% jruby --version
jruby 1.7.0.RC1 (1.9.3p203) 2012-09-25 8e849de on Java HotSpot(TM) 64-Bit Server VM 1.8.0-ea-b57 +indy [darwin-x86_64]

% jruby --ng-server &
NGServer started on all interfaces, port 2113.

% jruby --ng -e "require 'haml'"

% jruby --ng -e "require 'haml'"
Invalid gemspec in [/usr/local/lib/ruby/gems/1.9.1/specifications/listen-0.5.1.gemspec]: Valid types are [:development, :runtime], 
Invalid gemspec in [/usr/local/lib/ruby/gems/1.9.1/specifications/listen-0.5.2.gemspec]: Valid types are [:development, :runtime], 
Invalid gemspec in [/usr/local/lib/ruby/gems/1.9.1/specifications/log4r-1.1.10.gemspec]: Valid types are [:development, :runtime], 
Invalid gemspec in [/usr/local/lib/ruby/gems/1.9.1/specifications/method_source-0.8.gemspec]: Valid types are [:development, :runtime], 
Invalid gemspec in [/usr/local/lib/ruby/gems/1.9.1/specifications/mime-types-1.19.gemspec]: Valid types are [:development, :runtime], 
Invalid gemspec in [/usr/local/lib/ruby/gems/1.9.1/specifications/minitest-3.5.0.gemspec]: Valid types are [:development, :runtime], 
Invalid gemspec in [/usr/local/lib/ruby/gems/1.9.1/specifications/multi_json-1.3.6.gemspec]: Valid types are [:development, :runtime],
…