The repository contains two subprojects: rest and rest-client.
rest contains a running REST application with Spring's @RestController, a service, and some manually written DTOs. Running the main method will start the application.
rest-client contains the same manually written DTOs and a REST client written as a @Component. Running the main method will execute some exemplary requests against the running application. Note that in an application the AdderRestClient should be used via @Autowired.