Spring RestController JSON

RestController
@Secured("hasRole('ADMIN')")
@RequestMapping(value = "/api/v1")
public class ApiController {

    @Autowired
    private PageService pageService;

    @Autowired
    private ImageService imageService;

    @Autowired
    private ConfigService configService;

    @Autowired
    private CategoryService categoryService;

    @Autowired
    private UploadFileService uploadFileService;

    private static final Logger LOGGER = LogManager.getLogger(ApiController.class);

    @PostMapping(value = "/categories/load", produces = MediaType.APPLICATION_JSON_VALUE)
    private Response categoriesLoad(Response response) {
        response.setSuccess("OK");
        response.addData("categories", categoryService.getAll());
        return response;
    }

    @PostMapping(value = "/category/add", consumes = MediaType.MULTIPART_FORM_DATA_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
    private Response categoryAdd(Response response, CategoryAddForm categoryFormAdd) {
        categoryService.add(response, categoryFormAdd);
        return response;
    }

    @PostMapping(value = "/category/info", consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
    private Response categoryInfo(Response response, @RequestParam("categoryId") Integer categoryId) {
        categoryService.info(response, categoryId);
        return response;
    }

    @PostMapping(value = "/category/save", consumes = MediaType.MULTIPART_FORM_DATA_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
    private Response categorySave(Response response, CategorySaveForm categorySaveForm) {
        categoryService.save(response, categorySaveForm);
        return response;
    }

    @PostMapping(value = "/category/remove", consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
    private Response categoryRemove(Response response, @RequestParam("categoryId") Integer categoryId) {
        categoryService.remove(response, categoryId);
        return response;
    }

    @PostMapping(value = "/category/load", consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
    private Response categoryLoad(Response response, CategoryLoadForm categoryLoad) {
        categoryService.load(response, categoryLoad);
        return response;
    }

    @PostMapping(value = "/image/add", consumes = MediaType.MULTIPART_FORM_DATA_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
    private Response imageAdd(Response response, ImageAddForm imageAddForm) {
        imageService.add(response, imageAddForm);
        return response;
    }

    @PostMapping(value = "/page/add", consumes = MediaType.MULTIPART_FORM_DATA_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
    private Response pageAdd(Response response, PageAddForm pageAddForm) {
        pageService.add(response, pageAddForm);
        return response;
    }

    @PostMapping(value = "/upload/image", consumes = MediaType.MULTIPART_FORM_DATA_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
    private Response uploadImage(Response response, @RequestParam("file") MultipartFile file, HttpServletRequest request) {
        uploadFileService.upload(response, file);
        return response;
    }

}