关于SpringBoot中出现的循环依赖问题

• 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!