* Add transactional-outbox module
Introduce a new transactional-outbox Maven module demonstrating the Transactional Outbox pattern. Adds a Spring Boot sample app and README explaining the pattern. New code includes Order and OutboxEvent entities, OrderStatus/EventStatus enums, Spring Data repositories (OrderRepository, OutboxRepository), OrderService (atomic write of order + outbox), OutboxPublisher (scheduled poll & publish), MessageBroker interface and MessageConsumer implementation, and App entrypoint. Includes unit tests (AppTest, OrderServiceTest, OutboxPublisherTest). Root pom.xml updated to register the new module. Module uses Spring Data JPA, Spring Web, Lombok, H2 and standard test dependencies.
* Add OutboxPublisher edge-case tests
Add two unit tests for OutboxPublisher: one verifies processOutboxEvents returns an empty list when there are no pending events; the other simulates a MessageBroker exception to ensure the event status is set to FAILED and the repository.save is called. Added necessary Mockito and assertion imports to support the tests.
* Use MockitoExtension for OutboxPublisher test
Replace the legacy inline/mock-based test with a JUnit5 + MockitoExtension unit test. Adds OutboxPublisherUnitTest (uses @ExtendWith(MockitoExtension.class), @Mock and @InjectMocks) that verifies broker exceptions mark events as FAILED and that the repository.save(...) is called. Removes the duplicate inline-mocking test and unused Mockito imports from OutboxPublisherTest.
* Replace Lombok @Slf4j with explicit Logger
Remove Lombok's @Slf4j and add explicit org.slf4j.Logger/LoggerFactory fields in transactional-outbox classes.
This makes logging explicit and removes reliance on Lombok's @Slf4j annotation.
* Add scheduled wrapper for outbox publishing
Introduce publishOutboxEvents() annotated with @Scheduled(fixedDelay = 5000) that delegates to the existing processOutboxEvents(). This separates the scheduling concern from the transactional processing method; processOutboxEvents() remains @Transactional and now only handles fetching and dispatching pending OutboxEvent items.
* Use UTC timestamps and add OutboxPublisher ctor
Use UTC for timestamps in OrderService and OutboxPublisher by switching LocalDateTime.now() to LocalDateTime.now(ZoneOffset.UTC). Replace Lombok @RequiredArgsConstructor on OutboxPublisher with an explicit constructor for dependency injection and remove the @Transactional annotation from processOutboxEvents. Update processedAt assignment to use UTC as well.
