could not autowire field: private com.netflix.discovery.DiscoveryClient 有更新!

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近日在研究翟先生的《Spring Cloud微服务实战》,第三章在讲配置Eureka的时候,遇到了一个小问题。

前言

先上源代码:

Github: eureka-demo

问题重现

  • 启动eureka-demo-server

  • 启动eureka-demo-client

  • 在浏览器中分别打开两个页面:

    http://localhost:1234
    

    	http://localhost:8080
    

    其截图如下:

    euraka

    以及

  • 到这一步,可以看出来,Eureka的服务注册是成功的,但是如果我们做一个改动:

    将eureka.client.controller.IndexController的:

    //    @Autowired
    //    private DiscoveryClient client;
    

这两行注释还原,再运行eureka-demo-client,就会报错:

	Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.netflix.discovery.DiscoveryClient] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1373) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1119) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:545) ~[spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE]
	... 24 common frames omitted
	
大意就是说com.netflix.discovery.DiscoveryClient没有办法注入进去。

当然,书里说的"getLocalServiceInstance"这个方法也是找不到的。

error

解决办法

DiscoveryClient分两种:

  • 一种是com.netflix.discovery.DiscoveryClient下的,它不是一个有效的Spring Bean类型

  • 另一种是org.springframework.cloud.client.discovery.DiscoveryClient下的…

所以解决办法很简单了,换一个包下的DiscoveryClient就可以了

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