Validação de CPF em Java com Spring Boot: anotação customizada e cliente HTTP resiliente

Implementing CPF validation in Java Spring Boot is best achieved via Jakarta Validation within DTOs to ensure standardized 400 errors. This approach integrates resilient HTTP clients with timeouts for external queries. In React, creating a CPF field requires managing state with digits only and deriving masks during rendering. This method prevents common bugs related to pasting, cursor positioning, and mobile keyboard inputs, ensuring a seamless user experience without relying on external masking libraries for the frontend.