303-frameworks-spring-boot-validation

You can validate request data in Spring Boot REST APIs by applying Bean Validation annotations to your DTOs at API boundaries, enforcing data integrity before processing payloads and returning centralized error responses.

The best way to validate configuration properties in Spring Boot is applying constraint annotations to @ConfigurationProperties classes, ensuring environment settings meet constraints during startup to fail fast and prevent runtime errors.

Creating custom constraints for Bean Validation in Spring Boot involves defining a custom annotation and implementing a ConstraintValidator interface to enforce specific validation rules beyond standard annotations for complex DTO requirements.

Handling validation errors centrally in a Spring Boot application requires implementing a global exception handler, typically via @ControllerAdvice, to intercept constraint violations and return standardized API error responses to clients.

Yes, you can use constraint groups in Spring Boot to sequence validation rules, allowing you to apply different sets of constraints dynamically depending on the specific API endpoint or processing workflow stage.

Yes, Spring Boot validation supports nested DTOs by annotating nested object fields with @Valid, ensuring that validation cascades down to validate embedded objects within the primary request payload.