spring-framework-patterns

Spring Boot REST API architecture should enforce proper layering by separating controllers, services, and repositories, using DTOs to isolate domain entities, and defining clear @Transactional boundaries at the service layer to maintain clean application structure.

Constructor injection in Spring is preferred over field injection because it enforces immutable dependencies, ensures beans are fully initialized before use, simplifies unit testing without reflection, and makes dependency requirements explicit in your codebase architecture.

Global exception handling in a Spring Framework application centralizes error responses across REST controllers, ensuring consistent API error payloads, preventing raw stack traces from leaking, and simplifying controller logic by separating cross-cutting error management.

Spring Data JPA transactions should be managed by defining @Transactional boundaries at the service layer, keeping repositories focused on data access, and utilizing specifications for complex queries to ensure scalable and maintainable database interactions.

These Spring patterns are specifically designed for code reviews and security configurations, providing architectural guidance to enforce best practices across Java Spring projects, ensuring secure, maintainable, and scalable enterprise application development.