Parameter 'username' not found. Available parameters are [0, 1, param1, param2]

Type Exception Report

Message Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.binding.BindingException: Parameter 'username' not found. Available parameters are [0, 1, param1, param2]

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.binding.BindingException: Parameter '2' not found. Available parameters are [0, 1, param1, param2]
	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:661)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)

Root Cause

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.binding.BindingException: Parameter 'username' not found. Available parameters are [0, 1, param1, param2]
	org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:75)
	org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:371)
	com.sun.proxy.$Proxy13.selectOne(Unknown Source)
	org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:163)
	org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:69)
	org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)
	com.sun.proxy.$Proxy14.select(Unknown Source)
	cn.edu.cdu.service.impl.UserServiceImpl.Login(UserServiceImpl.java:20)
	cn.edu.cdu.controller.UserController.Login(UserController.java:32)
	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:215)
	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:661)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)

Root Cause

org.apache.ibatis.binding.BindingException: Parameter 'username' not found. Available parameters are [0, 1, param1, param2]
	org.apache.ibatis.binding.MapperMethod$ParamMap.get(MapperMethod.java:168)
	org.apache.ibatis.reflection.wrapper.MapWrapper.get(MapWrapper.java:45)
	org.apache.ibatis.reflection.MetaObject.getValue(MetaObject.java:122)
	org.apache.ibatis.executor.BaseExecutor.createCacheKey(BaseExecutor.java:212)
	org.apache.ibatis.executor.CachingExecutor.createCacheKey(CachingExecutor.java:139)
	org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:81)
	org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:120)
	org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:113)
	org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:73)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	java.lang.reflect.Method.invoke(Method.java:498)
	org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:358)
	com.sun.proxy.$Proxy13.selectOne(Unknown Source)
	org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:163)
	org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:69)
	org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)
	com.sun.proxy.$Proxy14.select(Unknown Source)
	cn.edu.cdu.service.impl.UserServiceImpl.Login(UserServiceImpl.java:20)
	cn.edu.cdu.controller.UserController.Login(UserController.java:32)
	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:215)
	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:661)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)

所用的是SpringMVC+Spring+Mybatis三大框架整合，数据库是mysql。

改之前的代码：

	Controller层的代码：

public class UserController {
    @Autowired
    public UserServiceImpl userService;
    @RequestMapping(method=RequestMethod.POST,value="/login")
     public String login(@RequestParam("username")String username,@RequestParam("password")String password){
        login login=userService.login(username, password);

	mapper的代码：

<select id="login"  resultMap="BaseResultMap">
        select * from login where name=#{name,jdbcType=VARCHAR} and password=#{password,jdbcType=VARCHAR}
     select>
 mapper>

问题所在：controller中的方法参数与mapper.xml中的参数类型不对应，将controller中的方法参数写成对象的形式，将各种参数赋给该对象进行传递。

改之后的

	Controller层的代码：

public String login(@RequestParam("username")String username,@RequestParam("password")String password){
    login l=new login ();
    l.setUsername(username);
    l.setPassword(password);
    login login =userService.login(l);

	或者，改mapper的代码：

<select id="login"  resultMap="BaseResultMap">
        select * from login where name=#{0} and password=#{1}
     select>
 mapper>

或者修改dao层的方法:
public Login login(@param("username")String username,@param("password")String password);