tomcat 启动后，可以正常访问 localhost:8080, 但是访问登录接口，返回 500,请问是什么原因啊

来源：6-9 用户模块所有功能自测试

走在全栈的路上

2017-10-16

<!doctype html><html><head><title>HTTP Status 500 – Internal Server Error</title><style type="text/css">h1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} h2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} h3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} body {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} b {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} p {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;} a {color:black;} a.name {color:black;} .line {height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP Status 500 – Internal Server Error</h1><hr /><p><b>Type</b> Exception Report</p><p><b>Message</b> Request processing failed; nested exception is org.apache.ibatis.builder.IncompleteElementException: Could not find parameter map com.mmall.dao.CartMapper.map</p><p><b>Description</b> The server encountered an unexpected condition that prevented it from fulfilling the request.</p><p><b>Exception</b></p><pre>org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.apache.ibatis.builder.IncompleteElementException: Could not find parameter map com.mmall.dao.CartMapper.map

org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:943)

org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:833)

javax.servlet.http.HttpServlet.service(HttpServlet.java:660)

org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807)

javax.servlet.http.HttpServlet.service(HttpServlet.java:741)

org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)

org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)

</pre><p><b>Root Cause</b></p><pre>org.apache.ibatis.builder.IncompleteElementException: Could not find parameter map com.mmall.dao.CartMapper.map

org.apache.ibatis.builder.MapperBuilderAssistant.getStatementParameterMap(MapperBuilderAssistant.java:320)

org.apache.ibatis.builder.MapperBuilderAssistant.addMappedStatement(MapperBuilderAssistant.java:296)

org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:109)

org.apache.ibatis.session.Configuration.buildAllStatements(Configuration.java:760)

org.apache.ibatis.session.Configuration.hasStatement(Configuration.java:730)

org.apache.ibatis.session.Configuration.hasStatement(Configuration.java:725)

org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:210)

org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:48)

org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:59)

org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:52)

com.sun.proxy.$Proxy22.checkUsername(Unknown Source)

com.mmall.service.impl.UserServicelmpl.login(UserServicelmpl.java:23)

com.mmall.controller.protal.UserController.login(UserController.java:33)

sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

java.lang.reflect.Method.invoke(Method.java:498)

org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:214)

org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)

org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)

org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:748)

org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)

org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)

org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)

org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)

org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931)

org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:833)

javax.servlet.http.HttpServlet.service(HttpServlet.java:660)

org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807)

javax.servlet.http.HttpServlet.service(HttpServlet.java:741)

org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)

org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)

</pre><p><b>Root Cause</b></p><pre>java.lang.IllegalArgumentException: Parameter Maps collection does not contain value for com.mmall.dao.CartMapper.map

org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:860)

org.apache.ibatis.session.Configuration.getParameterMap(Configuration.java:632)

org.apache.ibatis.builder.MapperBuilderAssistant.getStatementParameterMap(MapperBuilderAssistant.java:318)