SSM时遇到的异常（5）——TooManyResultsException: Expected one result (or null) to be returned by selectOne(),

JDK1.7+Tomcat7.0+Eclipse+SSM 

严重: Servlet.service() for servlet [SpringMVC] in context with path [/MVCQ] threw exception [Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 2] with root cause
org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 2
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:63)
	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.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:355)
	at com.sun.proxy.$Proxy14.selectOne(Unknown Source)
	at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:160)
	at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:95)
	at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:40)
	at com.sun.proxy.$Proxy15.empByNameAndPwd(Unknown Source)
	at com.qiu.service.EmpService.login(EmpService.java:56)
	at com.qiu.service.EmpService$$FastClassBySpringCGLIB$$f54dc904.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:717)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
	at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:653)
	at com.qiu.service.EmpService$$EnhancerBySpringCGLIB$$b12e93a5.login(<generated>)
	at com.qiu.controller.LoginController.login(LoginController.java:189)
	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:221)
	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.invokeHandleMethod(RequestMappingHandlerAdapter.java:777)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:706)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
	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:646)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	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:241)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:315)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

我都被弄得莫名其妙！！！太多Result导致异常？？？最终，我换个浏览器，页面正常。。。。。。

当然报错，不可能，无缘无故 T_T ！！！

1.一开始

因为,

代码（list和find没有合并,也就是"查询"和"列表"不在同一个方法）:

2.接着

（前提：在合并之前，login页面和EmpList页面都是运行正常，只是“当年龄输入框中没有输入值时，点击查询按钮会立即报400”这样的问题）

所以为了不报400、方便，试着将“list”和“find”方法，合并：

扩展：SpringMVC的controller向jsp传递数据的五种方式详解【ModelMap、Map与Model效果差不多，但还是存在区别】

3.再接着

合并之后，我想着先从"登录"页面转向"员工列表"页面，所以我先刷新，从login.jsp进入，

当我点击“登录”按钮后，就报这样的异常！！！接着，把改了的代码都“撤消”！！！还是继续这样的报错！！！再接着，我重启Tomcat几次，再以相同的方式进去，错误继续显示出来！！！我重启Eclipse几次，再以相同的方式进去，错误继续显示出来！！！

 再再接着，我只能，URL栏，输入“http://localhost:8080/MVCQ/emp/list”，并没有跳出异常！！！login页面没错，list（）方法转向EmpList页面也没错，我就纳闷了，怎么会这样，在该浏览器（2345加速浏览器），换了窗口，再以相同的方式进去，错误继续显示出来！！！我百度，搜的这些文章，都可以参考，

（1）Spring mvc+mybatis框架下的TooManyResultsException异常【将方法Bean类型改为List<Bean>类型】

（2）

MyBatis报TooManyResultsException: Expected one result to be returned by selectOne()异常【将selectOne方法换成selectList或将多余（指empName或name相同的）的数据清理掉】

或者

mybatis中的一个异常：org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to

或者

MyBatis的TooManyResultsException异常的解决办法

可是对于我，也就只能看看，却不能解决我的问题，因为最后：我换其他浏览器（谷歌），以相同的方式进去，正常显示EmpList页面！！！

SelectOne源码学习（异常中显示的selectOne()函数了解一波）

Mybatis selectOne方法执行sql有数据返回为null【select标签增加了resultMap属性】

4.最后的最后

400异常我已解决 【点击蓝色字，立马转向对应文章】