异常：java.lang.IllegalArgumentException: Result Maps collection already contains value
今天学习SSM整合遇到问题找了好久，特此将问题记录下来，希望能帮助更多的xdm
D:\JAVA\jkd\jdk-8\bin\java.exe -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:D:\JAVA\IntelliJ IDEA 2018.3.5\lib\idea_rt.jar=61026:D:\JAVA\IntelliJ IDEA 2018.3.5\bin" -Dfile.encoding=UTF-8 -classpath "D:\JAVA\IntelliJ IDEA 2018.3.5\lib\idea_rt.jar;D:\JAVA\IntelliJ IDEA 2018.3.5\plugins\junit\lib\junit-rt.jar;D:\JAVA\IntelliJ IDEA 2018.3.5\plugins\junit\lib\junit5-rt.jar;D:\JAVA\jkd\jdk-8\jre\lib\charsets.jar;D:\JAVA\jkd\jdk-8\jre\lib\deploy.jar;D:\JAVA\jkd\jdk-8\jre\lib\ext\access-bridge-64.jar;D:\JAVA\jkd\jdk-8\jre\lib\ext\cldrdata.jar;D:\JAVA\jkd\jdk-8\jre\lib\ext\dnsns.jar;D:\JAVA\jkd\jdk-8\jre\lib\ext\jaccess.jar;D:\JAVA\jkd\jdk-8\jre\lib\ext\jfxrt.jar;D:\JAVA\jkd\jdk-8\jre\lib\ext\localedata.jar;D:\JAVA\jkd\jdk-8\jre\lib\ext\nashorn.jar;D:\JAVA\jkd\jdk-8\jre\lib\ext\sunec.jar;D:\JAVA\jkd\jdk-8\jre\lib\ext\sunjce_provider.jar;D:\JAVA\jkd\jdk-8\jre\lib\ext\sunmscapi.jar;D:\JAVA\jkd\jdk-8\jre\lib\ext\sunpkcs11.jar;D:\JAVA\jkd\jdk-8\jre\lib\ext\zipfs.jar;D:\JAVA\jkd\jdk-8\jre\lib\javaws.jar;D:\JAVA\jkd\jdk-8\jre\lib\jce.jar;D:\JAVA\jkd\jdk-8\jre\lib\jfr.jar;D:\JAVA\jkd\jdk-8\jre\lib\jfxswt.jar;D:\JAVA\jkd\jdk-8\jre\lib\jsse.jar;D:\JAVA\jkd\jdk-8\jre\lib\management-agent.jar;D:\JAVA\jkd\jdk-8\jre\lib\plugin.jar;D:\JAVA\jkd\jdk-8\jre\lib\resources.jar;D:\JAVA\jkd\jdk-8\jre\lib\rt.jar;D:\JAVA\mysql-connector-java-5.1.38.jar;D:\JAVA\mysql-connector-java-5.0.8-bin.jar;D:\JAVA\IDEA word\ssm-crud\target\classes;D:\JAVA\apache-maven-3.6.0\repository\org\projectlombok\lombok\1.18.12\lombok-1.18.12.jar;D:\JAVA\apache-maven-3.6.0\repository\org\springframework\spring-test\5.2.9.RELEASE\spring-test-5.2.9.RELEASE.jar;D:\JAVA\apache-maven-3.6.0\repository\org\springframework\spring-core\5.2.9.RELEASE\spring-core-5.2.9.RELEASE.jar;D:\JAVA\apache-maven-3.6.0\repository\org\springframework\spring-jcl\5.2.9.RELEASE\spring-jcl-5.2.9.RELEASE.jar;D:\JAVA\apache-maven-3.6.0\repository\junit\junit\4.13.1\junit-4.13.1.jar;D:\JAVA\apache-maven-3.6.0\repository\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar;D:\JAVA\apache-maven-3.6.0\repository\mysql\mysql-connector-java\5.1.47\mysql-connector-java-5.1.47.jar;D:\JAVA\apache-maven-3.6.0\repository\com\mchange\c3p0\0.9.5.2\c3p0-0.9.5.2.jar;D:\JAVA\apache-maven-3.6.0\repository\com\mchange\mchange-commons-java\0.2.11\mchange-commons-java-0.2.11.jar;D:\JAVA\apache-maven-3.6.0\repository\javax\servlet\servlet-api\2.5\servlet-api-2.5.jar;D:\JAVA\apache-maven-3.6.0\repository\javax\servlet\jsp\jsp-api\2.2\jsp-api-2.2.jar;D:\JAVA\apache-maven-3.6.0\repository\javax\servlet\jstl\1.2\jstl-1.2.jar;D:\JAVA\apache-maven-3.6.0\repository\org\mybatis\mybatis\3.5.3\mybatis-3.5.3.jar;D:\JAVA\apache-maven-3.6.0\repository\org\mybatis\mybatis-spring\2.0.2\mybatis-spring-2.0.2.jar;D:\JAVA\apache-maven-3.6.0\repository\org\springframework\spring-webmvc\5.1.9.RELEASE\spring-webmvc-5.1.9.RELEASE.jar;D:\JAVA\apache-maven-3.6.0\repository\org\springframework\spring-aop\5.1.9.RELEASE\spring-aop-5.1.9.RELEASE.jar;D:\JAVA\apache-maven-3.6.0\repository\org\springframework\spring-beans\5.1.9.RELEASE\spring-beans-5.1.9.RELEASE.jar;D:\JAVA\apache-maven-3.6.0\repository\org\springframework\spring-context\5.1.9.RELEASE\spring-context-5.1.9.RELEASE.jar;D:\JAVA\apache-maven-3.6.0\repository\org\springframework\spring-expression\5.1.9.RELEASE\spring-expression-5.1.9.RELEASE.jar;D:\JAVA\apache-maven-3.6.0\repository\org\springframework\spring-web\5.1.9.RELEASE\spring-web-5.1.9.RELEASE.jar;D:\JAVA\apache-maven-3.6.0\repository\org\springframework\spring-jdbc\4.3.7.RELEASE\spring-jdbc-4.3.7.RELEASE.jar;D:\JAVA\apache-maven-3.6.0\repository\org\springframework\spring-tx\4.3.7.RELEASE\spring-tx-4.3.7.RELEASE.jar;D:\JAVA\apache-maven-3.6.0\repository\org\springframework\spring-aspects\4.3.7.RELEASE\spring-aspects-4.3.7.RELEASE.jar;D:\JAVA\apache-maven-3.6.0\repository\org\aspectj\aspectjweaver\1.8.9\aspectjweaver-1.8.9.jar;D:\JAVA\apache-maven-3.6.0\repository\org\mybatis\generator\mybatis-generator-core\1.3.7\mybatis-generator-core-1.3.7.jar" com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 -junit4 com.oykq.test.Mappertest,testCRUD
一月 15, 2022 9:03:07 下午 org.springframework.test.context.support.AbstractTestContextBootstrapper getDefaultTestExecutionListenerClassNames
信息: Loaded default TestExecutionListener class names from location [META-INF/spring.factories]: [org.springframework.test.context.web.ServletTestExecutionListener, org.springframework.test.context.support.DirtiesContextBeforeModesTestExecutionListener, org.springframework.test.context.support.DependencyInjectionTestExecutionListener, org.springframework.test.context.support.DirtiesContextTestExecutionListener, org.springframework.test.context.transaction.TransactionalTestExecutionListener, org.springframework.test.context.jdbc.SqlScriptsTestExecutionListener, org.springframework.test.context.event.EventPublishingTestExecutionListener]
一月 15, 2022 9:03:07 下午 org.springframework.test.context.support.AbstractTestContextBootstrapper getTestExecutionListeners
信息: Using TestExecutionListeners: [org.springframework.test.context.web.ServletTestExecutionListener@64bf3bbf, org.springframework.test.context.support.DirtiesContextBeforeModesTestExecutionListener@55d56113, org.springframework.test.context.support.DependencyInjectionTestExecutionListener@148080bb, org.springframework.test.context.support.DirtiesContextTestExecutionListener@dc24521, org.springframework.test.context.transaction.TransactionalTestExecutionListener@10bdf5e5, org.springframework.test.context.jdbc.SqlScriptsTestExecutionListener@6e1ec318, org.springframework.test.context.event.EventPublishingTestExecutionListener@7e0b0338]
一月 15, 2022 9:03:08 下午 com.mchange.v2.log.MLog
信息: MLog clients using java 1.4+ standard logging.
一月 15, 2022 9:03:09 下午 com.mchange.v2.c3p0.C3P0Registry
信息: Initializing c3p0-0.9.5.2 [built 08-December-2015 22:06:04 -0800; debug? true; trace: 10]
一月 15, 2022 9:03:10 下午 org.springframework.context.support.AbstractApplicationContext refresh
警告: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'SqlSessionFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [D:\JAVA\IDEA word\ssm-crud\target\classes\mapper\DepartmentMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\JAVA\IDEA word\ssm-crud\target\classes\mapper\DepartmentMapper.xml]'. Cause: java.lang.IllegalArgumentException: Result Maps collection already contains value for com.oykq.dao.DepartmentMapper.BaseResultMap
一月 15, 2022 9:03:10 下午 org.springframework.test.context.TestContextManager prepareTestInstance
严重: Caught exception while allowing TestExecutionListener [org.springframework.test.context.support.DependencyInjectionTestExecutionListener@148080bb] to prepare test instance [com.oykq.test.Mappertest@7fc4780b]
java.lang.IllegalStateException: Failed to load ApplicationContext
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:132)
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:123)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:118)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:244)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:227)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:246)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'SqlSessionFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [D:\JAVA\IDEA word\ssm-crud\target\classes\mapper\DepartmentMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\JAVA\IDEA word\ssm-crud\target\classes\mapper\DepartmentMapper.xml]'. Cause: java.lang.IllegalArgumentException: Result Maps collection already contains value for com.oykq.dao.DepartmentMapper.BaseResultMap
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1778)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:826)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:127)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:275)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:243)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124)
... 25 more
Caused by: org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [D:\JAVA\IDEA word\ssm-crud\target\classes\mapper\DepartmentMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\JAVA\IDEA word\ssm-crud\target\classes\mapper\DepartmentMapper.xml]'. Cause: java.lang.IllegalArgumentException: Result Maps collection already contains value for com.oykq.dao.DepartmentMapper.BaseResultMap
at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:596)
at org.mybatis.spring.SqlSessionFactoryBean.afterPropertiesSet(SqlSessionFactoryBean.java:475)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1837)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1774)
... 40 more
Caused by: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\JAVA\IDEA word\ssm-crud\target\classes\mapper\DepartmentMapper.xml]'. Cause: java.lang.IllegalArgumentException: Result Maps collection already contains value for com.oykq.dao.DepartmentMapper.BaseResultMap
at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:122)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.parse(XMLMapperBuilder.java:94)
at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:594)
... 43 more
Caused by: java.lang.IllegalArgumentException: Result Maps collection already contains value for com.oykq.dao.DepartmentMapper.BaseResultMap
at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:947)
at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:903)
at org.apache.ibatis.session.Configuration.addResultMap(Configuration.java:660)
at org.apache.ibatis.builder.MapperBuilderAssistant.addResultMap(MapperBuilderAssistant.java:209)
at org.apache.ibatis.builder.ResultMapResolver.resolve(ResultMapResolver.java:47)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java:289)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java:253)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElements(XMLMapperBuilder.java:245)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:118)
... 45 more
java.lang.IllegalStateException: Failed to load ApplicationContext
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:132)
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:123)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:118)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:244)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:227)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:246)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'SqlSessionFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [D:\JAVA\IDEA word\ssm-crud\target\classes\mapper\DepartmentMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\JAVA\IDEA word\ssm-crud\target\classes\mapper\DepartmentMapper.xml]'. Cause: java.lang.IllegalArgumentException: Result Maps collection already contains value for com.oykq.dao.DepartmentMapper.BaseResultMap
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1778)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:826)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:127)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:275)
at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:243)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124)
... 25 more
Caused by: org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [D:\JAVA\IDEA word\ssm-crud\target\classes\mapper\DepartmentMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\JAVA\IDEA word\ssm-crud\target\classes\mapper\DepartmentMapper.xml]'. Cause: java.lang.IllegalArgumentException: Result Maps collection already contains value for com.oykq.dao.DepartmentMapper.BaseResultMap
at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:596)
at org.mybatis.spring.SqlSessionFactoryBean.afterPropertiesSet(SqlSessionFactoryBean.java:475)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1837)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1774)
... 40 more
Caused by: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\JAVA\IDEA word\ssm-crud\target\classes\mapper\DepartmentMapper.xml]'. Cause: java.lang.IllegalArgumentException: Result Maps collection already contains value for com.oykq.dao.DepartmentMapper.BaseResultMap
at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:122)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.parse(XMLMapperBuilder.java:94)
at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:594)
... 43 more
Caused by: java.lang.IllegalArgumentException: Result Maps collection already contains value for com.oykq.dao.DepartmentMapper.BaseResultMap
at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:947)
at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:903)
at org.apache.ibatis.session.Configuration.addResultMap(Configuration.java:660)
at org.apache.ibatis.builder.MapperBuilderAssistant.addResultMap(MapperBuilderAssistant.java:209)
at org.apache.ibatis.builder.ResultMapResolver.resolve(ResultMapResolver.java:47)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java:289)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java:253)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElements(XMLMapperBuilder.java:245)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:118)
... 45 more
这是我的代码错误，不要觉得多就麻烦啦，直接看关键问题
找到核心异常
Cause: java.lang.IllegalArgumentException: Result Maps collection already contains value for com.oykq.dao.DepartmentMapper.BaseResultMap这里原因是BaseResultMap出了问题，这个mapper.xml都是自动生成的怎么会有问题，原因是BaseResultMap这个结果出现了多次。也就是有两个或者多个 id 为BaseResultMap。
解决办法
最后找到报错的 mapper.xml 文件，查看id=”BaseResultMap“果然出现了两次BaseResultMap。
这个问题的产生原因是：使用 mybatis 逆向工程多次生成 mapper 时，未将之前生成的 mapper.xml 删除，导致其在原有的xml里面追加内容。最终导致 BaseResultMap 重复。删除已生生成的 mapper.xml 文件， 重新生成即可。
总结
mapper.xml里面不能有同样的id名，否则就会报上面类似的异常 。
如果对你有帮助，就点个赞，写得不好的地方请多多指教，能帮助到你是对我最好的回报~