people or people.{name} org.apache.jasper.JasperException s:select使用

org.apache.jasper.JasperException: tag 'select', field 'list', name 'productList': The requested list key 'selectListProduct' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location]

##Action.java

private List<Map<String, String>> selectListProduct;
//产品-下拉列表

##.jsp

<s:select name="productList" list="selectListProduct" listKey="id" listValue="name">

</s:select>

出现如上错误

解决：原来是set、get没有提供。如果提供了肯定是，修改了属性名称，从而导致问题出现。