Gem installed but not loading - ruby-on-rails

Question

I'm trying to create a database, but I keep getting the following error:
$jruby -S bundle exec rake db:create
[31mCould not find json-1.7.6 in any of the sources
[33mRun 'bundle install' to install missing gem.
I have run bundle install (including jruby -S bundle install). This post is leading me to believe that maybe there's a problem with my environment. But, after looking at my Gem path and Gem environment, I don't think that's the case.
Here is my Gem path:
["c:/jruby-1.7.3/lib/ruby/gems/shared", "c:/Users/Jesse Flores/.gem/jruby/1.9"]
And my Gem Environment
RubyGems Environment:
- RUBYGEMS VERSION: 1.8.24
- RUBY VERSION: 1.9.3 (2013-02-21 patchlevel 385) [java]
- INSTALLATION DIRECTORY: c:/jruby-1.7.3/lib/ruby/gems/shared
- RUBY EXECUTABLE: c:/jruby-1.7.3/bin/jruby.exe
- EXECUTABLE DIRECTORY: c:/jruby-1.7.3/bin
- RUBYGEMS PLATFORMS:
- ruby
- universal-java-1.7
- GEM PATHS:
- c:/jruby-1.7.3/lib/ruby/gems/shared
- c:/Users/Jesse Flores/.gem/jruby/1.9
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :benchmark => false
- :backtrace => false
- :bulk_threshold => 1000
- "install" => "--no-rdoc --no-ri --env-shebang"
- "update" => "--no-rdoc --no-ri --env-shebang"
- REMOTE SOURCES:
- http://rubygems.org/
Also, I can see json-1.7.6 and json-1.7.6-java in my Gemfile.lock file.
Any ideas as to what's going on here?
Thanks!
Oh, I'm using Windows 8.

Answer 1

As occasionally happens, found the right post that helped me solve the problem just a few minutes after posting the question.
Kaleth's answer on this post: Missing gem when running rake got me pointed in the right direction. With jruby, it's actually something like this:
jruby -S bundle install --path=vendor/bundle
After that, rake -T worked properly.