Spring MVC #ExceptionHandler does not catch MethodArgumentNotValidException - spring

Question

I wanted to create a registration form where the passed data is observed whether it is valid or not.
Here is my code:
#Controller
public class RegistrationController {
#Autowired
private UserService userService;
#GetMapping("/register")
public String registration(Model model) {
model.addAttribute("user", new RegistrationRequest());
return "register";
}
#PostMapping("/register")
public String register(#Valid #ModelAttribute("user") RegistrationRequest user,
HttpServletResponse response) {
String token = userService.registerUser(user);
response.addHeader("Set-Cookie", token + "; HttpOnly; Secure; SameSite=Lax;");
return "index";
}
#ExceptionHandler(MethodArgumentNotValidException.class)
public String handleIncorrectRequests(MethodArgumentNotValidException ex, Model model) {
String errorFields = ex.getBindingResult()
.getAllErrors().stream()
.map(err -> ((FieldError) err)
.getField())
.distinct()
.collect(Collectors.joining(", "));
String message = String.format("The next fields are incorrectly filled: %s!",
errorFields);
model.addAttribute("error", "Registration failed");
model.addAttribute("cause", message);
return "error";
}
#ExceptionHandler(EmailAlreadyInUseException.class)
public String handleEmailAlreadyInUse(Model model) {
model.addAttribute("error", "Registration failed");
model.addAttribute("cause", "The given email is already being used! Please try with a different one!");
return "error";
}
}
Here is the RegistrationRequest's implementation:
#Data
#ValidateConfirmPassword
public class RegistrationRequest {
#NotBlank
#Size(min = 4 ,max = 100)
private String username;
#NotBlank
private String email;
#NotBlank
#Size(min = 6)
private String password;
#NotBlank
#Size(min = 6)
private String confirmPassword;
}
The additional validator classes:
#Documented
#Constraint(validatedBy = ConfirmPasswordValidator.class)
#Target( { ElementType.TYPE})
#Retention(RetentionPolicy.RUNTIME)
public #interface ValidateConfirmPassword {
String message() default "Confirm password not matches the password!";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
public class ConfirmPasswordValidator implements ConstraintValidator<ValidateConfirmPassword, RegistrationRequest>{
#Override
public boolean isValid(RegistrationRequest value, ConstraintValidatorContext context) {
return value.getPassword().equals(value.getConfirmPassword());
}
}
When the data is valid the system does its job, but when any constraint violation happen I get the following log and bad request screen:
[36m.w.s.m.s.DefaultHandlerExceptionResolver[0;39m [2m:[0;39m Resolved [org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: ... (list of incorrectly filled fields)
I have no clue why the ExceptionHandler does not catch it, while the other one for EmailAlreadyInUseException works properly. Any help would be a blessing.