Example of Spring 4.2's @TransactionalEventListener

UserService.java

@Service
@Slf4j
public class UserService {
    private final ApplicationEventPublisher applicationEventPublisher;
    private final UserRepository userRepository;

    UserService(ApplicationEventPublisher applicationEventPublisher,
                UserRepository userRepository) {
        this.applicationEventPublisher = applicationEventPublisher;
        this.userRepository = userRepository;
    }

    @Transactional
    public User registerUser(User user) {
        this.applicationEventPublisher.publishEvent(new UserCreatedEvent(user));
        return this.userRepository.save(user);
    }

    // tl;dr: the event listener is bound to the @Transactional annotation. Assuming the transaction gets to
    // the phase your listener cares about (the default is AFTER_COMMIT), the event listener is called.
    @TransactionalEventListener
    void onUserRegistered(CreationEvent<User> creationEvent) {
        log.debug("New user {} created, generating and sending confirmation email.", creationEvent.getObject().getId());

        System.out.printf("User created: %s\n", creationEvent.getObject());

        log.debug("Email sent to user {}", creationEvent.getObject().getId());
    }
    
    public abstract class CreationEvent<T> {
        private final T object;

        CreationEvent(T object) {
            this.object = object;
        }

        public T getObject() {
            return object;
        }
    }
    
    public class UserCreatedEvent extends CreationEvent<User >{
        public UserCreatedEvent(User user) {
            super(user);
        }
    }
}