To start with the exercise do: - Checkout: "git clone -b exercise git://github.com/erikrozendaal/cqrs-lottery.git" - Run "mvn clean install" in the cqrs-lottery directory - Go to the cqrs-example subdirectory - Run "mvn jetty:run" - Go to http://localhost:8080/lottery/lotteries - Create a lottery - Create a customer... this will break. Fix it! - Purchases a ticket... this will break. Fix it!