@SuppressWarnings("unchecked")
private void handleFacebookRegistration(HttpServletRequest req, HttpServletResponse resp) throws IOException {
Logger logger = Logger.getLogger(RegisterFacebookPlayerServlet.class.getName());
logger.fine("decoding signed_request and getting registration details");
String input = (String)req.getParameter("signed_request").toString();
Map<String, Object> jsonMap = new HashMap<String, Object>();