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並前往https://codehunter.cc/a/spring/how-to-perform-an-action-only-if-the-mono-is-empty-and-throw-an-error-if-not-empty

How to perform an action only if the Mono is empty and throw ...

public Mono<User> insertUser(User user) { return userRepository.findByUsername(user.username()) .flatMap(__ -> Mono.error(new ...

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