SpringCloud之Spring循环依赖问题

问题：springcloud在启动springboot微服务时出现循环依赖加载的问题，主要是因为类的创建顺序问题导致，允许的情况是子包类引用父包类时，不允许的情况是类与类同包下调用。

D:\softTool\Java\jdk1.8.0_281\bin\java.exe -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always "-javaagent:D:\softTool\JetBrains\IntelliJ IDEA2021.1.1\lib\idea_rt.jar=56975:D:\softTool\JetBrains\IntelliJ IDEA2021.1.1\bin" -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true -Dfile.encoding=UTF-8 -classpath 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cn.itcast.order.OrderApplication

. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.3.9.RELEASE)

06-19 17:08:01:083 INFO 24808 --- [ main] cn.itcast.order.OrderApplication : No active profile set, falling back to default profiles: default
06-19 17:08:01:638 INFO 24808 --- [ main] o.s.cloud.context.scope.GenericScope : BeanFactory id=cce186b6-cde0-313d-8faf-268f72e2162e
06-19 17:08:01:801 INFO 24808 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'spring.cloud.sentinel-com.alibaba.cloud.sentinel.SentinelProperties' of type [com.alibaba.cloud.sentinel.SentinelProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
06-19 17:08:01:801 INFO 24808 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'com.alibaba.cloud.sentinel.custom.SentinelAutoConfiguration' of type [com.alibaba.cloud.sentinel.custom.SentinelAutoConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
06-19 17:08:01:998 INFO 24808 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8088 (http)
06-19 17:08:02:005 INFO 24808 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
06-19 17:08:02:005 INFO 24808 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.43]
06-19 17:08:02:128 INFO 24808 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
06-19 17:08:02:128 INFO 24808 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1021 ms
06-19 17:08:03:136 WARN 24808 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'orderService': Unsatisfied dependency expressed through field 'userClient'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'cn.itcast.feign.clients.UserClient': Requested bean is currently in creation: Is there an unresolvable circular reference?
06-19 17:08:03:141 INFO 24808 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
06-19 17:08:03:148 INFO 24808 --- [ main] ConditionEvaluationReportLoggingListener :

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
06-19 17:08:03:161 ERROR 24808 --- [ main] o.s.boot.SpringApplication : Application run failed

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'orderService': Unsatisfied dependency expressed through field 'userClient'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'cn.itcast.feign.clients.UserClient': Requested bean is currently in creation: Is there an unresolvable circular reference?
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1425) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:897) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879) ~[spring-context-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) ~[spring-context-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.9.RELEASE.jar:2.3.9.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) [spring-boot-2.3.9.RELEASE.jar:2.3.9.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) [spring-boot-2.3.9.RELEASE.jar:2.3.9.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:405) [spring-boot-2.3.9.RELEASE.jar:2.3.9.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.3.9.RELEASE.jar:2.3.9.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) [spring-boot-2.3.9.RELEASE.jar:2.3.9.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.3.9.RELEASE.jar:2.3.9.RELEASE]
at cn.itcast.order.OrderApplication.main(OrderApplication.java:21) [classes/:na]
Caused by: org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'cn.itcast.feign.clients.UserClient': Requested bean is currently in creation: Is there an unresolvable circular reference?
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.beforeSingletonCreation(DefaultSingletonBeanRegistry.java:355) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:227) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1109) ~[spring-context-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at com.alibaba.cloud.sentinel.feign.SentinelFeign$Builder$1.create(SentinelFeign.java:84) ~[spring-cloud-starter-alibaba-sentinel-2.2.5.RELEASE.jar:2.2.5.RELEASE]
at feign.ReflectiveFeign.newInstance(ReflectiveFeign.java:64) ~[feign-core-10.10.1.jar:na]
at feign.Feign$Builder.target(Feign.java:269) ~[feign-core-10.10.1.jar:na]
at org.springframework.cloud.openfeign.HystrixTargeter.target(HystrixTargeter.java:38) ~[spring-cloud-openfeign-core-2.2.7.RELEASE.jar:2.2.7.RELEASE]
at org.springframework.cloud.openfeign.FeignClientFactoryBean.loadBalance(FeignClientFactoryBean.java:338) ~[spring-cloud-openfeign-core-2.2.7.RELEASE.jar:2.2.7.RELEASE]
at org.springframework.cloud.openfeign.FeignClientFactoryBean.getTarget(FeignClientFactoryBean.java:369) ~[spring-cloud-openfeign-core-2.2.7.RELEASE.jar:2.2.7.RELEASE]
at org.springframework.cloud.openfeign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:347) ~[spring-cloud-openfeign-core-2.2.7.RELEASE.jar:2.2.7.RELEASE]
at org.springframework.cloud.openfeign.FeignClientsRegistrar.lambda$registerFeignClient$0(FeignClientsRegistrar.java:240) ~[spring-cloud-openfeign-core-2.2.7.RELEASE.jar:2.2.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainFromSupplier(AbstractAutowireCapableBeanFactory.java:1235) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1307) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1227) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657) ~[spring-beans-5.2.13.RELEASE.jar:5.2.13.RELEASE]
... 21 common frames omitted

Process finished with exit code 1

解决方案和问题分析：

比如：微服务server1的it.qucc.ca.UserClient.java和it.qucc.ca.UserClientFallbackFactory.java（或者it.qucc.cb.UserClientFallbackFactory.java也行），其中UserClientFallbackFactory创建被声明bean时会使用到UserClient，假设微服务server2的某个类要注入微服务server1的UserClient.java这个bean就会发生循环依赖问题。

因为UserClientFallbackFactory使用到了UserClient，代码如下：

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class UserClientFallbackFactory implements FallbackFactory<UserClient> {

    @Override
    public UserClient create(Throwable throwable) {
        return new UserClient() {
            @Override
            public User findById(Long id) {
                log.error("查询用户异常", throwable);
                return new User();
            }
        };
    }
}

而UserClient.java又在其接口上配置了bean的注解使用到了UserClientFallbackFactory.class，代码如下：

package cn.itcast.feign.clients;


import cn.itcast.feign.fallback.UserClientFallbackFactory;
import cn.itcast.feign.pojo.User;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;

@FeignClient(value = "userservice", fallbackFactory = UserClientFallbackFactory.class)
public interface UserClient {
    @GetMapping("/user/{id}")
    User findById(@PathVariable("id") Long id);
}

因此这个时候如果微服务server2使用的是@Autowired的方式注入第三方的bean(微服务server1的bean)那就会报循环依赖问题。

方法1：解决办法是在微服务server2的启动类上加上第三方的bean所在的包路径进行扫包：

@ComponentScan("cn.qucc.ca")或者

@ComponentScan("cn.qucc")

方法2：分析微服务中注入的bean引用到的类，将被依赖的类放到注入bean的所在类的子包下，比如上述情况的

it.qucc.ca.UserClient.java和it.qucc.ca.UserClientFallbackFactory.java，改成：it.qucc.ca.UserClient.java和it.qucc.ca.cb.UserClientFallbackFactory.java

解决问题其他来源：

(29条消息) SpringCloud学习笔记(一) Spring循环依赖问题_springcloud的循环依赖_嗯mua.的博客-CSDN博客

Sentinel整合Feign出现循环依赖问题

「已解决」Sentinel整合Feign出现循环依赖问题 (baidu.com)

posted @ 2023-06-19 17:33 xycccode 阅读(501) 评论(0) 编辑收藏举报

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