Java Asynchronous Thread Test Code

private List<String> historyLogging(History history){
    List<String> errors = new ArrayList<String>();
    new Thread(new Runnable() {
        public void run() {
            try {
                controllerService.history_deleteUserRole(history);
            } catch (SQLException | DatabaseException e) {
                errors.add(e.getMessage());
                e.printStackTrace();
            }
        }
    }).start();
    return errors;
}