Отправка JSON на сервер и добавление в БД

Клиент (Java). Выполняется jar на компьютере

static void addToBd(String name, String year, String quality, String genre, String duration, String ozvuchka, String country, String cast, String producer, String description, String download, String art, String screenshots){
    try
    {
        String jsonResponse;
        URL url = new URL("http://<некий адрес>/<некий скрипт>.php?");
        HttpURLConnection con = (HttpURLConnection)url.openConnection();
        con.setUseCaches(false);
        con.setDoOutput(true);
        con.setDoInput(true);
        con.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
        con.setRequestMethod("POST");
        JSONObject film = new JSONObject();
        film.put("name", name);
        film.put("year", year);
        film.put("quality", quality);
        film.put("genre", genre);
        film.put("duration", duration);
        film.put("ozvuchka", ozvuchka);
        film.put("country", country);
        film.put("cast", cast);
        film.put("producer", producer);
        film.put("description", description);
        film.put("download", download);
        film.put("art", art);
        film.put("screenshots", screenshots);
        String strJsonBody = "json="+film.toString();
        System.out.println("strJsonBody: " + strJsonBody);
        byte[] sendBytes = strJsonBody.getBytes("UTF-8");
        con.setFixedLengthStreamingMode(sendBytes.length);
        OutputStream outputStream = con.getOutputStream();
        outputStream.write(sendBytes);
        int httpResponse = con.getResponseCode();
        System.out.println("httpResponse: " + httpResponse);
        if (httpResponse >= HttpURLConnection.HTTP_OK
            && httpResponse < HttpURLConnection.HTTP_BAD_REQUEST)
        {
            Scanner scanner = new Scanner(con.getInputStream(), "UTF-8");
            jsonResponse = scanner.useDelimiter("\\A").hasNext() ? scanner.next() : "";
            scanner.close();
        }
        else
        {
            Scanner scanner = new Scanner(con.getErrorStream(), "UTF-8");
            jsonResponse = scanner.useDelimiter("\\A").hasNext() ? scanner.next() : "";
            scanner.close();
        }
        System.out.println("Response: " + jsonResponse);
    }
    catch (Throwable t)
    {
        t.printStackTrace();
    }
    finally
    {
        return;
    }
}

Сервер

<?php
 $servername = ":)";
 $username = ":)";
 $password = ":)"; 
 $conn = new mysqli($servername, $username, $password);
 $conn -> query("USE admin_filmsanwap");
 $conn->set_charset("utf8");
 if ($conn->connect_error){
die("Connection failed: " . $conn->connect_error);
}
$data = $_POST['json'];
$result = json_decode($data);
$name = $result->name;
    $year = $result->year;
    $quality = $result->quality;
    $genre = $result->genre;
    $duration = $result->duration;
    $ozvuchka = $result->ozvuchka;
    $country = $result->country;
    $cast = $result->cast;
    $producer = $result->producer;
    $description = $result->description;
    $download = $result->download;
    $art = $result->art;
    $screenshots = $result->screenshots;
$insert = "INSERT INTO `admin_filmsanwap`.`films` (`name`,`year`,`quality`,`genre`,`duration`,`ozvuchka`,`country`,`cast`,`producer`,`description`,`download`,`art`,`screenshots`) VALUES ('$name', '$year', '$quality', '$genre', '$duration', '$ozvuchka', '$country', '$cast', '$producer', '$description', '$download', '$art', '$screenshots');";
if(mysqli_query($conn, $insert)){
    echo 'success';
    } 
else {
if ($conn->connect_error){
 die("Connection failed: " . $conn->connect_error);
  } 
  }
  ?>

Ответ от сервера

strJsonBody: json={"name":"t","year":"t","quality":"t","genre":"t","duration":"t","ozvuchka":"t","country":"t","cast":"t","producer":"t","description":"t","download":"t","art":"t","screenshots":"t"}
httpResponse: 200
Response: success

Почему в БД добавляется запись с пустыми колонками? Где ошибка? Будет ли работать UTF-8?