Spring cloud NoClassDefFoundError:Spring Cloud Brixton.SR7和Spring Cloud Camden.SR3中的名称编码器

对于所有Camden版本以及现在的Brixton.SR7，在启动Spring Boot应用程序时，会出现以下与Eureka客户端相关的问题：

java.lang.NoClassDefFoundError:com/thoughtworks/xstream/io/naming/NameCoder

例如，我有一个Spring Boot应用程序，它具有

@EnableDiscoveryClient

注释

最近，我一直在将Spring云依赖项更改回Brixton.SR6，以消除此错误。当然，我想使用最新版本的SpringCloud，但如何以正确的方式修复此错误

谢谢

控制台输出如下所示：

2016-11-30 13:09:50.166  INFO 9248 --- [           main] utoConfigurationReportLoggingInitializer : 

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2016-11-30 13:09:50.177 ERROR 9248 --- [           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-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:51) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:346) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:149) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:112) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:879) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:144) ~[spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:545) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) [spring-boot-1.4.2.RELEASE.jar:1.4.2.RELEASE]
    at com.citifintech.ReferenceZipkinServiceApplication.main(ReferenceZipkinServiceApplication.java:15) [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-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1128) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1022) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:512) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$2.getObject(AbstractBeanFactory.java:345) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.cloud.context.scope.GenericScope$BeanLifecycleWrapper.getBean(GenericScope.java:359) ~[spring-cloud-context-1.1.6.RELEASE.jar:1.1.6.RELEASE]
    at org.springframework.cloud.context.scope.GenericScope.get(GenericScope.java:176) ~[spring-cloud-context-1.1.6.RELEASE.jar:1.1.6.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:340) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.aop.target.SimpleBeanTargetSource.getTarget(SimpleBeanTargetSource.java:35) ~[spring-aop-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:192) ~[spring-aop-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at com.sun.proxy.$Proxy82.getApplications(Unknown Source) ~[na:na]
    at org.springframework.cloud.netflix.eureka.EurekaDiscoveryClientConfiguration.maybeInitializeClient(EurekaDiscoveryClientConfiguration.java:120) ~[spring-cloud-netflix-eureka-client-1.2.3.RELEASE.jar:1.2.3.RELEASE]
    at org.springframework.cloud.netflix.eureka.EurekaDiscoveryClientConfiguration.start(EurekaDiscoveryClientConfiguration.java:97) ~[spring-cloud-netflix-eureka-client-1.2.3.RELEASE.jar:1.2.3.RELEASE]
    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:173) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    ... 14 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.netflix.discovery.EurekaClient]: Factory method 'eurekaClient' threw exception; nested exception is java.lang.RuntimeException: Failed to initialize DiscoveryClient!
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    ... 29 common frames omitted
Caused by: java.lang.RuntimeException: Failed to initialize DiscoveryClient!
    at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:441) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:304) ~[eureka-client-1.4.12.jar:1.4.12]
    at org.springframework.cloud.netflix.eureka.CloudEurekaClient.<init>(CloudEurekaClient.java:51) ~[spring-cloud-netflix-eureka-client-1.2.3.RELEASE.jar:1.2.3.RELEASE]
    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.eurekaClient(EurekaClientAutoConfiguration.java:192) ~[spring-cloud-netflix-eureka-client-1.2.3.RELEASE.jar:1.2.3.RELEASE]
    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$c1700a5f.CGLIB$eurekaClient$1(<generated>) ~[spring-cloud-netflix-eureka-client-1.2.3.RELEASE.jar:1.2.3.RELEASE]
    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$c1700a5f$$FastClassBySpringCGLIB$$3759430b.invoke(<generated>) ~[spring-cloud-netflix-eureka-client-1.2.3.RELEASE.jar:1.2.3.RELEASE]
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:356) ~[spring-context-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$c1700a5f.eurekaClient(<generated>) ~[spring-cloud-netflix-eureka-client-1.2.3.RELEASE.jar:1.2.3.RELEASE]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_111]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_111]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_111]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_111]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ~[spring-beans-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    ... 30 common frames omitted
Caused by: java.lang.NoClassDefFoundError: com/thoughtworks/xstream/io/naming/NameCoder
    at com.netflix.discovery.converters.wrappers.CodecWrappers$XStreamXml.<init>(CodecWrappers.java:358) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.converters.wrappers.CodecWrappers.create(CodecWrappers.java:133) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.converters.wrappers.CodecWrappers.getEncoder(CodecWrappers.java:75) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.converters.wrappers.CodecWrappers.getEncoder(CodecWrappers.java:66) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.provider.DiscoveryJerseyProvider.<init>(DiscoveryJerseyProvider.java:77) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.shared.transport.jersey.EurekaJerseyClientImpl$EurekaJerseyClientBuilder$MyDefaultApacheHttpClient4Config.<init>(EurekaJerseyClientImpl.java:194) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.shared.transport.jersey.EurekaJerseyClientImpl$EurekaJerseyClientBuilder.build(EurekaJerseyClientImpl.java:170) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.shared.transport.jersey.JerseyEurekaHttpClientFactory$JerseyEurekaHttpClientFactoryBuilder.buildLegacy(JerseyEurekaHttpClientFactory.java:205) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.shared.transport.jersey.JerseyEurekaHttpClientFactory$JerseyEurekaHttpClientFactoryBuilder.build(JerseyEurekaHttpClientFactory.java:186) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.shared.transport.jersey.JerseyEurekaHttpClientFactory.create(JerseyEurekaHttpClientFactory.java:143) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.shared.transport.jersey.TransportClientFactories.newTransportClientFactory(TransportClientFactories.java:49) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.DiscoveryClient.scheduleServerEndpointTask(DiscoveryClient.java:477) ~[eureka-client-1.4.12.jar:1.4.12]
    at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:428) ~[eureka-client-1.4.12.jar:1.4.12]
    ... 43 common frames omitted
Caused by: java.lang.ClassNotFoundException: com.thoughtworks.xstream.io.naming.NameCoder
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_111]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_111]
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) ~[na:1.8.0_111]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_111]
    ... 56 common frames omitted

最后是

bootstrap.properties

spring.application.name=client-service
spring.cloud.config.uri=http://localhost:8888

---

我花了一些时间仔细研究了这个问题……所以这个异常是由

xstream

库中缺少

nameconder

类引起的。此库由

Eureka

实现使用

现在，

xstream

到目前为止的最新版本是1.4.9，它包含在

Camden.SR3

和

Brixton.SR7

的托管依赖项中

包含

NameCoder

类的最新版本是

xstream-1.4.8

，因此我必须在声明eureka依赖项的地方修改

pom.xml

，对于我的所有项目，eureka服务器或客户端都使用依赖项

xstream

1.4.8版，而不是

Camden.SR3

托管依赖项提供的。可以肯定的是，在maven中，根据项目的结构，有几种方法可以实现这一点，但最直接的方法如下：

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-eureka</artifactId>
    <exclusions>
        <exclusion>
            <groupId>com.thoughtworks.xstream</groupId>
            <artifactId>xstream</artifactId>                        
        </exclusion>
     </exclusions>
</dependency>       

<dependency>
    <groupId>com.thoughtworks.xstream</groupId>
    <artifactId>xstream</artifactId>
    <version>1.4.8</version><!--$NO-MVN-MAN-VER$-->
</dependency>

org.springframework.cloud
春云起动器尤里卡
com.thoughtworks.xstream
xstream
com.thoughtworks.xstream
xstream
1.4.8

---

现在，需要注意的是，Eureka当前的实现如何使用

NameCoder

类，因为Spring Cloud

Camden.SR3

和

Brixton.SR7

发行的

xstream

库的版本是

xstream-1.4.9

，它没有精确的这个类？可能这个问题在测试包期间被忽略了，因为maven最终自动解决了一些多个依赖项，但是在使用最新版本的Spring Cloud实现Eureka服务时，至少在目前，有必要进行此更改。

我也遇到了同样的问题。这与xstream的一个旧包含相关（

xstream:xstream:jar:1.1.3:compile

）。 xstream库change groupId和Spring cloud使用新版本（

com.thoughtworks.xstream:xstream:jar:1.4.9:compile

）

使用

mvn dependency:tree

命令检查类路径中是否有两个库。然后可以使用maven排除从类路径中删除旧的排除

<dependency>
    <groupId>GROUPID</groupId>
    <artifactId>ARTIFACTID</artifactId>
    <version>X.Y.Z</version>
    <exclusions>
        <exclusion>
            <groupId>xstream</groupId>
            <artifactId>xstream</artifactId>
        </exclusion>
    </exclusions>
</dependency>

GROUPID
人工的
X.Y.Z
xstream
xstream

我们以前从未见过这种情况。是否要共享一个重新创建问题的项目？您好，Spence刚刚添加了

pom.xml

、

bootstrap.properties

和项目的主类。

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-eureka</artifactId>
    <exclusions>
        <exclusion>
            <groupId>com.thoughtworks.xstream</groupId>
            <artifactId>xstream</artifactId>                        
        </exclusion>
     </exclusions>
</dependency>       

<dependency>
    <groupId>com.thoughtworks.xstream</groupId>
    <artifactId>xstream</artifactId>
    <version>1.4.8</version><!--$NO-MVN-MAN-VER$-->
</dependency>

<dependency>
    <groupId>GROUPID</groupId>
    <artifactId>ARTIFACTID</artifactId>
    <version>X.Y.Z</version>
    <exclusions>
        <exclusion>
            <groupId>xstream</groupId>
            <artifactId>xstream</artifactId>
        </exclusion>
    </exclusions>
</dependency>