同事说他的应用起不来了，因为我的代码里面多了一个空格！
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.taobao.pandora.boot.loader.MainMethodRunner.run(MainMethodRunner.java:54)
at com.taobao.pandora.boot.loader.Launcher.launch(Launcher.java:87)
at com.taobao.pandora.boot.loader.Launcher.launch(Launcher.java:50)
at com.taobao.pandora.boot.loader.SarLauncher.main(SarLauncher.java:171)
Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to process import candidates for configuration class [com.alibaba.fin.xxx.test.CreditXXXStartUp]; nested exception is java.lang.IllegalStateException: Unable to read meta-data for class com.alibaba.fin.table.scanner.autoconfiguration.TDDLTableTopologyBuilderAutoConfiguration
at org.springframework.context.annotation.ConfigurationClassParser.processDeferredImportSelectors(ConfigurationClassParser.java:556)
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:185)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:308)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:228)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:272)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:92)
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:687)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:525)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)
at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:134)
at com.alibaba.fin.xxx.start.CreditpayXXXBootStartUp.main(CreditpayMercuryApplicationBootStartUp.java:88)
... 8 more
Caused by: java.lang.IllegalStateException: Unable to read meta-data for class com.alibaba.fin.table.scanner.autoconfiguration.TDDLTableTopologyBuilderAutoConfiguration
at org.springframework.boot.autoconfigure.AutoConfigurationSorter$AutoConfigurationClass.getAnnotationMetadata(AutoConfigurationSorter.java:217)
at org.springframework.boot.autoconfigure.AutoConfigurationSorter$AutoConfigurationClass.getAnnotationValue(AutoConfigurationSorter.java:198)
at org.springframework.boot.autoconfigure.AutoConfigurationSorter$AutoConfigurationClass.readBefore(AutoConfigurationSorter.java:186)
at org.springframework.boot.autoconfigure.AutoConfigurationSorter$AutoConfigurationClass.(AutoConfigurationSorter.java:158)
at org.springframework.boot.autoconfigure.AutoConfigurationSorter$AutoConfigurationClasses.(AutoConfigurationSorter.java:115)
at org.springframework.boot.autoconfigure.AutoConfigurationSorter.getInPriorityOrder(AutoConfigurationSorter.java:57)
at org.springframework.boot.autoconfigure.AutoConfigurationImportSelector.sort(AutoConfigurationImportSelector.java:241)
at org.springframework.boot.autoconfigure.AutoConfigurationImportSelector.selectImports(AutoConfigurationImportSelector.java:98)
at org.springframework.context.annotation.ConfigurationClassParser.processDeferredImportSelectors(ConfigurationClassParser.java:547)
... 20 more
Caused by: java.io.FileNotFoundException: class path resource [ com/alibaba/fin/table/scanner/autoconfiguration/TDDLTableTopologyBuilderAutoConfiguration.class] cannot be opened because it does not exist
at org.springframework.core.io.ClassPathResource.getInputStream(ClassPathResource.java:172)
at org.springframework.core.type.classreading.SimpleMetadataReader.(SimpleMetadataReader.java:50)
at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:98)
at org.springframework.boot.type.classreading.ConcurrentReferenceCachingMetadataReaderFactory.createMetadataReader(ConcurrentReferenceCachingMetadataReaderFactory.java:89)
at org.springframework.boot.type.classreading.ConcurrentReferenceCachingMetadataReaderFactory.getMetadataReader(ConcurrentReferenceCachingMetadataReaderFactory.java:76)
at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:93)
at org.springframework.boot.autoconfigure.AutoConfigurationSorter$AutoConfigurationClass.getAnnotationMetadata(AutoConfigurationSorter.java:213)
... 28 more
Caused by: java.io.FileNotFoundException: class path resource [ com/alibaba/fin/table/scanner/autoconfiguration/TDDLTableTopologyBuilderAutoConfiguration.class] cannot be opened because it does not exist
[ com/alibaba/fin/table/scanner/autoconfiguration/TDDLTableTopologyBuilderAutoConfiguration.class]
Caused by: java.lang.IllegalStateException: Unable to read meta-data for class com.alibaba.fin.table.scanner.autoconfiguration.TDDLTableTopologyBuilderAutoConfiguration
$ls|grep spring-core
spring-core-4.3.13.RELEASE.jar
$ls|grep spring-core
spring-core-4.3.22.RELEASE.jar
1、从报错信息本身入手。
2、仔细看报错内容，不要忽略任何一个细节，哪怕是一个空格。
3、学会问题猜测，猜测后再验证。
4、请用Google！
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