spring-boot-3

When to Use

Triggers: When building Spring Boot applications, configuring beans, or implementing REST services.

Load when: building Spring Boot 3.3+ apps, configuring properties, implementing services, or creating REST controllers.

Critical Patterns

Pattern 1: ALWAYS use Constructor Injection

// ✅ Constructor injection — testable, explicit, immutable
@Service
public class UserService {

    private final UserRepository userRepository;
    private final EmailService emailService;
    private final PasswordEncoder passwordEncoder;