jruby/bundler conflict

bouncy-castle-java.rb

# install the latest version of bouncy-castle

$ gem install bouncy-castle-java -v=1.5.0146.1

# create a Gemfile depending on the previous version

source :rubygems
gem "bouncy-castle-java", "1.5.0145.2"

# install the dependencies

$ bundle install

# create a test.rb file containing:

require "bundler"
Bundler.require

# run the file

$ ruby test.rb

# and you get this:

/Users/rubiii/.rvm/gems/jruby-1.5.6@rails3/gems/bundler-1.0.10/lib/bundler/runtime.rb:31:in `setup': You have already activated bouncy-castle-java 1.5.0146.1, but your Gemfile requires bouncy-castle-java 1.5.0145.2. Consider using bundle exec. (Gem::LoadError)