Result Maps collection does not contain value for XXXXX

在作mybatis多表查詢的時候，出現了下面的錯誤：

java.lang.IllegalArgumentException: Result Maps collection does not contain value for com.up.sell.mapper.system.AdvertisementMapper.areasResult
    at org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:888) ~[mybatis-3.4.6.jar:3.4.6]
    at org.apache.ibatis.session.Configuration.getResultMap(Configuration.java:640) ~[mybatis-3.4.6.jar:3.4.6]
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getNestedResultMap(DefaultResultSetHandler.java:1011) ~[mybatis-3.4.6.jar:3.4.6]
    at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.applyNestedResultMappings(DefaultResultSetHandler.java:945) ~[mybatis-3.4.6.jar:3.4.6]

意思很明確，是ResultMap映射出現了問題，下面貼上映射代碼：

    <resultMap type="Advertisement" id="AdvertisementResult">
        <id property="id" column="id" />
        <result property="title" column="title" />
        <result property="imgPath" column="img_path" />
        <result property="url" column="url" />
        <result property="description" column="description" />
        <result property="sorrt" column="sorrt" />
        <result property="place" column="place" />
        <result property="provinceId" column="province_id" />
        <result property="cityId" column="city_id" />
        <result property="advFlag" column="adv_flag" />
        <result property="createUser" column="create_user" />
        <result property="createTime" column="create_time" />
        <result property="updateUser" column="update_user" />
        <result property="updateTime" column="update_time" />
        <association property="provinceId" column="id" javaType="Areas" resultMap="areasResult"/>
    </resultMap>

個人sql代碼：

    <select id="findList" parameterType="Advertisement" resultMap="AdvertisementResult">
        SELECT
        a.id ,
        a.title ,
        a.img_path ,
        a.url ,
        a.description ,
        a.sort ,
        s.area_name ,
        s1.short_name
        FROM
        advertisement a
        LEFT JOIN areas s ON
        a.province_id = s.id LEFT JOIN areas s1 on a.city_id
        = s1.id
    </select>

我是把關聯表的resultMap忘記寫了，加上以後就行了，代碼以下：

    <resultMap id="areasResult" type="Areas">
        <id property="id" column="id" />
        <result property="areaName" column="area_name" />
        <result property="parentId" column="parent_id" />
        <result property="shortName" column="short_name" />
    </resultMap>

主表的resultMap和副表的resuleMap Id是對應的。