each example likes in its own branch :)
- maven_multi_module_with_rails: simple rails application using a jar from another maven module
- webapp_with_nokogiri_using_maven: a gem, a jar and a webapp using both. setting up the webapp so there is only one version of each jar present.
- webapp_with_nokogiri_without_maven: a gem, a jar and a webapp using both. showing the setup leads to two versions of a jar (xercesImpl).