mybatis sqlmap中property遇到的问题

<select id="selectRoleList" resultClass="role" parameterClass="roleVO" >
select * from t_role where 1=1
<isNotEmpty prepend="and" property="roleId">
id=#roleId#
</isNotEmpty>
<isNotEmpty prepend="and" property="orgId">
orgId=#orgId#
</isNotEmpty>
</select>

以上里面有parameterClass是自定义的一个类其中有属性roleId、orgId等

<select id="selectProductkey" parameterClass="java.lang.String" resultClass="com.arcsoft.web.adminconsolews.model.caas.ProductKeyManage">
SELECT pkid,productkey,productSecret,`status`,softwareId,appMajorInformation,
appMajorInformation,oemInformation,generateTime,deadlineTime,iosP12Pwd,
iosP12IsSdbx,p12ExpirationTime,androidApiKey,moduleIdForPurchase,realModuleId
from oauth_product_key where 1=1
<isNotEmpty prepend="and">
productkey=#productKey#
</isNotEmpty>
</select>

而这个里面parameterClass是String，没有什么属性，故而isNotEmpty中没有property属性，也应该加property属性，否则会报错。