ssm项目中报Invalid bound statement (not found)错误？？？

这是异常

nested exception is org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.prs.dps.dao.IPoetDao.getPoetById

PoetMapper.xml

<?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">
<mapper namespace="com.prs.dps.dao.IPoetDao" >

    <resultMap id="userResultMap" type="poet">
        <id property="id" column="user_id" />
        <result property="username" column="username"/>
        <result property="password" column="password"/>
        <result property="fullName" column="fullName"/>
        <result property="email" column="email"/>
        <result property="updateByEmail" column="updateByEmail"/>
    </resultMap>


    <select id="getPoetById" resultMap="userResultMap">
        select from poet where id = #{id}
    </select>
</mapper>

IPoetDao

package com.prs.dps.dao;

import com.prs.dps.domain.Poet;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * Created by ffulauh on 2016/6/4.
 */
@Repository("poetDao")
public interface IPoetDao {
    List<Poet> getPoetById(Integer id) throws Exception;
}

mybatis配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost:3306/dps?useUnicode=true&amp;characterEncoding=utf8" />
        <property name="username" value="root" />
        <property name="password" value="02041992" />
        <property name="initialSize" value="0" />
        <property name="maxActive" value="20" />
        <property name="maxIdle" value="20" />
        <property name="minIdle" value="0"/>
        <property name="maxWait" value="10000" />
    </bean>

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="mapperLocations" value="classpath*:com/prs/dps/mapper/*Mapper.xml" />
        <property name="configLocation" value="/WEB-INF/config/mybatis/mybatis-configuration.xml"/>
    </bean>

    <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg ref="sqlSessionFactory"></constructor-arg>
    </bean>
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.prs.dps.dao"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
    </bean>

</beans>

mybatis-configuration.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <typeAliases>
        <!--portal-->
        <typeAlias type="com.prs.dps.domain.Poet" alias="poet"></typeAlias>
    </typeAliases>
</configuration>