/tmp/jars_deps % gem list -a jar-dependencies

*** LOCAL GEMS ***

jar-dependencies (default: 0.3.9)

/tmp/jars_deps % bundle install --path=vendor
Fetching gem metadata from https://rubygems.org/.......
Fetching version metadata from https://rubygems.org/.
Resolving dependencies...
Using bundler 1.15.3
Fetching jar-dependencies 0.3.11
Installing jar-dependencies 0.3.11
Bundle complete! 1 Gemfile dependency, 2 gems now installed.
Bundled gems are installed into ./vendor.
Post-install message from jar-dependencies:

if you want to use the executable lock_jars then install ruby-maven gem before using lock_jars 

   $ gem install ruby-maven -v '~> 3.3.11'

or add it as a development dependency to your Gemfile

   gem 'ruby-maven', '~> 3.3.11'

/tmp/jars_deps % bundle exec rspec
bundler: failed to load command: rspec (/Users/joaoduarte/.rvm/gems/jruby-9.1.10.0/bin/rspec)
Gem::LoadError: You have already activated jar-dependencies 0.3.9, but your Gemfile requires jar-dependencies 0.3.11. Since jar-dependencies is a default gem, you can either remove your dependency on it or try updating to a newer version of bundler that supports jar-dependencies as a default gem.
  /Users/joaoduarte/.rvm/gems/jruby-9.1.10.0/gems/bundler-1.15.3/lib/bundler/runtime.rb:317:in `check_for_activated_spec!'
  /Users/joaoduarte/.rvm/gems/jruby-9.1.10.0/gems/bundler-1.15.3/lib/bundler/runtime.rb:32:in `block in setup'
  org/jruby/RubyArray.java:1734:in `each'
  org/jruby/RubyEnumerable.java:830:in `map'
  /Users/joaoduarte/.rvm/gems/jruby-9.1.10.0/gems/bundler-1.15.3/lib/bundler/runtime.rb:27:in `setup'
  /Users/joaoduarte/.rvm/gems/jruby-9.1.10.0/gems/bundler-1.15.3/lib/bundler.rb:101:in `setup'
  /Users/joaoduarte/.rvm/gems/jruby-9.1.10.0/gems/bundler-1.15.3/lib/bundler/setup.rb:9:in `<main>'
  org/jruby/RubyKernel.java:961:in `require'
  /Users/joaoduarte/.rvm/rubies/jruby-9.1.10.0/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:54:in `require'