How does @Transactional work in Spring Boot? स्प्रिंग बूट में @Transactional कैसे काम करता है?

@Transactional demarcates a method or class as running inside a database transaction. Spring wraps the annotated method in a proxy that begins a transaction before the method runs and commits it after, or rolls it back if a RuntimeException (unchecked exception) is thrown.

Checked exceptions do not trigger a rollback by default unless explicitly configured with rollbackFor. Because it relies on a dynamic proxy, @Transactional has no effect on self-invoked calls within the same class (calling another @Transactional method via this), since the call bypasses the proxy entirely.

@Service
public class OrderService {
    @Transactional(rollbackFor = Exception.class)
    public void placeOrder(Order order) {
        orderRepository.save(order);
        inventoryService.reduceStock(order);
    }
}