$resource POST Error 400

$resource POST Error 400 - angularjs

Hi guys i'm working with angular $resource to make POST call. This is my FE function
$scope.showPrompt = function (ev) {
$scope.usernameSelected = [];
$scope.users.forEach(function (element) {
if (element.checked)
$scope.usernameSelected.push(element);
console.log($scope.usernameSelected);
});
var conferma = $mdDialog.prompt()
.title('Insert group name?')
.clickOutsideToClose(true)
//.textContent('Bowser is a common name.')
.placeholder('Group name')
.ariaLabel('Group name')
.targetEvent(ev)
.ok('Crea gruppo')
.cancel('Annulla');
$mdDialog.show(conferma).then(function (result) {
GroupService.group({}, {
creatore: $cookieStore.get('username'),
gruppo: result,
partecipanti: $scope.usernameSelected},
function (data) {
console.log("GRUPPO", data);
});
$scope.status = 'NOMEGRUPPO: ' + result + '.'; //inserito il nome gruppo
}, function () {
$scope.status = 'INSERT NOME GRUPPO';
});
};
This the GroupService:
var groupService = angular.module("groupService",['ngResource']);
groupService.factory("GroupService",['$resource',
function($resource){
var url = "";
return $resource("",{},{
group: {method : "POST", url:url+"group", isArray: false},
findGroup: {method : "GET", url:url+"findGroup", isArray: true}
});
}]);
I have this error:
angular.js:14328 Possibly unhandled rejection: {"data":"<!DOCTYPE html><html><head><title>Apache Tomcat/8.5.11 - Error report</title><style type=\"text/css\">h1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} h2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} h3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} body {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} b {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} p {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;} a {color:black;} a.name {color:black;} .line {height:1px;background-color:#525D76;border:none;}</style> </head><body><h1>HTTP Status 400 - </h1><div class=\"line\"></div><p><b>type</b> Status report</p><p><b>message</b> <u></u></p><p><b>description</b> <u>The request sent by the client was syntactically incorrect.</u></p><hr class=\"line\"><h3>Apache Tomcat/8.5.11</h3></body></html>","status":400,"config":{"method":"POST","transformRequest":[null],"transformResponse":[null],"jsonpCallbackParam":"callback","url":"group","data":{"creatore":"ciro","gruppo":"nuovo","partecipanti":[{"id":0,"username":"a","email":"a#aa","password":null,"name":"a","surname":"a","longitude":0,"latitude":0,"checked":true},{"id":0,"username":"ciao","email":"ciao#ciao","password":null,"name":"ciao","surname":"ciao","longitude":0,"latitude":0,"checked":true}]},"headers":{"Accept":"application/json, text/plain, */*","Content-Type":"application/json;charset=utf-8"}},"statusText":""}
This is my BE code. I have a spring controller that manage client requests
#RequestMapping(value = "/group", method = RequestMethod.POST)
public #ResponseBody
Group createGroup(#RequestBody Group json, HttpServletRequest request) throws SQLException, ClassNotFoundException {
Group g = DBUtils.insertGroup(json.getPartecipanti(), json.getGruppo(), json.getCreatore());
return g;
}
This is my DBUtils.insertGroup
public static Group insertGroup(List<String> members, String groupName, String userCreator) throws ClassNotFoundException, SQLException {
Class.forName("com.mysql.jdbc.Driver");
Connection conn;
conn = DriverManager.getConnection(DB_URL, USER, PASS);
String sql = "insert into gruppo \n"
+ " (idCreatorUser,groupName,idPartecipante,data) values (?,?,?,?) ";
PreparedStatement pstm = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
java.util.Date date = new Date();
Timestamp timestamp = new Timestamp(date.getTime());
Utente creator = DBUtils.findUser(userCreator);
pstm.setInt(1, creator.getId());
pstm.setString(2, groupName);
pstm.setInt(3, creator.getId());
pstm.setTimestamp(4, timestamp);
int res = pstm.executeUpdate();
ResultSet rsId = pstm.getGeneratedKeys();
rsId.next();
int idGruppo = rsId.getInt(1);
Group response = new Group();
response.setIdGruppo(idGruppo);
response.setGruppo(groupName);
response.setIdCreatore(creator.getId());
response.setData(timestamp);
response.setPartecipanti(members);
response.setCreatore(creator.getUsername());
System.out.println(response);
sql = "insert ignore into gruppo \n"
+ " (idGruppo,idCreatorUser,groupName,idPartecipante,data) values (?,?,?,?,?) ";
pstm = conn.prepareStatement(sql);
Utente part;
for (int i = 0; i < members.size(); i++) {
pstm.setInt(1, idGruppo);
pstm.setInt(2, creator.getId());
pstm.setString(3, groupName);
part = DBUtils.findUser(members.get(i));
pstm.setInt(4, part.getId());
pstm.setTimestamp(5, timestamp);
pstm.executeUpdate();
}
conn.close();
return response;
}
I want to send in body some parameters but I can't to figure out what is the syntact error made.

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I think the problem may be in this line
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Try changing it to
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https://stackoverflow.com/a/2551006/1184056