Grokking Spring Boot
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Rollback Rules

public class PaymentUnavailableException extends Exception {
    public PaymentUnavailableException(String message) {
        super(message);
    }
}

The payment client throws this exception when the provider at payments.example.com does not answer. It extends Exception, not RuntimeException, so it is a checked exception. The compiler makes every caller either catch it or declare it with throws. BookingService.book declares it, and book carries @Transactional.

We made the provider fail this way during Ben's request for seat A12. The caller caught the exception as expected

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