ThreadPoolExecutor service = (ThreadPoolExecutor) Executors.newFixedThreadPool(1);

    while (service.getActiveCount()>0) {
                try {
                    Thread.sleep(millis);
                    logger.info("waiting for the end of save thread ");
                } catch (InterruptedException e) {
                    logger.error(e.getMessage());
                }
            }

     Runnable task = new Runnable() {
                @Override
                public void run() {
                    try {
                        saver.save(list);
                    } catch (DaoException e) {
                        throw new RuntimeException(e);
                    }
                }
            };

           try{
                service.execute(task);
            } catch (Exception e) {
                throw  new ServiceException(e);
            }