【Spring Boot问题】--Singleton bean creation not allowed while singletons of

1、问题描述

Spring Boot工程在启动的过程中没有提示下述错误信息，但是在mvn install的时候提示

Error creating bean with name 'apacheHttpClientFactory’

2018-12-05 14:55:20.967  WARN [-,,,] 36552 --- [ender@4a89722e}] 
s.c.a.AnnotationConfigApplicationContext : Exception encountered during 
context initialization - cancelling refresh attempt: org.springframework
.beans.factory.UnsatisfiedDependencyException: Error creating bean with 
name 'httpClient' defined in org.springframework.cloud.netflix.ribbon.
apache.HttpClientRibbonConfiguration$ApacheHttpClientConfiguration: 
Unsatisfied dependency expressed through method 'httpClient' parameter 0; 
nested exception is org.springframework.beans.factory
.BeanCreationNotAllowedException: Error creating bean with 
name 'apacheHttpClientFactory': 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!)

Error creating bean with name 'eurekaAutoServiceRegistration’

2018-12-05 14:55:22.201  WARN [-,,,] 36552 --- [       Thread-7] s.c.a.AnnotationConfigApplicationContext : Exception thrown 
from ApplicationListener handling ContextClosedEvent

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)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
	at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1087)
	at org.springframework.context.event.ApplicationListenerMethodAdapter.getTargetBean(ApplicationListenerMethodAdapter.java:288)
	at org.springframework.context.event.ApplicationListenerMethodAdapter.doInvoke(ApplicationListenerMethodAdapter.java:258)
	at org.springframework.context.event.ApplicationListenerMethodAdapter.processEvent(ApplicationListenerMethodAdapter.java:180)
	at org.springframework.context.event.ApplicationListenerMethodAdapter.onApplicationEvent(ApplicationListenerMethodAdapter.java:142)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:400)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:406)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:354)
	at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:998)
	at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:965)
	at org.springframework.cloud.context.named.NamedContextFactory.destroy(NamedContextFactory.java:76)
	at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:256)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:571)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:543)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:954)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:504)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:961)
	at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1039)
	at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1015)
	at org.springframework.context.support.AbstractApplicationContext$1.run(AbstractApplicationContext.java:935)

2、问题分析

可能和Spring管理Bean的生命周期有关，具体没有研究，参考网上的资料简单看了看。

3、问题解决

参考https://github.com/dengly/spring-cloud-study/issues/5解决办法，添加了一个FeignBeanFactoryPostProcessor。

/**
 * @Auther: chisj chisj@foxmal.com
 * @Date: 2018-12-05 10:48
 * @Description:
 */
@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));
    }
}

这样只能解决Error creating bean with name 'eurekaAutoServiceRegistration的问题。

在IDEA里面有一个Endpoints–》Beans的功能，找到了feignContext----》eurekaAutoServiceRegistration
顺着这个思路，找到了apacheHttpClientFactory----》traceHttpClientBuilder

于是，再添加一个关于apacheHttpClientFactory的类HttpClientBeanFactoryPostProcessor

/**
 * @Auther: chisj chisj@foxmal.com
 * @Date: 2018-12-05 14:19
 * @Description:
 */
@Component
public class HttpClientBeanFactoryPostProcessor implements BeanFactoryPostProcessor {

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        if (containsBeanDefinition(beanFactory, "apacheHttpClientFactory", "traceHttpClientBuilder")) {
            BeanDefinition bd = beanFactory.getBeanDefinition("apacheHttpClientFactory");
            bd.setDependsOn("traceHttpClientBuilder");
        }

    }

    private boolean containsBeanDefinition(ConfigurableListableBeanFactory beanFactory, String... beans) {
        return Arrays.stream(beans).allMatch(b -> beanFactory.containsBeanDefinition(b));
    }
}

再次打包，没有上述的错误信息了。

4、参考资料

1 【Spring源码–IOC容器的实现】（三）BeanDefinition的载入和解析【I】
2 Spring源码分析——BeanFactory体系之接口详细分析
3 spring源码深度解析(笔记四)–bean的加载
4 org.springframework.beans.factory.BeanCreationNotAllowedException #5
5 BeanCreationNotAllowedException on shutdown for EurekaDiscoveryClientConfiguration