How do you publish and listen to a custom application event in Spring? | Interview Question

How do you publish and listen to a custom application event in Spring? | Interview Question | TechyTalkWithDev

Publishing and Listening to a Custom Event

java

@Service
class OrderService {
    private final ApplicationEventPublisher publisher;

    void placeOrder(Order order) {
        orderRepository.save(order);
        publisher.publishEvent(new OrderPlacedEvent(order));
    }
}

@Component
class EmailNotifier {
    @EventListener
    void onOrderPlaced(OrderPlacedEvent event) { sendConfirmationEmail(event.order()); }
}

@EventListener Replaced Implementing ApplicationListener<T> as the Idiomatic Style

Publishing and Listening to a Custom Event