logic:iterate & JspException

[TOMMY]

Dear All I've got a question and seeking for answers. does anyone know what's wrong in the following code.       tommySelectForm -------------------------------------------------------------------------------------     public Collection getUse_list(){              ArrayList aa=new ArrayList();      aa.add("AAA");      aa.add("BBB");      aa.add("CCC");           return  aa;    }       tommy_Select.jsp -------------------------------------------------------------------------------------    <logic:iterate id="ddd" name="tommySelectForm" property="use_list">  <TH>       <A HREF="http://www.kimo.com.tw" ><bean:write name="ddd" /></A></br>  </TH>  </logic:iterate>     struts-config.xml -------------------------------------------------------------------------------------       <action    path="/tommy_select"                type="tw.com.bct.online.tommy.TommySelectAction"                name="tommySelectForm"                scope="request"                >                <forward   name="success"              path="/tommy_Select.jsp"/>     </action>     Exception ------------------------------------------------------------------------------------- Root cause of ServletException javax.servlet.jsp.JspException: Cannot find bean ddd in scope null     Thanks Tommy