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jbundler Build Status

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 rubygems using the requirements directive of the gem specification. jbundler will include those jar dependencies into its classpath
  • on the first run everything get resolved, any further run just the setup of classpath is done (without any maven involved)
  • it integrates nicely with bundler when Bundler.require is used (like Rails does it)

get started

install JBundler with

jruby -S gem install jbundler

first create a Jarfile, something like

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

together with Bundler

just add it as first entry in your Gemfile

gem 'jbundler'

and now install the bundle both gems and jars

jbundle install

Gemfile only

if there is only a Gemfile and no Jarfile jbundler just handles all the declared jar dependencies of gems. it will only look into gems which bundler loaded.

Gemfile and Jarfile

if there is only a Gemfile and no Jarfile jbundler handles all the declared jar dependencies of gems as well all the jars from the Jarfile. it will only look into gems which bundler loaded.

without Bundler - Jarfile only

requiring jbundler will trigger the classpath setup

require 'jbundler'

this you can use with rubygems or isolate or . . .


more info about the Jarfile and about versions.

for adding a maven repository see Jarfile.


like bundler there is a console which sets up the gems (if there is Gemfile otherwise that part get skipped) and sets up the classloader:

jbundler console

further it adds two methods to the root level:

> jars

to list the loaded jars and

> jar 'org.yaml:snakeyaml'

using the same syntax as use in the Jarfile. there are limitations with such a lazy jar loading but it is very convenient when trying out things.

lazy jar loading

require 'jbundler/lazy'
include JBundler::Lazy

will offer the same jar/jars method than you have inside the console.


please first build the jar file for the jbundler gem, see Build.

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


update of single artifacts is not possible.

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)

Jarfile is not a DSL but it could use a ruby DSL to read the data (any contribution welcome).

jbundler does not yet obey the $HOME/.m2/settings.xml from maven where you usually declare proxies, mirrors, etc.


update of a single artifact is not possible (yet). but to update the whole set of artifacts just delete the lockfile Jarfile.lock

if jbundler sees that Gemfile.lock or Jarfile is newer then the .jbundler/classpath.rb file then jbundler tries to gracefully upgrade towards the changes.


bug-reports and pull request are most welcome.

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