$ gem env
RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.24
  - RUBY VERSION: 1.8.7 (2012-05-01 patchlevel 357) [java]
  - INSTALLATION DIRECTORY: /usr/local/rvm/gems/jruby-1.6.7.2@myapp
  - RUBY EXECUTABLE: /opt/deploy/torquebox/torquebox-current/jruby/bin/jruby
  - EXECUTABLE DIRECTORY: /usr/local/rvm/gems/jruby-1.6.7.2@myapp/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - universal-java-1.6
  - GEM PATHS:
     - /usr/local/rvm/gems/jruby-1.6.7.2@myapp
     - /usr/local/rvm/gems/jruby-1.6.7.2@global
  - 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/

$ gem list | grep inline
inline_attachment (0.4.0)

$ gem list | grep rails
rails (2.3.5)

$ irb
jruby-1.6.7.2 :001 > require 'inline_attachment'
LoadError: no such file to load -- inline_attachment

$ /usr/local/rvm/bin/irb-jruby-1.6.7.2@myapp
jruby-1.6.7.2 :001 > require 'rubygems'
 => true
jruby-1.6.7.2 :002 > require 'inline_attachment'
LoadError: no such file to load -- inline_attachment

$ /usr/local/rvm/bin/irb-jruby-1.6.7.2@myapp
jruby-1.6.7.2 :001 > require 'inline_attachment'
LoadError: no such file to load -- inline_attachment