mybatis查询返回的对象不为null，但是属性值为null

<resultMap >
<id column="MU_ID" jdbcType="BIGINT" property="muId"/>
<result column="USER_ID" jdbcType="BIGINT" property="userId"/>
<result column="MERCHANT_NO" jdbcType="VARCHAR" property="merchantNo"/>
<result column="USER_PHONE" jdbcType="VARCHAR" property="userPhone"/>
<result column="GRANTED" jdbcType="VARCHAR" property="granted"/>
<result column="CREATE_DATE" jdbcType="TIMESTAMP" property="createDate"/>
<result column="MERCHANT_USER_ID" jdbcType="VARCHAR" property="merchantUserId"/>
<result column="STATUS" jdbcType="VARCHAR" property="status"/>
<result column="ENTE_USER_NO" jdbcType="VARCHAR" property="enteUserNo"></result>
</resultMap>

<sql >
MU_ID muId,
USER_ID userId,
MERCHANT_NO merchantNo,
USER_PHONE userPhone,
GRANTED granted,
CREATE_DATE createDate,
MERCHANT_USER_ID merchantUserId,
ENTE_USER_NO enteUserNo,
STATUS status
</sql>
<select >
select
<include ref/>
from merchant_user
where MU_ID = #{muId,jdbcType=BIGINT}
</select>