About This Architecture

Spring PetClinic refactoring diagram shows a three-layer architecture separating domain entities (Owner, Pet, Visit), presentation controllers, proposed service layer, and persistence repositories. Data flows from OwnerController and PetController through service classes (OwnerService, PetService, VisitService) to repositories, which persist to the database via one-to-many relationships. This layered pattern isolates business logic from HTTP handling and database access, improving testability and maintainability. Fork this diagram to customize for your own Spring Boot application or use it as a reference when introducing service layers into legacy monoliths. The proposed refactoring highlights moving validation and query logic out of controllers into dedicated service classes.

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How should I structure a Spring Boot application with controllers, services, and repositories?

The Spring PetClinic diagram demonstrates a three-layer architecture where controllers handle HTTP requests, services encapsulate business logic and validation, and repositories manage database persistence. This separation improves testability, reusability, and maintainability by isolating concerns across presentation, business, and data access layers.