关于SpringBoot中出现的循环依赖问题-Toy模板网

这篇具有很好参考价值的文章主要介绍了关于SpringBoot中出现的循环依赖问题。希望对大家有所帮助。如果存在错误或未考虑完全的地方，请大家不吝赐教，您也可以点击"举报违法"按钮提交疑问。

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:文章来源地址https://www.toymoban.com/news/detail-671439.html
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