How to validate url parameters bundle in parameter object in Spring's @RestController

Question

I have a standard @RestController method. I introduced a parameter-object (MyMapQuery) in order to avoid large number of method arguments:

@RestController
public class MyController {
  @RequestMapping(value = "/api/search")
  @ResponseBody
  public SearchResponse search(MyMapQuery query) {
    [...]
  }

MyMapQuery is a standard java bean with setters and getters, so when I pass multiple url parameters http://.../api/search?west=1&east=2&north=20&south=0, they are correctly filled in.

How do I implement required validation on some of the url parameters?

Spring automatically responds with 400(bad request), when parameters are mapped like below, but does no validation in case of MyMapQuery.

public SearchResponse search(@RequestParam BigDecimal east, @RequestParam BigDecimal west, ...) {

Answer 1

Just use

 public SearchResponse search(@Valid MyMapQuery query) {

and add the necessary bean-validation annotations to the fields of MyMapQuery.