問題描述：
org.apache.ibatis.builder.IncompleteElementException: Could not find parameter map
說明：
配置參數類型有兩種選擇，即：parameterType和parameterMap
不管參數是否是基本數據類型還是map類型，都是使用parameterType。
parameterMap和resultMap類似，parameterMap通常應用於mapper中有多個參數要傳進來時,表示將查詢結果集中列值的類型一一映射到java對象屬性的類型上，在開發過程中不推薦這種方式。
如果不小心將parameterType寫成了parameterMap，如下：
Mapper.java文件
public Long deletePayer(Map<String, Object> paraMap);
Mapper.xml文件
<delete id="deletePayer" parameterMap="map" > delete from payer_info where id=#{id} </delete>
如果Mapper.xml文件沒有配置對應parameterMap，這樣就會報找不到對應的parameterMap：
org.apache.ibatis.builder.IncompleteElementException: Could not find parameter map com.xxx.yyy.portal.dao.IPayerInfoDao.map at org.apache.ibatis.builder.MapperBuilderAssistant.setStatementParameterMap(MapperBuilderAssistant.java:346) at org.apache.ibatis.builder.MapperBuilderAssistant.addMappedStatement(MapperBuilderAssistant.java:310) at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:109) 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$SqlCommand.<init>(MapperMethod.java:175) at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:38) at org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:49) at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:42) at com.sun.proxy.$Proxy25.getUserInfoByAccount(Unknown Source) at com.xxx.yyy.portal.service.impl.UserInfoServiceImpl.getUserInfoByAccount(UserInfoServiceImpl.java:30) at com.xxx.yyy.portal.controller.UserInfoController.ajaxLogin(UserInfoController.java:59) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:781) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:721) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868) at javax.servlet.http.HttpServlet.service(HttpServlet.java:648) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:724) Caused by: java.lang.IllegalArgumentException: Parameter Maps collection does not contain value for com.xxx.yyy.portal.dao.IPayerInfoDao.map at org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:791) at org.apache.ibatis.session.Configuration.getParameterMap(Configuration.java:570) at org.apache.ibatis.builder.MapperBuilderAssistant.setStatementParameterMap(MapperBuilderAssistant.java:344) ... 54 more
解決方案：
mapper.xml文件正確的寫法：
<delete id="deletePayer" parameterType="map" > delete from payer_info where id=#{id} </delete>
在開發過程中，一定要注意你選擇的是parameterType還是parameterMap，如果你發現你選擇的是parameterMap，這時你就要小心了，很可能這時項目中一個隱藏的bug，而且還不容易發現，因為報錯的信息很模糊，不容易定位到這個問題上來。