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I have a Spring Boot/Webflux project and would like to set a validation error if a username already exists, with a friendly message. However, if I make a non-blocking call to the database in the validate(Object target, Errors errors) method then it's not clear what to do with the returned Mono. The only workaround I found was to use the non-reactive database driver to check for existence, which at least doesn't require calling block() directly. Any other suggestions?

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  • can you provide code samples, your question is not clear ! Commented Aug 21, 2022 at 13:49
  • I guess I'm just looking for a Reactive version of Spring's org.springframework.validation.Validator interface Commented Sep 12, 2022 at 16:14
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