Victors-MacBook-Air:logstash-zeromq victorng$ irb
jruby-1.6.4 :001 > x = 'json'
 => "json"
jruby-1.6.4 :002 > require x
 => true
jruby-1.6.4 :003 > cls = Class.by_name('JSON')
NoMethodError: undefined method `by_name' for Class:Class
	from (irb):3:in `evaluate'
	from org/jruby/RubyKernel.java:1093:in `eval'
	from org/jruby/RubyKernel.java:1419:in `loop'
	from org/jruby/RubyKernel.java:1205:in `catch'
	from org/jruby/RubyKernel.java:1205:in `catch'
	from /Users/victorng/.rvm/rubies/jruby-1.6.4/bin/irb:17:in `(root)'
jruby-1.6.4 :004 > JSON
 => JSON
jruby-1.6.4 :005 >