POST @RequestParam Map<String, String> in Spring MVC returns empty map

Question

I have the following method:

@Controller
public class InterfaceController extends MasterController
{
    @PostMapping(value = "/interface") 
    @ResponseBody
    public String incomingPost(@RequestParam Map<String, String> queryMap)
    {
        System.out.println("Map: " + new Gson().toJson(queryMap));
        return "Raw string to return.";
    }
}

When I make a POST request to /interface, I get a successful 200 response with the dummy string I want to return with but the Map is not populated with my parameters:

Map: {}

Why?

how r u calling this endpoint can u show the url

pvpkiran
– pvpkiran

2018-01-17 18:22:46 +00:00
Commented Jan 17, 2018 at 18:22 — pvpkiran
– pvpkiran, Commented Jan 17, 2018 at 18:22

Mahesh · Accepted Answer · 2018-01-17 19:12:40Z

1

@RequestParam works if you pass all your params as part of url.

If you are passing the data in request body, then you must use

@RequestBody Map<String, Object> queryMap

answered Jan 17, 2018 at 19:12

Mahesh

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1 Comment

Gábor DANI Over a year ago

Yes, this was the problem. I was posting in the body instead of x-www-form-urlencoded.

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