public class User {
private String username;
private String password;
}
public class UserService {
public void registerUser(User user) {
Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
Set<ConstraintViolation<User>> violations = validator.validate(user);
if (!violations.isEmpty()) {
for (ConstraintViolation<User> violation : violations) {
System.out.println(violation.getPropertyPath() + ": " + violation.getMessage());
}
} else {
// ...
}
}
}
