About This Architecture

PetClinic demonstrates a classic three-layer architecture combining entity-relationship modeling with controller-service-repository separation of concerns. Controllers (ControladorProprietario, ControladorPet) route HTTP requests to domain services, which orchestrate business logic and call repositories for data persistence. Entities (Proprietario, Pet, Visita) define the relational schema with primary and foreign keys, while repositories abstract database access and enable testability. This layered pattern isolates UI logic from business rules and data access, making the codebase maintainable, testable, and aligned with Spring Framework conventions. Fork this diagram to customize entity relationships, add new controllers, or document your own domain model. The architecture exemplifies how to structure medium-complexity applications that balance simplicity with separation of concerns.

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

PetClinic's layered architecture separates concerns across three tiers: controllers handle HTTP requests, services implement business logic and validation, and repositories manage data persistence. Entities (Proprietario, Pet, Visita) define the relational schema with primary and foreign keys, enabling clean dependency injection and testability.