How to use custom validation with @RequestParam in Spring Boot

I have a problem to detect custom validation in Spring Boot example. I defined some validation including in color validator, text length validator and image size validator. When I try to send a request with non validation values, it passed successfully instead of throwing an error. How can I fix it? I also shared my repo shown below Here is the Controller shown below ``` @Validated public class QrController { @PostMapping(consumes = MediaType.MULTIPART_FORM_DATA_VALUE, produces = MediaType.IMAGE_PNG_VALUE) public ResponseEntity<byte[]> createQrCode(@RequestParam String text, @RequestParam String size, @RequestParam String color, @RequestParam String backgroundColor, @RequestParam(required = false) MultipartFile imageFile) throws IOException { CreateQrRequest request = CreateQrRequest.builder() .text(text) .backgroundColor(backgroundColor) .color(color) .size(size) .build(); .... } } ``` Here is the CreateQrRequest shown below ``` @Data @Builder public class CreateQrRequest { @NotBlank @TextLength private String text; @NotBlank @ImageSize private String size; @NotBlank @Color private String color; @NotBlank @Color private String backgroundColor; } ``` Here is the repo : https://github.com/Rapter1990/qr-generator-example