Displaytag attribute url (link) is not working in jboss portal 2.4.6

Code :

<ajax:displayTag id="displayTagFrame" ajaxFlag="displayAjax" >
Last Time Table Refreshed: ${now}
<display:table name="pageScope.service.allCars" class="displaytag" pagesize="10"
defaultsort="1" defaultorder="descending" export="true" id="row" excludedParams="ajax">
<display:column property="make" title="Make" sortable="true" headerClass="sortable" />
<display:column property="model" title="Model" sortable="true" headerClass="sortable" />
<display:column title="Link" media="html">
${row.make} Web Page
</display:column>
<display:column title="Link" media="excel xml">
www.${row.make}.com
</display:column>
</display:table>

</ajax:displayTag>

The link will work in tomcat but in jboss portal 2.4.6 its not working.

Please let me if anybody has the solution for this issue.

Thanks in advance.