Spring Boot Best Practices

Priority: P0

Implementation Guidelines

Dependency Injection (DI)

• Constructor Injection: ALWAYS use constructor injection (via @RequiredArgsConstructor) for immutability.
• Final Fields: Mark all dependencies as final.
• Avoid @Autowired: Do not use field injection. It hides dependencies.

Configuration

• Type-Safe Config: Use @ConfigurationProperties with Records instead of @Value.
• Validation: Combine with @Validated and Jakarta constraints (@NotNull) to fail fast.
• Externalization: Follow strict precedence (Env vars > Config files).

Observability & Logging