The dependencies of some of the beans in the application context form a cycle异常分析及解决

拼搏现实的明天。 2023-10-15 22:54 151阅读 0赞

## 项目中出现了循环依赖问题： ##

![在这里插入图片描述][c3302838e9264f2d83e8989849eb0e08.png]

### 1、排查了构造器注入 ###

![在这里插入图片描述][1c1e50bc49c6471bb2460fb1f9086cac.png]  
改成  
![在这里插入图片描述][74008d1fe390442c91a2f37a68790344.png]

### 2、yml中添加了允许循环依赖。 ###

spring:
      main:
          allow-circular-references: true  #允许循环引用

### 3、上面修改完之后还是不行 ###

出现这个问题。  
Requested bean is currently in creation: Is there an unresolvable circular reference?

Error creating bean with name 'ticketInterceptor': Unsatisfied dependency expressed through field 'appService'; 
    nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'appServiceImpl': Unsatisfied dependency expressed through field 'bizSysUserApi'; 
    nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'mvcResourceUrlProvider': Requested bean is currently in creation: Is there an unresolvable circular reference?

找到TicketInterceptor中AppService添加上@Lazy

![在这里插入图片描述][e6b30fd63b084801b104f1a7eec4824a.png]

@Lazy注解注解的作用主要是减少springIOC容器启动的加载时间。  
Spring IoC （ApplicationContext） 容器一般都会在启动的时候实例化所有单实例 bean 。如果我们想要 Spring 在启动的时候延迟加载 bean，即在调用某个 bean 的时候再去初始化，那么就可以使用 @Lazy 注解。当出现循环依赖时，也可以添加@Lazy

[Is there an unresolvable circular reference循环注入问题的解决][Is there an unresolvable circular reference]

[c3302838e9264f2d83e8989849eb0e08.png]: https://img-blog.csdnimg.cn/c3302838e9264f2d83e8989849eb0e08.png
[1c1e50bc49c6471bb2460fb1f9086cac.png]: https://img-blog.csdnimg.cn/1c1e50bc49c6471bb2460fb1f9086cac.png
[74008d1fe390442c91a2f37a68790344.png]: https://img-blog.csdnimg.cn/74008d1fe390442c91a2f37a68790344.png
[e6b30fd63b084801b104f1a7eec4824a.png]: https://img-blog.csdnimg.cn/e6b30fd63b084801b104f1a7eec4824a.png
[Is there an unresolvable circular reference]: https://mp.weixin.qq.com/s?__biz=MzAxMjY5NDU2Ng==&mid=2651865938&idx=1&sn=3676c506f2e4e5c312e8c126cffe1a56&chksm=8049061bb73e8f0d7c4b2f5fa9e0d969a6f1d7e758cf0b69b36246a9176b925450458a949606&scene=27

The dependencies of some of the beans in the application context form a cycle异常分析及解决

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