• 环境:

　　　　SpringBoot2.7.8

  • 背景:

    • 在增加出库订单时需要对物品表的的数量进行修改

      因此我在OutboundController中创建了几个公共方法,并将其注入到Spring中，结果给我报了这一串错误。

    • Description:
      The dependencies of some of the beans in the application context form a cycle:
      ┌──->──┐
      | getGoodsNumber defined in class path resource [com/QRproject/project/system/controller/GoodsController.class]
      └──<-──┘
      Action:
      Relying upon circular references is discouraged and they are prohibited by default. Update your application to remove the dependency cycle between beans. As a last resort, it may be possible to break the cycle automatically by setting spring.main.allow-circular-references to true.

  • 代码:
    • 在OutboundController中创建了个公共方法,并将其注入到Spring中:（以下方法均未开启事务支持）　
    •  1 @RestController
 2 @RequestMapping("/goods")
 3 public class GoodsController {
 4 
 5     @Autowired
 6     private IGoodsService goodsService;
 7     @Bean
 8     public boolean deleteGoodsNum(Integer goodsId,Integer goodsNum){
 9         Goods goods = goodsService.getById(goodsId);
10         goods.setGoodsNumber(goods.getGoodsNumber()-goodsNum);
11         goodsService.updateById(goods);
12         return true;
13     }
14 }
    • 接着我在OutboundController中注入GoodsController
    •  1 public class OutboundController {
 2     @Autowired
 3     private IOutboundService outboundService;
 4     @Autowired
 5     private GoodsController goodsController;
 6     
 7     @PostMapping
 8     public Result<?> addOutbound(@RequestBody Outbound outbound){
 9         goodsController.deleteGoodsNum(outbound.getGoodsId(),outbound.getGoodsNumber());
10         LocalDateTime localDateTime = LocalDateTime.now();
11         outbound.setOutTime(localDateTime);
12         outboundService.save(outbound);
13         return Result.success("增加出库订单成功");
14     }
15 }
    • 运行完便报错了
  • 解决:

    • 引发的原因是因为两个类进行了相互的调用，触发了spring的循环依赖检查

      SpringBoot中2.6后开启了循环依赖检查，并默认关闭了循环依赖支持 可以在配置中开启

      诚然造成循环依赖是一个bad habit 我们需要另外一种解决方法:

    • 1.试着把goodsServices注入过来结果还是一样
    • 2.使用@Lazy 懒加载注解 还是不行
    • 1 @Lazy
2 @Autowired
3 private GoodsController goodsController;
    • 3.试了一下在配置中开启循环依赖支持结果也不行。。
    • 1 spring:
2     main:
3         allow-circular-references: true
    • 4.最后只好老实敲代码进行解耦了
      • goodsPublicService
      • 1 @Service
2 public interface goodsPublicService extends IService<Goods>{
3     void deleteGoodsNum(Integer goodsId, Integer goodsNumber);
4 }
      • goodsPublicServiceImpl:
      • 1 @Service
2 public class goodsPublicServiceImpl extends ServiceImpl<GoodsMapper, Goods> implements goodsPublicService {
3     public void deleteGoodsNum(Integer goodsId,Integer goodsNum){
4         Goods goods = this.baseMapper.selectById(goodsId);
5         goods.setGoodsNumber(goods.getGoodsNumber()-goodsNum);
6         this.baseMapper.updateById(goods);
7     }
8 }
      • OutboundController：
      • 1 @PostMapping
2 public Result<?> addOutbound(@RequestBody Outbound outbound){
3    goodsPublicService.deleteGoodsNum(outbound.getGoodsId(),outbound.getOutNum());
4    LocalDateTime localDateTime = LocalDateTime.now();
5    outbound.setOutNum(outbound.getOutNum());
6    outbound.setOutTime(localDateTime);
7    outboundService.save(outbound);
8    return Result.success("增加出库订单成功");
9
  • 成功运行!
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文章来源: 博客园

原文链接: https://www.cnblogs.com/CooperCode/p/17657952.html

标签： java java8 java开发
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