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bundler support for jars for jruby
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manage jar dependencies similar than bundler manages gem dependencies.

  • the DSL mimics the one from bundler
  • you can use maven like version declaration or rubygems/bundler like version ranges
  • it locks down the jar versions inside "Jarfile.lock"
  • you can declare jar dependency within a gem using the requirements directive of the gem specification. jbundler will include those jar dependencies into its classpath

the difference to bundler

  • it is just a development gem - no need for it during runtime. just add Jars.require_jars_lock! to your code and for older JRuby add gem 'jar-dependencies', '~> 0.1.11' as runtime dependency.
  • you need to run bundle install first if any of the gems has jar dependencies.
  • all one command jbundle, see jbundle --help on the possible options and how to update a single jar, etc.

get started

install JBundler with

jruby -S gem install jbundler

first create a Jarfile, something like

jar 'org.yaml:snakeyaml', '1.14'
jar 'org.slf4j:slf4j-simple', '>1.1'


more info about the Jarfile and about versions.

for adding a maven repository see Jarfile.

Building the jbundler gem

running the integration test

./mvnw verify

building the gem (see ./pkg)

./mvnw package -Dinvoker.skip

or just

gem build jbundler.gemspec


src/example/my_project has a Gemfile which uses a gem which depends on jar dependency. see src/example/gem_with_jar/gem_with_jar.gemspec how the jar gets declared.

execute src/example/my_project/info.rb to see it in action:

  cd src/example/my_project
  jbundle install
  bundle exec info.rb


since the version resolution happens in two steps - first the gems then the jars/poms - it is possible in case of a failure that there is a valid gems/jars version resolution which satisfies all version contraints. so there is plenty of space for improvements (like maven could resolve the gems as well, etc)

special thanks

the whole project actually started with a controversial discussion on a pull request on bundler. this very same pull request were the starting point of that project here. probably by now there is no much left of the original code but many thanks to ANithian for given the seed of that project.


Almost all code is under the MIT license but the java class ([] which was derived from EPL licensed code.


  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Added some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request


enjoy :)

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