Error creating bean with name 'eurekaClient' defined in BeanDefinition defined in class path resourc_error creating bean with name 'eurekainstanceconfi-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_41070393/article/details/86569667

本文详细解析了一起Spring Boot应用在启动时遇到的Eureka Client创建失败的错误，具体表现为找不到默认构造器的问题。通过深入分析错误信息，定位到jar包冲突的原因，并提供了排查和解决此类问题的有效方法。

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直接看报错信息

2019-01-21 10:11:12.976 [ERROR] [main] [SpringApplication:771] : Application startup failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'eurekaClient' defined in BeanDefinition defined in class path resource [org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.cloud.context.scope.GenericScope$LockedScopedProxyFactoryBean]: No default constructor found; nested exception is java.lang.NoSuchMethodException: org.springframework.cloud.context.scope.GenericScope$LockedScopedProxyFactoryBean.<init>()
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1110)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1054)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:512)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
	at org.springframework.beans.factory.support.AbstractBeanFactory.isSingleton(AbstractBeanFactory.java:428)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:424)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:390)
	at org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$PreserveErrorControllerTargetClassPostProcessor.postProcessBeanFactory(ErrorMvcAutoConfiguration.java:334)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:281)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:176)
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:686)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:524)
	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107)
	at com.xxx.api.Application.main(Application.java:31)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.cloud.context.scope.GenericScope$LockedScopedProxyFactoryBean]: No default constructor found; nested exception is java.lang.NoSuchMethodException: org.springframework.cloud.context.scope.GenericScope$LockedScopedProxyFactoryBean.<init>()
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:85)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1102)
	... 22 common frames omitted
Caused by: java.lang.NoSuchMethodException: org.springframework.cloud.context.scope.GenericScope$LockedScopedProxyFactoryBean.<init>()
	at java.lang.Class.getConstructor0(Class.java:3082)
	at java.lang.Class.getDeclaredConstructor(Class.java:2178)
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:80)
	... 23 common frames omitted

GenericScope$LockedScopedProxyFactoryBean：No default constructor found没有默认构造器。。

java.lang.NoSuchMethodException: org.springframework.cloud.context.scope.GenericScope$LockedScopedProxyFactoryBean.

没有这个方法。。。

进行搜索，发现这个类可以找到，同时方法也是可以找到，并且找到2个！！！重点就是2个，很简单，直接show dependencies排除掉多余jar即可。

总结：类似的问题只看报错（方法、构造器），可能无法直接明白的知道是jar冲突了，但是经过简单的分析也可以很快发现问题

补充：如何show dependencies