rails/configuration.rb:2:in `<top (required)>'
/usr/local/share/gems/gems/railties-4.2.8/lib/rails/railtie.rb:2:in `require'
/usr/local/share/gems/gems/railties-4.2.8/lib/rails/railtie.rb:2:in `<top (required)>'
/usr/local/share/gems/gems/railties-4.2.8/lib/rails/engine.rb:1:in `require'
/usr/local/share/gems/gems/railties-4.2.8/lib/rails/engine.rb:1:in `<top (required)>'
/usr/local/share/gems/gems/railties-4.2.8/lib/rails/application.rb:7:in `require'
/usr/local/share/gems/gems/railties-4.2.8/lib/rails/application.rb:7:in `<top (required)>'
/usr/local/share/gems/gems/railties-4.2.8/lib/rails.rb:11:in `require'
/usr/local/share/gems/gems/railties-4.2.8/lib/rails.rb:11:in `<top (required)>'
/usr/local/share/gems/gems/railties-4.2.8/lib/rails/all.rb:1:in `require'
/usr/local/share/gems/gems/railties-4.2.8/lib/rails/all.rb:1:in `<top (required)>'
/var/www/html/redmine/config/application.rb:3:in `require'
/var/www/html/redmine/config/application.rb:3:in `<top (required)>'
/var/www/html/redmine/Rakefile:5:in `require'
/var/www/html/redmine/Rakefile:5:in `<top (required)>'
/usr/local/share/gems/gems/rake-12.0.0/exe/rake:27:in `<top (required)>'
/usr/local/share/gems/gems/bundler-1.14.5/lib/bundler/cli/exec.rb:74:in `load'
/usr/local/share/gems/gems/bundler-1.14.5/lib/bundler/cli/exec.rb:74:in `kernel_load'
/usr/local/share/gems/gems/bundler-1.14.5/lib/bundler/cli/exec.rb:27:in `run'
/usr/local/share/gems/gems/bundler-1.14.5/lib/bundler/cli.rb:335:in `exec'
/usr/local/share/gems/gems/bundler-1.14.5/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/usr/local/share/gems/gems/bundler-1.14.5/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
/usr/local/share/gems/gems/bundler-1.14.5/lib/bundler/vendor/thor/lib/thor.rb:359:in `dispatch'
/usr/local/share/gems/gems/bundler-1.14.5/lib/bundler/cli.rb:20:in `dispatch'
/usr/local/share/gems/gems/bundler-1.14.5/lib/bundler/vendor/thor/lib/thor/base.rb:440:in `start'
/usr/local/share/gems/gems/bundler-1.14.5/lib/bundler/cli.rb:11:in `start'
/usr/local/share/gems/gems/bundler-1.14.5/exe/bundle:32:in `block in <top (required)>'
/usr/local/share/gems/gems/bundler-1.14.5/lib/bundler/friendly_errors.rb:121:in `with_friendly_errors'
/usr/local/share/gems/gems/bundler-1.14.5/exe/bundle:24:in `<top (required)>'
/usr/local/bin/bundle:22:in `load'
/usr/local/bin/bundle:22:in `<main>'
(See full trace by running task with --trace)

I have to add
gem "json"
before
gem "rails", "4.2.8"
to make it work again.

Ruby since version 1.9.2 ships with a version of the json gem in its standard library. As such, it shouldn't be necessary to explicitly load an external JSON gem just for the functionality (there are other reasons why this still might be a good idea sometimes)

That said, some Ruby packagers (including CentOS), apparently decided to slim down their packaged Rubies to not ship the full standard library. In this case, it might be necessary to install additional packages to get the complete standard library. As such, check with your package manager how to get a complete standard library. If this is not available, you might also chose to open a bug on your Distribution's bug tracking system.

Alternatively, you could also chose to install Ruby using a ruby version manager such as RVM, rbenv, or similar, to install a complete Ruby package independent from your operating system.

This issue should be closed. After upgrading to newer ruby with rvm, the error no longer exists.
Thanks a lot.