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Why do I get a “warning: already initialized constant JSON :: VERSION” when starting a grabber cucumber?

I just installed a Linux Mint box for developing rails using rvm. I went ahead and created a Rails 5 application, set up a mysql connection, added cucumber rails , and then tried to run:

rake cucumber

For some reason I was met:

 /usr/bin/ruby2.3 -S bundle exec cucumber --profile default /usr/lib/ruby/vendor_ruby/json/version.rb:3: warning: already initialized constant JSON::VERSION /var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/version.rb:3: warning: previous definition of VERSION was here /usr/lib/ruby/vendor_ruby/json/version.rb:4: warning: already initialized constant JSON::VERSION_ARRAY /var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/version.rb:4: warning: previous definition of VERSION_ARRAY was here /usr/lib/ruby/vendor_ruby/json/version.rb:5: warning: already initialized constant JSON::VERSION_MAJOR /var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/version.rb:5: warning: previous definition of VERSION_MAJOR was here /usr/lib/ruby/vendor_ruby/json/version.rb:6: warning: already initialized constant JSON::VERSION_MINOR /var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/version.rb:6: warning: previous definition of VERSION_MINOR was here /usr/lib/ruby/vendor_ruby/json/version.rb:7: warning: already initialized constant JSON::VERSION_BUILD /var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/version.rb:7: warning: previous definition of VERSION_BUILD was here /usr/lib/ruby/vendor_ruby/json/common.rb:99: warning: already initialized constant JSON::NaN /var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/common.rb:99: warning: previous definition of NaN was here /usr/lib/ruby/vendor_ruby/json/common.rb:101: warning: already initialized constant JSON::Infinity /var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/common.rb:101: warning: previous definition of Infinity was here /usr/lib/ruby/vendor_ruby/json/common.rb:103: warning: already initialized constant JSON::MinusInfinity /var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/common.rb:103: warning: previous definition of MinusInfinity was here /usr/lib/ruby/vendor_ruby/json/common.rb:128: warning: already initialized constant JSON::UnparserError /var/lib/gems/2.3.0/gems/json-1.8.5/lib/json/common.rb:128: warning: previous definition of UnparserError was here

This is, as far as I know, a fairly simple installation of vanilla, so I can’t understand what I did to earn these warnings. Do I have any conflicting gems? If so, how do I solve this?

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2 answers

I managed to get rid of JSON warnings:

 bundle clean --force bundle
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The json gem that came with your version of Ruby is a bit outdated. If you want to get rid of these warnings, you must include the latest version in your Gemfile:

gem 'json', '>= 2.0.0'

Then run bundle install .

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Source: https://habr.com/ru/post/1014080/

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