List<GoodsDTO> list = session.selectList("goods.selectGoodsDTO");有一行报错

package com.imooc.mybatis;

import com.imooc.mybatis.dto.GoodsDTO;
import com.imooc.mybatis.entity.Goods;
import com.imooc.mybatis.utils.MyBatisUtils;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import java.io.IOException;
import java.io.Reader;
import java.sql.Connection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class MybatisTestor {
    @Test
    public  void testSqlSessionFactory() throws IOException {
        Reader reader=Resources.getResourceAsReader("mybatis-config.xml");
        SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(reader);
        System.out.println("SessionFactory加载成功");
        SqlSession sqlSession=null;
        try {
             sqlSession=sqlSessionFactory.openSession();
            Connection connection=sqlSession.getConnection();
            System.out.println(connection);
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            if (sqlSession!=null){
                sqlSession.close();
            }
        }
    }
    @Test
    public  void testMyBatisUtils(){
        SqlSession sqlSession =null;
        try {
            sqlSession= MyBatisUtils.openSession();
            Connection connection = sqlSession.getConnection();
            System.out.println(connection);
        }catch (Exception e){
            throw e;
        }finally {
            MyBatisUtils.closeSession(sqlSession);
        }
    }
    @Test
    public void testSelectAll(){
        SqlSession session=null;
        try {
            session= MyBatisUtils.openSession();
            List<Goods> list=session.selectList("goods.selectAll");
            for (Goods g:list){
                System.out.println(g.getTitle());
            }
        }catch (Exception e){
            throw e;
        }finally {
            MyBatisUtils.closeSession(session);
        }
    }
    @Test
    public  void testSelectById() throws Exception{
        SqlSession session=null;
        try {
            session= MyBatisUtils.openSession();
            Goods goods=session.selectOne("goods.selectById" , 1602);
            System.out.println(goods.getTitle());
        }catch (Exception e){
            throw e;
        }finally {
            MyBatisUtils.closeSession(session);
        }
    }

    @Test
    public void testSelectByPriceRange() throws Exception{
        SqlSession session=null;
        Map param=new HashMap<>();
        param.put("min",100);
        param.put("max",500);
        param.put("limt",10);
        try {
            session= MyBatisUtils.openSession();
            List<Goods> list=session.selectList("selectByPriceRange",param);
            for (Goods g:list) {
                System.out.println(g.getTitle()+":"+g.getCurrentPrice());
            }
        }catch (Exception e){
            throw e;
        }finally {
            MyBatisUtils.closeSession(session);
        }
    }

    @Test
    public void testSelectGoodsMap() throws Exception{
        SqlSession session=null;
        try {
            session= MyBatisUtils.openSession();
            List<Map> list=session.selectList("goods.selectGoodsMap");
            for (Map map:list){
                System.out.println(map);
            }
        }catch (Exception e){
            throw e;
        }finally {
            MyBatisUtils.closeSession(session);
        }
    }

    @Test
    public void testSelectGoodsDTO(){
        SqlSession session=null;
        try {
            session= MyBatisUtils.openSession();
            List<GoodsDTO> list = session.selectList("goods.selectGoodsDTO");
            for (GoodsDTO g:list){
                System.out.println(g.getGoods().getTitle());
            }
        }catch (Exception e){
            throw e;
        }finally {
            MyBatisUtils.closeSession(session);
        }
    }

}

同学你好，如上面回答，建议同学一并提供报错信息。

祝学习愉快~

<?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="goods">
   <select id="selectAll" resultType="com.imooc.mybatis.entity.Goods">
       select * from t_goods order by goods_id desc limit 10
   </select>

   <select id="selectById" parameterType="Integer" resultType="com.imooc.mybatis.entity.Goods">
       select * from t_goods where goods_id=#{value}
   </select>

   <select id="selectByPriceRange" parameterType="java.util.Map" resultType="com.imooc.mybatis.entity.Goods">
       select * from t_goods
       where
          current_price between #{min} and #{max}
       order by current_price
       limit 0,#{limt}
   </select>

   <select id="selectGoodsMap" resultType="java.util.LinkedHashMap">
       select g.*,c.category_name from t_goods g,t_category c
       where g.category_id=c.category_id
   </select>

   <resultMap id="rmGoods" type="com.imooc.mybatis.dto.GoodsDTO">
       <id property="goods.goodsId" column="goods_id"></id>
       <result property="goods.title" column="title"></result>
       <result property="goods.originalCost" column="original_cost"></result>
       <result property="goods.currentPrice" column="current_price"></result>
       <result property="goods.discount" column="discount"></result>
       <result property="goods.isFreeDelivery" column="is_free_delivery"></result>
       <result property="test" column="test"></result>
       <result property="category.categoryId" column="category_id"></result>
       <result property="category.categoryName" column="category_name"></result>
       <result property="category.parentId" column="parent_id"></result>
       <result property="category.categoryLevel" column="category_level"></result>
       <result property="category.categoryOrder" column="category_order"></result>
   </resultMap>
   <select id="selectGoodsDTO" resultMap="rmGoods">
       select g.*,c.*,'1' as test from t_goods g,t_category c
       where g.category_id=c.category_id
   </select>

</mapper>