Spring controller not getting JSON POST data from JS file

[Sujoy Choudhury]

From my JS file I am posting this JSON data.

myPayload[0].id=1&myPayload[0].name=Me&myPayload[0].pId=2&myPayload[0].pName=Dad

YUI Code:

var formElements = YAHOO.util.Connect.setForm("myFormId");
alert("New form elements:" + formElements); // Alerting POST data as shown above

YAHOO.util.Connect.resetFormState();

YAHOO.util.Connect.asyncRequest("POST", "/mycontroller/save", {
    cache : false,
    success : function(res) {
        alert(res.responseText);
    },
    failure : function(res) {
        alert(res.responseText);
    }
}, formElements);

Controller Code:

@RequestMapping(value = "/save", method=RequestMethod.POST)
@ResponseBody
public String saveData(ModelMap mm, @ModelAttribute("myPayload") MyBean bean,  BindingResult errors) {

    log.info("save:Called");
    List<MyDTO> lst = bean.getList();
    log.info("save:Number of records:" + lst.size());

    return "Successfully Updated.";
}

Bean Code:

public class MyBean {

    private List<MyDTO> myPayload = new  AutoPopulatingList<MyDTO>(MyDTO.class);

    public List<MyDTO> getList() {
        return myPayload;
    }

    public void setList(List<MyDTO> mList) {
        this.myPayload = mList;
    }

}

The list is still empty. The bean values are also empty. What is wrong here?