初学springcloud遇到的奇葩报错之java.io.FileNotFoundException: class path resource [org/springframework/web/context/ServletContextAware

  本人初学springcloud，从网上的大佬(纯洁的微笑)的github上下载了springcloud Eureka的示例代码跑了下，发现报错：java.io.FileNotFoundException: class path resource [org/springframework/web/context/ServletContextAware，用idea和eclipse都试了不行，都报这个错，甚至怀疑是不是他的代码有问题啊。然后到大佬提供的QQ交流群里面咨询了下，群友们也帮我看了下，有个群友还下了代码下来跑了下发现是可以的。这样的话那肯定是我这边的问题了。

具体报错如下，截取其中一小段：

org.springframework.beans.factory.BeanDefinitionStoreException: Failed to process import candidates for configuration class [org.springframework.cloud.netflix.eureka.server.EurekaServerAutoConfiguration]; nested exception is java.io.FileNotFoundException: class path resource [org/springframework/web/context/ServletContextAware.class] cannot be opened because it does not exist
at org.springframework.context.annotation.ConfigurationClassParser.processImports(ConfigurationClassParser.java:616) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:299) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:245) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.processImports(ConfigurationClassParser.java:606) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.processDeferredImportSelectors(ConfigurationClassParser.java:548) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:185) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:308) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:228) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:270) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:93) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:686) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:524) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
at com.neo.SpringCloudEurekaApplication.main(SpringCloudEurekaApplication.java:12) [classes/:na]

最后想想，jdk是使用的1.8的，那个群友也是用的1.8的，maven使用的是3.3.9的，想来想去感觉是不是maven repository有问题呢？然后把之前的maven repository删了重新download一遍再运行一下发现没报错了，成功了。

 

总结：

  从如上的描述来看，出现该报错的原因是我的maven repository出现了问题，中间可能在建立repository的时候出现了错误或者不同版本的jar包，从而导致我在项目中引入jar包的时候出现了jar错乱而引发该错误。因为工程引入有127个jar包，从数据量上来看是没问题的，就是jar包引入错误。

如果哪位兄台知道更具体的原因，欢迎大家留言，谢谢！