diagram-happy.sequence

User->Application: GET /greeting/1
Application->GreetingController: greeting(1)
GreetingController->GreetingService: greeting(1)
GreetingService->GreetingRepository: findById(1)
GreetingRepository-->GreetingService: Optional[Greeting(id=1, ..)]
GreetingService-->GreetingController: Greeting(id=1, ..)
GreetingController-->Application: Greeting(id=1, ..)
Application-->User: 200