バッキングオブジェクトなしで @RequestBody を使用して複数の変数を Spring MVC コントローラーに渡すことはできますか?

@RequestMapping(value = "/Test", method = RequestMethod.POST)
@ResponseBody
public boolean getTest(@RequestBody String str1, @RequestBody String str2) {}

{
    "str1": "test one",
    "str2": "two test"
}

@RequestMapping(value = "/Test", method = RequestMethod.POST)
@ResponseBody
public boolean getTest(@RequestBody Holder holder) {}

{
    "holder": {
        "str1": "test one",
        "str2": "two test"
    }
}

@RequestMapping(value = "/Test", method = RequestMethod.POST)
@ResponseBody
public boolean getTest(@RequestBody Map<String, String> json) {
   //json.get("str1") == "test one"
}

public boolean getTest(@RequestBody ObjectNode json) {
   //json.get("str1").asText() == "test one"
}