SpringCloud 服务提供者无法向服务注册中心注册

问题：报错误

Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.core.Version

注意：分析错误堆栈是从最下面往最上面分析，解决问题时也是从下往上修复。比如下面完整的错误

堆栈信息，我们就从最下面的 Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.core.Version   开始处理，在这里只要解决了 jackson 的依赖问题就解决了。

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.

2018-06-24 23:05:17.641 ERROR 9816 --- [           main] o.s.boot.SpringApplication               : Application startup failed

org.springframework.context.ApplicationContextException: Failed to start bean 'org.springframework.cloud.netflix.eureka.EurekaDiscoveryClientConfiguration'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.eurekaClient' defined in class path resource [org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.netflix.discovery.EurekaClient]: Factory method 'eurekaClient' threw exception; nested exception is java.lang.RuntimeException: Failed to initialize DiscoveryClient!

    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:176) ~[spring-context-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:50) ~[spring-context-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:346) ~[spring-context-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:149) ~[spring-context-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:112) ~[spring-context-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:880) ~[spring-context-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:144) ~[spring-boot-1.5.13.RELEASE.jar:1.5.13.RELEASE]

    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) ~[spring-context-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.13.RELEASE.jar:1.5.13.RELEASE]

    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.13.RELEASE.jar:1.5.13.RELEASE]

    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.13.RELEASE.jar:1.5.13.RELEASE]

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.13.RELEASE.jar:1.5.13.RELEASE]

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.13.RELEASE.jar:1.5.13.RELEASE]

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.13.RELEASE.jar:1.5.13.RELEASE]

    at com.example.server1.HellApplication.main(HellApplication.java:11) [classes/:na]

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.eurekaClient' defined in class path resource [org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.netflix.discovery.EurekaClient]: Factory method 'eurekaClient' threw exception; nested exception is java.lang.RuntimeException: Failed to initialize DiscoveryClient!

    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599) ~[spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1181) ~[spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1075) ~[spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.beans.factory.support.AbstractBeanFactory$2.getObject(AbstractBeanFactory.java:351) ~[spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.cloud.context.scope.GenericScope$BeanLifecycleWrapper.getBean(GenericScope.java:359) ~[spring-cloud-context-1.1.1.RELEASE.jar:1.1.1.RELEASE]

    at org.springframework.cloud.context.scope.GenericScope.get(GenericScope.java:176) ~[spring-cloud-context-1.1.1.RELEASE.jar:1.1.1.RELEASE]

    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:346) ~[spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.aop.target.SimpleBeanTargetSource.getTarget(SimpleBeanTargetSource.java:35) ~[spring-aop-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:192) ~[spring-aop-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at com.sun.proxy.$Proxy67.getApplications(Unknown Source) ~[na:na]

    at org.springframework.cloud.netflix.eureka.EurekaDiscoveryClientConfiguration.maybeInitializeClient(EurekaDiscoveryClientConfiguration.java:120) ~[spring-cloud-netflix-eureka-client-1.1.5.RELEASE.jar:1.1.5.RELEASE]

    at org.springframework.cloud.netflix.eureka.EurekaDiscoveryClientConfiguration.start(EurekaDiscoveryClientConfiguration.java:97) ~[spring-cloud-netflix-eureka-client-1.1.5.RELEASE.jar:1.1.5.RELEASE]

    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:173) ~[spring-context-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    ... 14 common frames omitted

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.netflix.discovery.EurekaClient]: Factory method 'eurekaClient' threw exception; nested exception is java.lang.RuntimeException: Failed to initialize DiscoveryClient!

    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189) ~[spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) ~[spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    ... 29 common frames omitted

Caused by: java.lang.RuntimeException: Failed to initialize DiscoveryClient!

    at com.netflix.discovery.DiscoveryClient.(DiscoveryClient.java:441) ~[eureka-client-1.4.10.jar:1.4.10]

    at com.netflix.discovery.DiscoveryClient.(DiscoveryClient.java:304) ~[eureka-client-1.4.10.jar:1.4.10]

    at org.springframework.cloud.netflix.eureka.CloudEurekaClient.(CloudEurekaClient.java:51) ~[spring-cloud-netflix-eureka-client-1.1.5.RELEASE.jar:1.1.5.RELEASE]

    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.eurekaClient(EurekaClientAutoConfiguration.java:180) ~[spring-cloud-netflix-eureka-client-1.1.5.RELEASE.jar:1.1.5.RELEASE]

    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$445034b.CGLIB$eurekaClient$1() ~[spring-cloud-netflix-eureka-client-1.1.5.RELEASE.jar:1.1.5.RELEASE]

    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$445034b$$FastClassBySpringCGLIB$$718ed4a4.invoke() ~[spring-cloud-netflix-eureka-client-1.1.5.RELEASE.jar:1.1.5.RELEASE]

    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:358) ~[spring-context-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$445034b.eurekaClient() ~[spring-cloud-netflix-eureka-client-1.1.5.RELEASE.jar:1.1.5.RELEASE]

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_152]

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_152]

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_152]

    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_152]

    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ~[spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]

    ... 30 common frames omitted

Caused by: java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/Version

    at com.netflix.discovery.converters.EurekaJacksonCodec.(EurekaJacksonCodec.java:55) ~[eureka-client-1.4.10.jar:1.4.10]

    at com.netflix.discovery.converters.wrappers.CodecWrappers$LegacyJacksonJson.(CodecWrappers.java:285) ~[eureka-client-1.4.10.jar:1.4.10]

    at com.netflix.discovery.converters.wrappers.CodecWrappers.create(CodecWrappers.java:125) ~[eureka-client-1.4.10.jar:1.4.10]

    at com.netflix.discovery.converters.wrappers.CodecWrappers.getEncoder(CodecWrappers.java:75) ~[eureka-client-1.4.10.jar:1.4.10]

    at com.netflix.discovery.converters.wrappers.CodecWrappers.getEncoder(CodecWrappers.java:66) ~[eureka-client-1.4.10.jar:1.4.10]

    at com.netflix.discovery.provider.DiscoveryJerseyProvider.(DiscoveryJerseyProvider.java:68) ~[eureka-client-1.4.10.jar:1.4.10]

    at com.netflix.discovery.shared.transport.jersey.EurekaJerseyClientImpl$EurekaJerseyClientBuilder$MyDefaultApacheHttpClient4Config.(EurekaJerseyClientImpl.java:190) ~[eureka-client-1.4.10.jar:1.4.10]

    at com.netflix.discovery.shared.transport.jersey.EurekaJerseyClientImpl$EurekaJerseyClientBuilder.build(EurekaJerseyClientImpl.java:166) ~[eureka-client-1.4.10.jar:1.4.10]

    at com.netflix.discovery.shared.transport.jersey.JerseyEurekaHttpClientFactory$JerseyEurekaHttpClientFactoryBuilder.buildLegacy(JerseyEurekaHttpClientFactory.java:205) ~[eureka-client-1.4.10.jar:1.4.10]

    at com.netflix.discovery.shared.transport.jersey.JerseyEurekaHttpClientFactory$JerseyEurekaHttpClientFactoryBuilder.build(JerseyEurekaHttpClientFactory.java:186) ~[eureka-client-1.4.10.jar:1.4.10]

    at com.netflix.discovery.shared.transport.jersey.JerseyEurekaHttpClientFactory.create(JerseyEurekaHttpClientFactory.java:143) ~[eureka-client-1.4.10.jar:1.4.10]

    at com.netflix.discovery.shared.transport.jersey.TransportClientFactories.newTransportClientFactory(TransportClientFactories.java:49) ~[eureka-client-1.4.10.jar:1.4.10]

    at com.netflix.discovery.DiscoveryClient.scheduleServerEndpointTask(DiscoveryClient.java:477) ~[eureka-client-1.4.10.jar:1.4.10]

    at com.netflix.discovery.DiscoveryClient.(DiscoveryClient.java:428) ~[eureka-client-1.4.10.jar:1.4.10]

    ... 43 common frames omitted

Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.core.Version

    at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_152]

    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_152]

    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338) ~[na:1.8.0_152]

    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_152]

    ... 57 common frames omitted

Caused by: java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/Version

Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.core.Version

这个两个异常信息是同一个异常的两种不同表示方式。

处理：在 POM.XML 配置文件中，配置  jackson 依赖（红色部分）。

xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0modelVersion>

    <groupId>com.examplegroupId>

    <artifactId>server1artifactId>

    <version>0.0.1-SNAPSHOTversion>

    <packaging>jarpackaging>

    <name>server1name>

    <description>Demo project for Spring Bootdescription>

    <parent>

        <groupId>org.springframework.bootgroupId>

        <artifactId>spring-boot-starter-parentartifactId>

        <version>1.5.13.RELEASEversion>

        <relativePath/> 

    parent>

    

    

    <properties>

        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>

        <java.version>1.8java.version>

    properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.bootgroupId>

            <artifactId>spring-boot-starterartifactId>

        dependency>

        <dependency>

            <groupId>org.springframework.bootgroupId>

            <artifactId>spring-boot-starter-testartifactId>

            <scope>testscope>

        dependency>

         

         

        <dependency>

            <groupId>org.springframework.cloudgroupId>

            <artifactId>spring-cloud-starter-eurekaartifactId>

            <version>1.4.4.RELEASEversion>

        dependency> 

        

        <dependency>

            <groupId>org.springframework.cloudgroupId>

            <artifactId>spring-cloud-starter-netflix-eureka-clientartifactId>

            <version>1.4.4.RELEASEversion>

       dependency>

            

        <dependency>

            <groupId>log4jgroupId>

            <artifactId>log4jartifactId>

            

        dependency>

        

     

    <dependency>

       <groupId>com.fasterxml.jackson.coregroupId>

       <artifactId>jackson-annotationsartifactId>

       <version>2.9.6version>

    dependency>

    

    <dependency>

       <groupId>com.fasterxml.jackson.coregroupId>

       <artifactId>jackson-coreartifactId>

       <version>2.9.6version>

    dependency>

    

    <dependency>

       <groupId>com.fasterxml.jackson.coregroupId>

       <artifactId>jackson-databindartifactId>

       <version>2.9.6version>

    dependency>

    

    dependencies>

    

    <dependencyManagement>

       <dependencies>

          <dependency>

             <groupId>org.springframework.cloudgroupId>

             <artifactId>spring-cloud-dependenciesartifactId>

             <version>Brixton.SR5version>

             <type>pomtype>

             <scope>importscope>

          dependency>

       dependencies>

    dependencyManagement>  

    

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.bootgroupId>

                <artifactId>spring-boot-maven-pluginartifactId>

            plugin>

        plugins>

    build>

project>