我有一个用java（springboot）编写的restapi，我的请求从请求头获取一个json字符串（不要问为什么这样：），例如，{flowerid:123}在我的控制器中，我将字符串Map到对象。因此，当用户传入垃圾数据时，例如{flowerid:}，就会抛出jsonmappingexception。我想在异常处理程序中处理异常，但无法在处理程序中捕获它。我错过什么了吗？谢谢
请参阅下面的代码。

@RestController
    public class FlowerController  {
       @GetMapping
        @ResponseStatus(HttpStatus.OK)
        public GetFlowerResponse getFlowers(@RequestHeader(name = Constants.myHeader) String flowerIdString) throws IOException {
            GetFlowerRequest getFlowerRequest = new ObjectMapper().readValue(flowerIdString, GetFlowerRequest.class);
            //get Flower info with request ...
        }
    }

    @RestControllerAdvice
    public class ApplicationExceptionHandler {
        @ExceptionHandler(value = {JsonMappingException.class})
        @ResponseStatus(HttpStatus.BAD_REQUEST)
        public GetFlowerResponse processServletRequestBindingException(HttpServletRequest req, ServletRequestBindingException e) {
            return buildExceptionResponse(e, ErrorMessages.INVALID_REQUEST.getCode(), e.getMessage());
        }

        @ExceptionHandler(value = Exception.class)
        @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
        public GetFlowerResponse processUnhandledExceptions(HttpServletRequest req, Exception e) {
            return buildExceptionResponse(e, ErrorMessages.SERVICE_UNAVAILABLE.getCode(), ErrorMessages.SERVICE_UNAVAILABLE.getDescription());
        }
    }   

    public class GetFlowerRequest {
        int flowerId;
    }

public class GetFlowerResponse {
    private List<ReturnDetail> returnDetails;
}

@JsonInclude(JsonInclude.Include.NON_NULL)
public class ReturnDetail {
    @Builder.Default
    private Integer code = 0;

    @Builder.Default
    private String message = "";

    private String source;