calling Spring Rest method with AngularJs

while trying to call web service implemented with spring REST I get tyhe 400 code state http request error. I will expose some code hope find someone that can help me.

My controller method:

@RequestMapping(value = "/addpost", method = RequestMethod.POST)
    public @ResponseBody
    String addpost(@RequestBody WrapperPostUser postuser) {

        PostDto post = postuser.getPost();
        UserDto user = postuser.getUser();
        postservice.addPost(post, user);
        return "post inserted";

The class WrapperPostUser:

public class WrapperPostUser implements Serializable {

    private PostDto post;
    private UserDto user;

//getters and setters }

Finally, calling the method with AngularJs:

$scope.addPost = function() {


        $http({
            method : 'POST',
            url : 'http://localhost:8080/wall/addpost',
            data : ({
                post : $scope.postt,
                user : $scope.userr
            }),

        }).success(function(data, status, headers, config) {
            // $scope.persons.push(data);
            alert("Success");
            $scope.user = "";
            $scope.post = "";
        }).error(function(data, status, headers, config) {
            alert("erreur");
            // called asynchronously if an error occurs
            // or server returns response with an error status.
        });

The Server Response: 400 http : Bad Request 

the tow objects:

$scope.userr = {
        userId : 15,
        firstName :  "foulen",
        lastName: "ben foulen"};

    $scope.postt = {
             idpost : 18,
             datePost : date,
             note : "Mon message"};