mybatis 报错 Invalid bound statement

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用 eclipse 启动 springmvc + mybatis 的项目，报错信息如下:

一、错误信息

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严重: Servlet.service() for servlet [DispatcherServlet] in context with path [/car] threw exception [Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.bjsxt.car.users.dao.ICAdminsDao.login] with root cause
org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.bjsxt.car.users.dao.ICAdminsDao.login
	at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:189)
	at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:43)
	at org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:58)
	at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:51)
	at com.sun.proxy.$Proxy24.login(Unknown Source)
	at com.bjsxt.car.users.service.impl.UserServiceImpl.login(UserServiceImpl.java:82)
	at com.bjsxt.car.controller.AdminsHeadController.login(AdminsHeadController.java:88)
	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:776)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705)
	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:966)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	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.apache.logging.log4j.core.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:66)
	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:505)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:957)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Unknown Source)

二、原因分析：

copy 了一份 mapper.xml 配置文件，忘记修改里面 mapper 中 namespace 属性的值。

三、解决办法：

原来的 mapper.xml 配置文件：

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
  PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!-- 要使用Mapper代码,省去Dao的实现类 -->
<mapper namespace="com.bjsxt.car.users.dao.ICClientDao">
	<!-- 添加一条记录 
		需要返回主键
	-->
	<insert id="saveOneClient" parameterType="com.bjsxt.car.users.pojo.CClient" keyColumn="id" keyProperty="id">
		insert into c_client (name, gender, phone, password, profession, idcard, address) 
		values 
		(#{name},#{gender},#{phone},#{password},#{profession},#{idcard},#{address})
	</insert>
	<select id="login" parameterType="map" resultType="com.bjsxt.car.users.pojo.CAdmins">
		select * from c_admins 
		<where>
			<if test="name != null">
				and name = #{name}
			</if>
			<if test="password != null">
				and password = #{password}
			</if>
		</where> 
	</select>
</mapper>

修改如下，将 mapper 中 namespace 属性的值修改为对应的真正的值：

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
  PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!-- 要使用Mapper代码,省去Dao的实现类 -->
<mapper namespace="com.bjsxt.car.users.dao.ICAdminsDao">
	<!-- 添加一条记录 
		需要返回主键
	-->
	<insert id="saveOneClient" parameterType="com.bjsxt.car.users.pojo.CClient" keyColumn="id" keyProperty="id">
		insert into c_client (name, gender, phone, password, profession, idcard, address) 
		values 
		(#{name},#{gender},#{phone},#{password},#{profession},#{idcard},#{address})
	</insert>
	<select id="login" parameterType="map" resultType="com.bjsxt.car.users.pojo.CAdmins">
		select * from c_admins 
		<where>
			<if test="name != null">
				and name = #{name}
			</if>
			<if test="password != null">
				and password = #{password}
			</if>
		</where> 
	</select>
</mapper>