What is the Cargo Tracker application?

The Cargo Tracker application is a Java EE application that was developed to show some of the capabilities of the Java EE platform. It was built with best practices such as domain-driven design. The application is meant to be easy to understand, while still highlighting the strength of many Java EE technologies. The Cargo Tracker application is used to track and route cargo that’s been booked in the application. It contains functionality to book cargo at a certain port and choose a route for the cargo, and an event viewer to publish events that the system reacts to.

The Cargo Tracker application has multiple versions/branches that use a different version of Java or Jakarta EE. For this book, we are interested in the version of the Cargo Tracker application that uses Java EE 7.

Java EE 7 can be used with both Java 7 and Java 8. However, the developers of the Cargo Tracker application used some language features that are only available...