编写测试代码：

    @Test
    public void callBack() throws InterruptedException {
        ExecutorService executorService = Executors.newFixedThreadPool(100);
        for (int i = 0; i < 100; i++) {
            executorService.execute(new Runnable() {
                @Override
                public void run() {
                    try {
                        payBack();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            });
        }
    }


    public void payBack()  {
        String tradeNo = "202259607180675101";
        //log.info("--------"+tradeNo+"--------");
        //通过tradeNo查询订单状态。交易单号
        ProductOrderDO productOrderDO = productOrderService.queryProductOrderState(tradeNo);
        if(productOrderDO == null) {
            log.error("--------fail--------------------"); ;
        }
        log.info("--------"+tradeNo+"--------");
        String orderState = productOrderDO.getState();
        //sleep(1000l);
        log.info("--------"+orderState+"--------");
    }

发现SQL根本没有执行，出现报错

 [“SqlSession[xxx] was not registered for synchronization because synchronization is not active

原因是Sqlsession未注册同步，同步注册未激活，JDBC connection不能被Spring所托管，，，callBack方法加事务注解@Transactional就可以了