electrum/platform — comment on commit e8203922b2bb200cd71f89da53be67ac51e4f9f0
File: rack-server-base/pom.xml line 155
By electrum:

It invokes the rake specified in the Gemfile.lock via Bundler using whatever Ruby environment is already setup. It also requires that all the required gems were previously installed via e.g. "bundle install". Yes, this is not a good approach.