How to troubleshoot SpringBoot data validation not working

If the data validation of Spring Boot is not working properly, you can follow these steps to resolve the issue:

1. Ensure that the necessary dependencies, including spring-boot-starter-validation and hibernate-validator, are included in the Spring Boot project.
2. Make sure to add the @Validated annotation to the class that requires data validation.
3. Make sure to add appropriate validation annotations, such as @NotNull, @Size, @Pattern, on fields that require data validation.
4. Make sure to add the @Valid annotation on the method parameters that require data validation.
5. Ensure that custom validation annotations are correctly imported and used if custom validation annotations are used.
6. If the @Validated annotation is used, make sure that the groups attribute of this annotation is consistent with the groups attribute of the validation annotation.
7. If you need to customize validation error messages, you can define the corresponding error messages in a resource file (such as messages.properties).
8. If it still doesn’t work, you can try adding the @EnableWebMvc annotation to the main class of the Spring Boot application to enable Spring MVC’s default configuration.

If all the above steps have been checked and the data validation is still not working, it may be necessary to further examine the related code logic or review the logs to gather more information to resolve the issue.