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springcloud-config客户端启用服务发现报错找不到bean EurekaHttpClient

news 来源：原创 2024/9/21 20:37:39

背景

在对已有项目进行改造的时候，集成SpringConfigStarter，编写完bootstrap.yml，在idea 启动项中编辑并新增VM options -Dspring.cloud.config.discovery.enabled=true，该版本不加spring不会从configService获取信息，官方建议引入一个starter，但是在我的项目中并没有用处，点击运行，报错信息如下

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.netflix.discovery.shared.transport.EurekaHttpClient' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1717) ~[spring-beans-5.2.15.RELEASE.jar:5.2.15.RELEASE]at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1273) ~[spring-beans-5.2.15.RELEASE.jar:5.2.15.RELEASE]at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1227) ~[spring-beans-5.2.15.RELEASE.jar:5.2.15.RELEASE]at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:886) ~[spring-beans-5.2.15.RELEASE.jar:5.2.15.RELEASE]at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:790) ~[spring-beans-5.2.15.RELEASE.jar:5.2.15.RELEASE]... 30 common frames omitted

根据堆栈信息缺失EurekaHttpClient，很容易联想到是不是依赖问题，确认了pom.xml之后发现确实引入了

       <dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-eureka-client</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-config</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-bus-amqp</artifactId></dependency>

环境如下
SpringBoot 版本2.3.12.Release
SpringCloud 版本 Hoxton.SR12
JDK 11

再次运行依然报错，然后根据报错堆栈找到，创建的beans
org.springframework.cloud.netflix.eureka.config.EurekaConfigServerBootstrapConfiguration#eurekaConfigServerInstanceProvider该bean的第一个参数就是EurekaHttpClient，也就是创建该bean的时候EurekaHttpClient并没有完成初始化，同时注意到该Configuration的是有初始化EurekaHttpClient的逻辑的

@Bean@ConditionalOnMissingBean(value = {EurekaClientConfig.class},search = SearchStrategy.CURRENT)public EurekaClientConfigBean eurekaClientConfigBean() {return new EurekaClientConfigBean();}@Bean@ConditionalOnMissingBean({EurekaHttpClient.class})@ConditionalOnProperty(prefix = "eureka.client",name = {"webclient.enabled"},matchIfMissing = true,havingValue = "false")public RestTemplateEurekaHttpClient configDiscoveryRestTemplateEurekaHttpClient(EurekaClientConfigBean config, Environment env) {return (RestTemplateEurekaHttpClient)(new RestTemplateTransportClientFactory()).newClient(new DefaultEndpoint(getEurekaUrl(config, env)));}...@Beanpublic ConfigServerInstanceProvider.Function eurekaConfigServerInstanceProvider(EurekaHttpClient client, EurekaClientConfig config) {return (serviceId) -> {if (log.isDebugEnabled()) {log.debug("eurekaConfigServerInstanceProvider finding instances for " + serviceId);}EurekaHttpResponse<Applications> response = client.getApplications(new String[]{config.getRegion()});List<ServiceInstance> instances = new ArrayList();if (this.isSuccessful(response) && response.getEntity() != null) {Applications applications = (Applications)response.getEntity();applications.shuffleInstances(config.shouldFilterOnlyUpInstances());List<InstanceInfo> infos = applications.getInstancesByVirtualHostName(serviceId);Iterator var8 = infos.iterator();while(var8.hasNext()) {InstanceInfo info = (InstanceInfo)var8.next();instances.add(new EurekaServiceInstance(info));}if (log.isDebugEnabled()) {log.debug("eurekaConfigServerInstanceProvider found " + infos.size() + " instance(s) for " + serviceId + ", " + instances);}return instances;} else {return instances;}};}

可以看到bean RestTemplateEurekaHttpClient 通过org.springframework.cloud.netflix.eureka.config.EurekaConfigServerBootstrapConfiguration#configDiscoveryRestTemplateEurekaHttpClient 方法进行初始化，但是该方法执行有两个条件，即eureka.client.webclient.enabled=false和@ConditionalOnMissingBean({EurekaHttpClient.class})当前环境不存在EurekaHttpClient，可以确定的是我在bootstrap.yml 配置了 eureka.client.webclient.enabled=false 并检查了好几次，根据Spring容器的初始化规则按照同Configuration类 bean从上往下一次初始化的原则，容器并没有执行 RestTemplateEurekaHttpClient的初始化操作。E:/.m2/repository/org/springframework/cloud/spring-cloud-netflix-eureka-client/2.2.9.RELEASE/spring-cloud-netflix-eureka-client-2.2.9.RELEASE.jar!/org/springframework/cloud/netflix/eureka/config/EurekaConfigServerBootstrapConfiguration.class:66
在代码的这里断点端上，然后找一个可以拿到ApplicationContext的地方执行一下表达式
environment.getProperty("eureka.client.webclient.enabled") result为 true，为了避免EurekaHttpClient已存在导致的不执行，这里再验证一下是否存在这个bean

在这里插入图片描述
从结果来看，引起RestTemplateEurekaHttpClient初始化不执行的原因就是 eureka.client.webclient.enabled=false，然后再次返回检查了所有配置文件终于再bootstrap
.yml中的dev profile部分看到配置依然显示为true

spring:profiles:include:- defaultactive: dev
---
spring:profiles: defaultcloud:config:enabled: truediscovery:enabled: trueservice-id: YOUR_CONFIG-SERVICEprofile: ${spring.profiles.active}label: masterapplication:name: yourAppName
logging:file:path: ${spring.application.name}/logs/level:root: debug
eureka:instance:prefer-ip-address: true
---
spring:profiles: devsecurity:user:name: userpassword: 123456
eureka:client:webclient:enabled: truefetch-registry: trueservice-url:defaultZone: http://your_eureka_host/eurekainstance:metadata-map:user:name: ${spring.security.user.name}password: ${spring.security.user.password}