i found a way to solve this requirement, below is the sample code
(i've yet to polish some lines because i'm testing it)
<s:set name="myList" value="pagList" scope="request" />
<display:table name="myList" pagesize="5" id="testit">
<display:column property="pa.id" title="Id" style="" />
<display:column property="pa.appName" title="Application Name"
style="" />
<display:column property="ag.groupName" title="Application
Group" style="" />
<display:column property="pa.activeFlag" title="Status"
style="" />
<display:column title="testit_rowNum" style="">
<%=pageContext.getAttribute("testit_rowNum")%>
</display:column>
<% long aId = ((PortalAppAndAppGroup)
pageContext.getAttribute("testit")).getPa().getId(); %>
<display:column>
<a href='
<portlet:actionURL>
<portlet:param name="appId"
value='<%=Long.toString(aId)%>' />
<portlet:param name="mode"
value='editApps' />
</portlet:actionURL>'>
Edit
</a>
</display:column>
<s:url action="editPortalApp" id="editUrl2">
<s:param name="appId">
<%=Long.toString(aId)%>
</s:param>
<s:param name="mode">
<%="editApps"%>
</s:param>
</s:url>
<display:column>
<a href='<s:property value="%{editUrl2}"/>'>Edit2</a>
</display:column>
<s:url action="index" portletUrlType="action" id="editUrl3">
<s:param name="appId">
<%=Long.toString(aId)%>
</s:param>
<s:param name="mode">
<%="editApps"%>
</s:param>
</s:url>
<display:column>
<a href='<s:property value="%{editUrl3}"/>'>Edit3</a>
</display:column>
</display:table>
==================
and here's my struts.xml (i'm using struts2)
<struts>
<package name="view" extends="struts-portlet-default" namespace="/view">
<action name="index" class="action.IndexAction">
<result>/WEB-INF/jsp/view/index.jsp</result>
</action>
<action name="editPortalApp" class="com.EditPortalAppAction">
<result>/WEB-INF/jsp/view/index.jsp</result>
</action>
</package>
</struts>
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