Spring Boot2.6.0新特性之默认禁止循环引用

Spring Boot2.6.0为我们带来很多好用的新特性/改进,这篇文章主要给大家介绍了关于Spring Boot2.6.0新特性之默认禁止循环引用的相关资料,文中通过实例代码介绍的非常详细,需要的朋友可以参考下

前言

如下代码，ComponentA类注入ComponentB类，ComponentB类注入ComponentA类，就会发生循环依赖的问题，在2.6.0之前，spring会自动处理循环依赖的问题

import org.springframework.stereotype.Service; import javax.annotation.Resource; @Service public class ComponentA { @Resource private ComponentB componentB; }

import org.springframework.stereotype.Service; import javax.annotation.Resource; @Service public class ComponentB { @Resource private ComponentA componentA; }

现在，2.6.0 这个版本已经默认禁止 Bean 之间的循环引用，如果存在循环引用就会启动失败报错：

***************************
APPLICATION FAILED TO START
***************************
Description:
The dependencies of some of the beans in the application context form a cycle:
┌─────┐
| componentA
↑ ↓
| componentB
└─────┘

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.

处理方案一：

整改业务，清理掉所有存在循环引用的 Bean

处理方案二：

spring: main: allow-circular-references: true

处理方案三：

import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class SpringDemoApplication { public static void main(String[] args) { SpringApplication application = new SpringApplication(SpringDemoApplication.class); application.setAllowCircularReferences(Boolean.TRUE); application.run(args); } }