Supporting material (code, schemas etc) for [Unified Log Processing] ulp, authored by Alexander Dean and published by Manning Publications.
Assuming git, [Vagrant] vagrant-install and [VirtualBox] virtualbox-install installed:
host$ git clone https://github.com/alexanderdean/Unified-Log-Processing.git
host$ cd snowplow
host$ vagrant up && vagrant ssh
guest$ cd /vagrant/ch02/2.1/hellocalculator
guest$ gradle test