Installing Gems with 1.9 compatibility on Windows - Cucumber gem fails

I installed JRuby 1.6.5 on my windows 7 box, and then proceeded to
install some gems:

jruby --1.9 -S gem install bundler rake

I noticed that all the gems are installed under the 1.8 instead of 1.9
directory in:

[JRuby Home]\lib\ruby\gems\1.8

Is this correct? My Gemfile contains ‘cucumber’ gem, so I run the

jruby --1.9 -S bundler install

and then

jruby --1.9 -S bundler exec cucumber

The error message returns indicating that it couldn’t find the
‘cucumber’ executable.
Any help would be appreciated.