#fixed code
                                @PostMapping("refund")
    public Object refund(@LoginAdmin Integer adminId, @RequestBody String body) {
        if (adminId == null) {
            return ResponseUtil.unlogin();
        }
        Integer orderId = JacksonUtil.parseInteger(body, "orderId");
        String refundMoney = JacksonUtil.parseString(body, "refundMoney");
        if (orderId == null) {
            return ResponseUtil.badArgument();
        }

        LitemallOrder order = orderService.findById(orderId);
        if (order == null) {
            return ResponseUtil.badArgument();
        }

        if (order.getActualPrice().compareTo(new BigDecimal(refundMoney)) != 0) {
            return ResponseUtil.badArgumentValue();
        }

        // 如果订单不是退款状态，则不能退款
        if (!order.getOrderStatus().equals(OrderUtil.STATUS_REFUND)) {
            return ResponseUtil.fail(403, "订单不能确认收货");
        }

        // 开启事务管理
        DefaultTransactionDefinition def = new DefaultTransactionDefinition();
        def.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);
        TransactionStatus status = txManager.getTransaction(def);
        try {
            // 设置订单取消状态
            order.setOrderStatus(OrderUtil.STATUS_REFUND_CONFIRM);
            orderService.update(order);

            // 商品货品数量增加
            List<LitemallOrderGoods> orderGoodsList = orderGoodsService.queryByOid(orderId);
            for (LitemallOrderGoods orderGoods : orderGoodsList) {
                Integer productId = orderGoods.getProductId();
                LitemallProduct product = productService.findById(productId);
                Integer number = product.getNumber() + orderGoods.getNumber();
                product.setNumber(number);
                productService.updateById(product);
            }
        } catch (Exception ex) {
            txManager.rollback(status);
            logger.error("系统内部错误", ex);
            return ResponseUtil.fail(403, "订单退款失败");
        }

        //TODO 发送邮件和短信通知，这里采用异步发送
        // 退款成功通知用户
        /**
         *
         * 您申请的订单退款 [ 单号:{1} ] 已成功，请耐心等待到账。
         * 注意订单号只发后6位
         *
         */
        litemallNotifyService.notifySMSTemplate(order.getMobile(), ConfigUtil.NotifyType.REFUND, new String[]{order.getOrderSn().substring(8, 14)});


        txManager.commit(status);

        return ResponseUtil.ok();
    }
#vulnerable code 
                                @PostMapping("refund")
    public Object refund(@LoginAdmin Integer adminId, @RequestBody String body) {
        if (adminId == null) {
            return ResponseUtil.unlogin();
        }
        Integer orderId = JacksonUtil.parseInteger(body, "orderId");
        Integer refundMoney = JacksonUtil.parseInteger(body, "refundMoney");
        if (orderId == null) {
            return ResponseUtil.badArgument();
        }

        LitemallOrder order = orderService.findById(orderId);
        if (order == null) {
            return ResponseUtil.badArgument();
        }

        if(order.getActualPrice().compareTo(new BigDecimal(refundMoney)) != 0){
            return ResponseUtil.badArgumentValue();
        }

        // 如果订单不是退款状态，则不能退款
        if (!order.getOrderStatus().equals(OrderUtil.STATUS_REFUND)) {
            return ResponseUtil.fail(403, "订单不能确认收货");
        }

        // 开启事务管理
        DefaultTransactionDefinition def = new DefaultTransactionDefinition();
        def.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);
        TransactionStatus status = txManager.getTransaction(def);
        try {
            // 设置订单取消状态
            order.setOrderStatus(OrderUtil.STATUS_REFUND_CONFIRM);
            orderService.update(order);

            // 商品货品数量增加
            List<LitemallOrderGoods> orderGoodsList = orderGoodsService.queryByOid(orderId);
            for (LitemallOrderGoods orderGoods : orderGoodsList) {
                Integer productId = orderGoods.getProductId();
                LitemallProduct product = productService.findById(productId);
                Integer number = product.getNumber() + orderGoods.getNumber();
                product.setNumber(number);
                productService.updateById(product);
            }
        } catch (Exception ex) {
            txManager.rollback(status);
            logger.error("系统内部错误", ex);
            return ResponseUtil.fail(403, "订单退款失败");
        }
        txManager.commit(status);

        return ResponseUtil.ok();
    } 
                            #location 17 
                            #vulnerability type NULL_DEREFERENCE