title: Mapped Statements collection does not contain value for mybatis mapper
body: <p>I am user mybatis and spring to create some test website. Right now I got a problem when trying to use mybatis xml mapper. Issue is something like "java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.cooldrinker.mybatis.mapper.AdminMapper.getAdminByUsername"</p>
  
  <p>servlet.xml</p>
  
  <pre><code>&lt;bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"&gt;
          &lt;property name="dataSource" ref="dataSource" /&gt;
          &lt;property name="typeAliasesPackage" value="com.cooldrinker.mybatis.model"/&gt;
          &lt;property name="mapperLocations" value="classpath*:com/cooldrinker/mybatis/mapper/*.xml" /&gt;
      &lt;/bean&gt;
  </code></pre>
  
  <p>Java mapper</p>
  
  <pre><code>package com.cooldrinker.mybatis.mapper;
  
  import com.cooldrinker.mybatis.model.Admin;
  
  public interface AdminMapper {
      public Admin getAdminByUsername(String username);
  }
  </code></pre>
  
  <p>xml mapper</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8" ?&gt;
  
  &lt;!DOCTYPE mapper
  PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"&gt;
  
  &lt;mapper namespace="com.cooldrinker.mybatis.mapper.AdminMapper"&gt;
      &lt;select id="getAdminByUsername" parameterType="java.lang.String" resultType="adminResultMap"&gt;
          SELECT first_name, last_name, password, username
          FROM admin
          WHERE username = #{username}
      &lt;/select&gt;
  
      &lt;resultMap id="adminResultMap" type="com.cooldrinker.mybatis.model.Admin"&gt;
          &lt;result property="firstName" column="first_name" /&gt;
          &lt;result property="username" column="last_name"/&gt;
          &lt;result property="password" column="password"/&gt;
          &lt;result property="username" column="username"/&gt;
      &lt;/resultMap&gt;
  &lt;/mapper&gt;
  </code></pre>
  
  <p>stack trace</p>
  
  <pre><code>org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.cooldrinker.mybatis.mapper.AdminMapper.getAdminByUsername
      org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:973)
      org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
      org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
      org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
  
  root cause
  
  java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.cooldrinker.mybatis.mapper.AdminMapper.getAdminByUsername
      org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:672)
      org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:507)
      org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:500)
      org.apache.ibatis.binding.MapperMethod.setupCommandType(MapperMethod.java:240)
      org.apache.ibatis.binding.MapperMethod.&lt;init&gt;(MapperMethod.java:71)
      org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:39)
      com.sun.proxy.$Proxy38.getAdminByUsername(Unknown Source)
      com.cooldrinker.mybatis.dao.impl.AdminDaoImpl.getAdminByUsername(AdminDaoImpl.java:24)
      com.cooldrinker.dataservice.service.impl.AdminServiceImpl.getAdminByUsername(AdminServiceImpl.java:26)
      sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
      sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      java.lang.reflect.Method.invoke(Method.java:606)
      org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
      org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
      org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
      org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
      org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
      org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
      com.sun.proxy.$Proxy42.getAdminByUsername(Unknown Source)
      com.cooldrinker.controller.AdminLoginController.login(AdminLoginController.java:39)
      sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
      sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      java.lang.reflect.Method.invoke(Method.java:606)
      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:749)
      org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:690)
      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:961)
      org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
      org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
      org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
  </code></pre>