Spring Boot2.6.0新特性之默认禁止循环引用
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);
}
}
总结
上一篇：Spring Bean生命周期之BeanDefinition的合并过程详解
栏 目：JAVA代码
本文标题：Spring Boot2.6.0新特性之默认禁止循环引用
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