Software as a service boilerplate project; it was created to try a clean architecture approach as described in the book Get Your Hands Dirty on Clean Architecture by Tom Hombergs. And also to try unit testing with the mockito library.
This project is meant to be used by an adapter project.
An adapter project would be a project with controllers (or job, or message handler) classes that call the services from the application.service packages, data provider classes that implements the interfaces from the application.port.out packages, and configuration classes that wire all together.
For example this could be a Spring project.