Mybatis中使用foreach标签出现的错误

public List<Employee> getEmpsByConditionForeach(List<Integer> ids);

<select id="getEmpsByConditionForeach" resultType="com.fenga.mybatis.bean.Employee">
        select * from tbl_employee
         <!--
             collection：指定要遍历的集合：
                 list类型的参数会特殊处理封装在map中，map的key就叫list
             item：将当前遍历出的元素赋值给指定的变量
             separator:每个元素之间的分隔符
             open：遍历出所有结果拼接一个开始的字符
             close:遍历出所有结果拼接一个结束的字符
             index:索引。遍历list的时候是index就是索引，item就是当前值
                           遍历map的时候index表示的就是map的key，item就是map的值
             
             #{变量名}就能取出变量的值也就是当前遍历出的元素
           -->
         <foreach collection="ids" item="item_id" separator=","
             open="where id in(" close=")">
             #{item_id}
         </foreach>
    </select>

@Test
    public void test1() throws IOException {
        SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
        SqlSession openSession = sqlSessionFactory.openSession();
        
        try {
            EmployeeMapperDynamicSQL mapper = openSession.getMapper(EmployeeMapperDynamicSQL.class);
            
            List<Employee> list = mapper.getEmpsByConditionForeach(Arrays.asList(1,2,3));
            for (Employee emp : list) {
                System.out.println(emp);
            }
            
        }finally {
            openSession.close();
        }
        
    }

public List<Employee> getEmpsByConditionForeach(@Param("ids")List<Integer> ids);