1. org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'com/imooc/hospital/dao/CategoryDao.xml'. Cause: java.lang.IllegalArgumentException: Mapped Statements collection already contains value for com.imooc.hospital.dao.CategoryDao.getCategoryById
  2.     at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:120)
  3.     at org.apache.ibatis.builder.xml.XMLMapperBuilder.parse(XMLMapperBuilder.java:92)
  4.     at org.apache.ibatis.builder.annotation.MapperAnnotationBuilder.loadXmlResource(MapperAnnotationBuilder.java:173)
  5.     at org.apache.ibatis.builder.annotation.MapperAnnotationBuilder.parse(MapperAnnotationBuilder.java:124)
  6.     at org.apache.ibatis.binding.MapperRegistry.addMapper(MapperRegistry.java:72)
  7.     at org.apache.ibatis.session.Configuration.addMapper(Configuration.java:741)
  8.     at org.mybatis.spring.mapper.MapperFactoryBean.checkDaoConfig(MapperFactoryBean.java:80)
  9.     at org.springframework.dao.support.DaoSupport.afterPropertiesSet(DaoSupport.java:44)
  10.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1692)
  11.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1630)
  12.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
  13.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
  14.     at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312)
  15.     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
  16.     at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308)
  17.     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
  18.     at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:522)
  19.     at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:496)
  20.     at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:627)
  21.     at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:169)
  22.     at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
  23.     at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:318)
  24.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1272)
  25.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
  26.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
  27.     at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312)
  28.     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
  29.     at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308)
  30.     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
  31.     at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208)
  32.     at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)
  33.     at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)
  34.     at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585)
  35.     at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
  36.     at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366)
  37.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1272)
  38.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
  39.     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
  40.     at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312)
  41.     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
  42.     at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308)
  43.     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
  44.     at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)
  45.     at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867)
  46.     at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543)
  47.     at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
  48.     at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
  49.     at com.imooc.hospital.global.DispatcherServlet.init(DispatcherServlet.java:22)
  50.     at javax.servlet.GenericServlet.init(GenericServlet.java:158)
  51.     at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1230)
  52.     at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1174)
  53.     at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:847)
  54.     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)
  55.     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
  56.     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:498)
  57.     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
  58.     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
  59.     at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025)
  60.     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
  61.     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
  62.     at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1115)
  63.     at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
  64.     at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
  65.     at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)
  66.     at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
  67.     at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
  68.     at java.base/java.lang.Thread.run(Thread.java:844)
  69. Caused by: java.lang.IllegalArgumentException: Mapped Statements collection already contains value for com.imooc.hospital.dao.CategoryDao.getCategoryById
  70.     at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:872)
  71.     at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:844)
  72.     at org.apache.ibatis.session.Configuration.addMappedStatement(Configuration.java:668)
  73.     at org.apache.ibatis.builder.MapperBuilderAssistant.addMappedStatement(MapperBuilderAssistant.java:302)
  74.     at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:109)
  75.     at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:135)
  76.     at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:128)
  77.     at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:118)
  78.     ... 66 more
  79.  

1、可知是com/imooc/hospital/dao/CategoryDao.xml其中某个配置扫描了两遍

2、

查看原因：Mapped Statements collection already contains value for com.imooc.hospital.dao.CategoryDao.getCategoryById

可知道是getCategoryById扫描了两遍，检查ID发现有两个相同的ID，修改ID运行正确

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