springboot-best-practices

Rules

1. Project Structure

Layered architecture: controller (REST), service (business logic), repository (data access), model/entity, dto, config, exception.

2. Dependency Injection

Constructor injection preferred. Use @RequiredArgsConstructor with final fields. Avoid field injection with @Autowired.

// GOOD: Constructor injection
@Service
@RequiredArgsConstructor
public class UserService {
    private final UserRepository userRepository;
    private final EmailService emailService;
}