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jruby json gem dominates
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| $ jruby --version | |
| jruby 1.7.2.dev (1.9.3p327) 2013-01-18 fffffff on Java HotSpot(TM) 64-Bit Server VM 1.7.0_07-b10 [darwin-x86_64] | |
| $ gem list json | |
| *** LOCAL GEMS *** | |
| json (1.7.7 java) | |
| $ irb | |
| jruby-1.7.2.dev :001 > require 'json' | |
| => true | |
| jruby-1.7.2.dev :002 > JSON::VERSION | |
| => "1.7.5" | |
| jruby-1.7.2.dev :003 > | |
| $ bundle exec rails c | |
| Loading development environment (Rails 3.2.12) | |
| jruby-1.7.2.dev :001 > JSON::VERSION | |
| => "1.7.7" | |
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Behavior appears to be that jruby's json gem takes precedence except when using Rails/bundler.
Note that json is set to 1.7.7 in my Gemfile.lock