問題描述

啟動微服務專案的時候, 報一下例外

org.springframework.beans.factory.BeanCreationNotAllowedException: Error creating bean with name 'eurekaAutoServiceRegistration': Singleton bean creation not allowed while singletons of this factory are in destruction (Do not request a bean from a BeanFactory in a destroy method implementation!)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:208) [spring-beans-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315) ~[spring-beans-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1109) [spring-context-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.context.event.ApplicationListenerMethodAdapter.getTargetBean(ApplicationListenerMethodAdapter.java:289) ~[spring-context-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.context.event.ApplicationListenerMethodAdapter.doInvoke(ApplicationListenerMethodAdapter.java:259) ~[spring-context-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.context.event.ApplicationListenerMethodAdapter.processEvent(ApplicationListenerMethodAdapter.java:180) ~[spring-context-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.context.event.ApplicationListenerMethodAdapter.onApplicationEvent(ApplicationListenerMethodAdapter.java:142) ~[spring-context-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:404) [spring-context-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:410) [spring-context-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:358) [spring-context-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1013) [spring-context-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:979) [spring-context-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.cloud.context.named.NamedContextFactory.destroy(NamedContextFactory.java:76) [spring-cloud-context-2.0.0.RELEASE.jar:2.0.0.RELEASE]
	at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:256) [spring-beans-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:571) [spring-beans-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:543) [spring-beans-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:957) [spring-beans-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:504) [spring-beans-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:964) [spring-beans-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1061) [spring-context-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1030) [spring-context-5.0.13.RELEASE.jar:5.0.13.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext$1.run(AbstractApplicationContext.java:949) [spring-context-5.0.13.RELEASE.jar:5.0.13.RELEASE]

原因

根本原因是關閉 ApplicationContext 時, 它將銷毀所有單例 bean, eurekaAutoServiceRegistration 首先銷毀, 然后銷毀feignContext. 銷毀 feignContext 時, 它將關閉與每個 FeignClient 關聯的 ApplicationContext. 由于eurekaAutoServiceRegistration 監聽 ContextClosedEvent, 因此這些事件將發送到該bean. 不幸的是, 由于它已被銷毀, 因此我們得到了上述例外(嘗試在銷毀中創建 bean )

解決方案

解決方法一

查看 pom 檔案里有無 spring-boot-starter-web 依賴, 沒有的話添加進來然后重啟服務器

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

解決方法二

@Component
  public class FeignBeanFactoryPostProcessor implements BeanFactoryPostProcessor {
  
      @Override
      public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
          if (containsBeanDefinition(beanFactory, "feignContext", "eurekaAutoServiceRegistration")) {
              BeanDefinition bd = beanFactory.getBeanDefinition("feignContext");
              bd.setDependsOn("eurekaAutoServiceRegistration");
          }
     }
 
     private boolean containsBeanDefinition(ConfigurableListableBeanFactory beanFactory, String... beans) {
         return Arrays.stream(beans).allMatch(b -> beanFactory.containsBeanDefinition(b));
     }
 }