Mybatis错误——Could not find parameter map java.util.Map

错误信息

org.apache.ibatis.builder.IncompleteElementException: Could not find parameter map java.util.Map
    at org.apache.ibatis.builder.MapperBuilderAssistant.setStatementParameterMap(MapperBuilderAssistant.java:319)
    at org.apache.ibatis.builder.MapperBuilderAssistant.addMappedStatement(MapperBuilderAssistant.java:283)
    at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:107)
    at org.apache.ibatis.session.Configuration.buildAllStatements(Configuration.java:698)
    at org.apache.ibatis.session.Configuration.hasStatement(Configuration.java:668)
    at org.apache.ibatis.session.Configuration.hasStatement(Configuration.java:663)
    at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:180)
    at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:43)
    at org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:58)
    at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:51)
    at com.sun.proxy.$Proxy30.getStudentByAccountAndPwd(Unknown Source)
    at com.taohan.online.exam.service.impl.StudentInfoServiceImpl.getStudentByAccountAndPwd(StudentInfoServiceImpl.java:54)
    at com.taohan.online.exam.handler.StudentInfoHandler.validateLoginStudent(StudentInfoHandler.java:190)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:222)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:814)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:737)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:969)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:871)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:845)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalArgumentException: Parameter Maps collection does not contain value for java.util.Map
    at org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:797)
    at org.apache.ibatis.session.Configuration.getParameterMap(Configuration.java:570)
    at org.apache.ibatis.builder.MapperBuilderAssistant.setStatementParameterMap(MapperBuilderAssistant.java:317)
    ... 49 more

解决

　　光看表面意思就是不能找到参数 map，光看表面可能会把你带到另一个方向。

　　但实际就是在 Mapper 文件中将某个 statement 的 parameterType 错写成了 parameterMap。

　　<select id="getChooseInfoWithSumScore" parameterMap="java.util.Map"（错误源） resultMap="queryChooseInfosResultMap">
         SELECT
        a.chooseId,
        a.chooseResult,
        a.subjectId,
        b.rightResult,
        b.subjectScore
        FROM ExamChooseInfo a
        INNER JOIN subjectInfo b ON a.subjectId=b.subjectId
        WHERE studentId=#{studentId} AND examPaperId=#{examPaperId};
     </select>