【报错解决】The dependencies of some of the beans in the application context form a cycle：

水深无声 2024-03-23 20:35 12阅读 0赞

## 问题描述 ##

项目启动中报错，错误信息如下：

2022-03-31 17:26:51.877 ERROR 24308 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 
    
    ***************************
    APPLICATION FAILED TO START
    ***************************
    
    Description:
    
    The dependencies of some of the beans in the application context form a cycle:
    
    ┌─────┐
    |  mvcConfigurer (field private org.springframework.boot.autoconfigure.http.HttpMessageConverters com.tmsj.supert.system.config.MvcConfigurer.httpMessageConverters)
    ↑     ↓
    |  messageConverters defined in class path resource [org/springframework/boot/autoconfigure/http/HttpMessageConvertersAutoConfiguration.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.

## 原因分析： ##

**循环依赖报错**

在用springboot启动项目时，报了这个互相依赖的错误，原因就是 Aservice 需要调用 Bservice ，然后Bservice 又需要调用 Aservice ，所以直接依赖循环了。

**循环依赖指的是两个或者多个bean之间相互依赖,形成一个闭环。直接表现为两个service层互相调用对方。**

--------------------

## 解决方案： ##

### 第一种： ###

在 主 Application中 main方法新增，即可解决

SpringApplication springApplication = new SpringApplication(SystemApplication.class);
    		springApplication.setAllowCircularReferences(Boolean.TRUE);
    		springApplication.run(args);

### 第二种 ###

使用@Lazy注解  
解决Spring 循环依赖的一个简单方法就是对一个Bean使用延时加载。也就是说：这个Bean并没有完全的初始化完，实际上他注入的是一个代理，只有当他首次被使用的时候才会被完全的初始化。

@Lazy
        @Autowired
        private BootSerivice bootSerivice;

### **第三****种：** ###

通过修改配置文件来解决

spring:
    	main:
    		allow-circular-references: true

【报错解决】The dependencies of some of the beans in the application context form a cycle：

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