org.springframework.beans.factory.BeanCreationNotAllowedException: Error creating bean with name 'eu

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本文探讨了在使用JUnit对SpringCloud微服务（包含Feign、Eureka）进行测试时遇到的Eureka服务下线错误，并提供了一个通过自定义BeanFactoryPostProcessor来调整bean销毁顺序的解决方案。

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在用JUnit对Spring Cloud（用到了Feign、Eureka）的微服务进行测试的时候，虽然测试方法都通过了，但是会出现下面的错误，这个是因为用JUnit测试的时候，它会模拟真实环境，把自己当前的服务注册到Eureka, 等测试完毕后，会下线自己的服务，而这个错误就是在下线的过程中出现了问题，应该是bean 被销毁的顺序有问题。

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:216) [spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308) ~[spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1080) [spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.context.event.ApplicationListenerMethodAdapter.getTargetBean(ApplicationListenerMethodAdapter.java:283) ~[spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.context.event.ApplicationListenerMethodAdapter.doInvoke(ApplicationListenerMethodAdapter.java:253) ~[spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.context.event.ApplicationListenerMethodAdapter.processEvent(ApplicationListenerMethodAdapter.java:177) ~[spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.context.event.ApplicationListenerMethodAdapter.onApplicationEvent(ApplicationListenerMethodAdapter.java:140) ~[spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:393) [spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:399) [spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:347) [spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:991) [spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:958) [spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.cloud.context.named.NamedContextFactory.destroy(NamedContextFactory.java:76) [spring-cloud-context-1.3.5.RELEASE.jar:1.3.5.RELEASE]
	at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:272) [spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:583) [spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:555) [spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:959) [spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:516) [spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:966) [spring-beans-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1032) [spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1008) [spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext$2.run(AbstractApplicationContext.java:929) [spring-context-4.3.19.RELEASE.jar:4.3.19.RELEASE]

下面是参考其他帖子得到的解决方案：

import java.util.Arrays;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.stereotype.Component;

@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));
    }
}

下面是参考的帖子里分析的原因：

When ApplicationContext shutdown, it will destroy all disposable beans (and beans depend on them). In this case:

FeignContext implements DisposableBean interface
InetUtils implements AutoCloseable interface
EurekaServiceRegistry has a public close method
So they are all considered as disposable beans. Since EurekaAutoServiceRegistration depends on InetUtils and EurekaServiceRegistry beans, so if either bean is destroyed, EurekaAutoServiceRegistration will be destroyed.

Destroy follow First In, Last Out order. Usually application code will not depends on InetUtils or EurekaServiceRegistry, but they depends on FeignClient interfaces. That means FeignContext usually get instituted before InetUtils and EurekaServiceRegistry, so it will be destroyed after them:

InetUtils or EurekaServiceRegistry to be destroyed.
Destroy EurekaAutoServiceRegistration first.
Destroy InetUtils and EurekaServiceRegistry.
Destroy FeignContext which will shutdown all ApplicationContext
associated with FeignClients.
EurekaAutoServiceRegistration listen on ContextClosedEvent but it has
been destroyed. ApplicationContext will try to create it again, got
exception.

参考：

https://github.com/spring-cloud/spring-cloud-netflix/issues/1952

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