Caused by: java.lang.ClassNotFoundException: com.netflix.config.DeploymentContext$ContextKey
我实在完成cloud2020.0.0的断路器聚合监控Turbine和hystrix是报错，不要一上来就想着换版本，多试试说不定就ok了，曾经有个问题搞了我两天，我就是不换版本，最后终于赵到问题所在了。
错误信息：
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2021-05-16 14:42:42.721 ERROR 3632 --- [ main] o.s.boot.SpringApplication : Application run failed org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.cloud.netflix.archaius.ArchaiusAutoConfiguration': Unsatisfied dependency expressed through field 'externalConfigurations'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'configurableEnvironmentConfiguration' defined in class path resource [org/springframework/cloud/netflix/archaius/ArchaiusAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.cloud.netflix.archaius.ConfigurableEnvironmentConfiguration]: Factory method 'configurableEnvironmentConfiguration' threw exception; nested exception is java.lang.NoClassDefFoundError: com/netflix/config/DeploymentContext$ContextKey at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1425) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:897) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:755) ~[spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:402) ~[spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:312) ~[spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1247) ~[spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1236) ~[spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE] at cn.itcast.TurbinAppliation.main(TurbinAppliation.java:15) ~[classes/:na] Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'configurableEnvironmentConfiguration' defined in class path resource [org/springframework/cloud/netflix/archaius/ArchaiusAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.cloud.netflix.archaius.ConfigurableEnvironmentConfiguration]: Factory method 'configurableEnvironmentConfiguration' threw exception; nested exception is java.lang.NoClassDefFoundError: com/netflix/config/DeploymentContext$ContextKey at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:657) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:637) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1341) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1181) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:556) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.addCandidateEntry(DefaultListableBeanFactory.java:1525) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1489) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveMultipleBeans(DefaultListableBeanFactory.java:1378) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1265) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1227) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] ... 21 common frames omitted Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.cloud.netflix.archaius.ConfigurableEnvironmentConfiguration]: Factory method 'configurableEnvironmentConfiguration' threw exception; nested exception is java.lang.NoClassDefFoundError: com/netflix/config/DeploymentContext$ContextKey at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:652) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] ... 37 common frames omitted Caused by: java.lang.NoClassDefFoundError: com/netflix/config/DeploymentContext$ContextKey at org.springframework.cloud.netflix.archaius.ArchaiusAutoConfiguration.configureArchaius(ArchaiusAutoConfiguration.java:125) ~[spring-cloud-netflix-archaius-2.2.6.RELEASE.jar:2.2.6.RELEASE] at org.springframework.cloud.netflix.archaius.ArchaiusAutoConfiguration.configurableEnvironmentConfiguration(ArchaiusAutoConfiguration.java:112) ~[spring-cloud-netflix-archaius-2.2.6.RELEASE.jar:2.2.6.RELEASE] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na] at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na] at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na] at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na] at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.2.14.RELEASE.jar:5.2.14.RELEASE] ... 38 common frames omitted Caused by: java.lang.ClassNotFoundException: com.netflix.config.DeploymentContext$ContextKey at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581) ~[na:na] at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) ~[na:na] at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[na:na] ... 45 common frames omitted
像这种错误信息，我们要学会观看，在错误开始和casue语句多处都出现了com.netflix.config.DeploymentContext$ContextKey。说明我们缺少这个依赖，或者更新这个依赖
我这里添加一个依赖
com.netflix.archaius archaius-core 0.7.1
然后就OK了
