JAVA高级面试进阶训练营视频教程

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异常如下：

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-11-21 18:13:43.282 [main] ERROR org.springframework.boot.SpringApplication - Application startup failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'approvalRecordRpc' defined in file [F:\Demo\workspase\Products\product-provider\target\classes\cn\vpclub\easywork\product\provider\rpc\ApprovalRecordRpc.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'approvalRecordServiceImpl': Unsatisfied dependency expressed through field 'baseMapper'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'approvalRecordMapper' defined in file [F:\Demo\workspase\Products\product-provider\target\classes\cn\vpclub\easywork\product\provider\mapper\ApprovalRecordMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mybatisSqlSessionFactoryBean' defined in class path resource [cn/vpclub/spring/boot/mybatisplus/autoconfigure/DatasourceConfiguration.class]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [F:\Demo\workspase\Products\product-provider\target\classes\cn\vpclub\easywork\product\provider\mapper\xml\ApprovalRecordMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'cn.vpclub.moses.product.provider.entity.ApprovalRecord'. Cause: java.lang.ClassNotFoundException: Cannot find class: cn.vpclub.moses.product.provider.entity.ApprovalRecord
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749)
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:189)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1193)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1095)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
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 cn.vpclub.easywork.product.provider.ProviderApplication.main(ProviderApplication.java:15)
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'approvalRecordServiceImpl': Unsatisfied dependency expressed through field 'baseMapper'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'approvalRecordMapper' defined in file [F:\Demo\workspase\Products\product-provider\target\classes\cn\vpclub\easywork\product\provider\mapper\ApprovalRecordMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mybatisSqlSessionFactoryBean' defined in class path resource [cn/vpclub/spring/boot/mybatisplus/autoconfigure/DatasourceConfiguration.class]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [F:\Demo\workspase\Products\product-provider\target\classes\cn\vpclub\easywork\product\provider\mapper\xml\ApprovalRecordMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'cn.vpclub.moses.product.provider.entity.ApprovalRecord'. Cause: java.lang.ClassNotFoundException: Cannot find class: cn.vpclub.moses.product.provider.entity.ApprovalRecord
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:835)
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741)
... 17 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'approvalRecordMapper' defined in file [F:\Demo\workspase\Products\product-provider\target\classes\cn\vpclub\easywork\product\provider\mapper\ApprovalRecordMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mybatisSqlSessionFactoryBean' defined in class path resource [cn/vpclub/spring/boot/mybatisplus/autoconfigure/DatasourceConfiguration.class]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [F:\Demo\workspase\Products\product-provider\target\classes\cn\vpclub\easywork\product\provider\mapper\xml\ApprovalRecordMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'cn.vpclub.moses.product.provider.entity.ApprovalRecord'. Cause: java.lang.ClassNotFoundException: Cannot find class: cn.vpclub.moses.product.provider.entity.ApprovalRecord
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireByType(AbstractAutowireCapableBeanFactory.java:1357)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1249)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585)
... 31 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mybatisSqlSessionFactoryBean' defined in class path resource [cn/vpclub/spring/boot/mybatisplus/autoconfigure/DatasourceConfiguration.class]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [F:\Demo\workspase\Products\product-provider\target\classes\cn\vpclub\easywork\product\provider\mapper\xml\ApprovalRecordMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'cn.vpclub.moses.product.provider.entity.ApprovalRecord'. Cause: java.lang.ClassNotFoundException: Cannot find class: cn.vpclub.moses.product.provider.entity.ApprovalRecord
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireByType(AbstractAutowireCapableBeanFactory.java:1342)
... 42 common frames omitted
Caused by: org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [F:\Demo\workspase\Products\product-provider\target\classes\cn\vpclub\easywork\product\provider\mapper\xml\ApprovalRecordMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'cn.vpclub.moses.product.provider.entity.ApprovalRecord'. Cause: java.lang.ClassNotFoundException: Cannot find class: cn.vpclub.moses.product.provider.entity.ApprovalRecord
at com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean.buildSqlSessionFactory(MybatisSqlSessionFactoryBean.java:574)
at com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean.afterPropertiesSet(MybatisSqlSessionFactoryBean.java:406)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624)
... 52 common frames omitted
Caused by: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'cn.vpclub.moses.product.provider.entity.ApprovalRecord'. Cause: java.lang.ClassNotFoundException: Cannot find class: cn.vpclub.moses.product.provider.entity.ApprovalRecord
at com.baomidou.mybatisplus.MybatisXMLMapperBuilder.configurationElement(MybatisXMLMapperBuilder.java:138)
at com.baomidou.mybatisplus.MybatisXMLMapperBuilder.parse(MybatisXMLMapperBuilder.java:111)
at com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean.buildSqlSessionFactory(MybatisSqlSessionFactoryBean.java:572)
... 55 common frames omitted
Caused by: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'cn.vpclub.moses.product.provider.entity.ApprovalRecord'. Cause: java.lang.ClassNotFoundException: Cannot find class: cn.vpclub.moses.product.provider.entity.ApprovalRecord
at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:118)
at com.baomidou.mybatisplus.MybatisXMLMapperBuilder.resultMapElement(MybatisXMLMapperBuilder.java:285)
at com.baomidou.mybatisplus.MybatisXMLMapperBuilder.resultMapElement(MybatisXMLMapperBuilder.java:274)
at com.baomidou.mybatisplus.MybatisXMLMapperBuilder.resultMapElements(MybatisXMLMapperBuilder.java:266)
at com.baomidou.mybatisplus.MybatisXMLMapperBuilder.configurationElement(MybatisXMLMapperBuilder.java:134)
... 57 common frames omitted
Caused by: org.apache.ibatis.type.TypeException: Could not resolve type alias 'cn.vpclub.moses.product.provider.entity.ApprovalRecord'. Cause: java.lang.ClassNotFoundException: Cannot find class: cn.vpclub.moses.product.provider.entity.ApprovalRecord
at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:120)
at org.apache.ibatis.builder.BaseBuilder.resolveAlias(BaseBuilder.java:149)
at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:116)
... 61 common frames omitted
Caused by: java.lang.ClassNotFoundException: Cannot find class: cn.vpclub.moses.product.provider.entity.ApprovalRecord
at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:200)
at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:89)
at org.apache.ibatis.io.Resources.classForName(Resources.java:261)
at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:116)
... 63 common frames omitted

解决办法：

由异常可知，所有的错误都跟ApprovalRecord类相关，根据错误提示，找不到cn.vpclub.moses.product.provider.entity.ApprovalRecord，问题在于我的项目是在cn.vpclub.easywork..下面。故此分析是在复制代码的时候，包的问题没解决。仔细寻找一遍，发现两处错误，一处是在ApprovalRecord的proto配置里面，指定包名出错。

一处是在Mapper.xml中

此两处错误导致编译不通过，报错，将错误处改正过来，就解决了

分析：此类错误多是配置和包名亦或是自动生成代码时数据库异常导致，根据问题提示，到具体地方查看，总能会有所发现