code: public List<FormField> retrieveFormFields() throws NoResponseException, XMPPErrorException, NotConnectedException,
                      InterruptedException, NotLoggedInException {
          return retrieveFormFields(null);
      }
docs: Get the form fields supported by the server.
  
  @return the list of form fields.
  @throws NoResponseException
  @throws XMPPErrorException
  @throws NotConnectedException
  @throws InterruptedException
  @throws NotLoggedInException