I have a following controllerClass, which takes a request and process it. It works fine with below code.

@RestController
@RequestMapping("/user/id")
public class UserController {

  private final UserName userName;

  @Autowired
  public UserController(final UserName userName) {
    this.userName = Objects.requireNonNull(userName, "Not found");
  }

  @JsonRequestMapping(method = POST)
  public ResponseEntity<UserResponse> validate(
      @RequestBody UserRequest UserRequest,
      @RequestHeader(required = false) String validation) {

…
  }

However, I want to add a validation to check request size, to avoid extra-large malicious requests being made, and reject the request if size exceeds a particular value.

I tried:

import javax.validation.constraints.Size;
…
@RequestBody(@Size(max = 200)) UserRequest UserRequest

But this is giving me Cannot find method 'value', which I am not sure why. Is this the right way to achieve the validation that i want, if yes what am i missing with above?