[jboss-user] [JBoss Seam] - Using the pages.xml to pass a parameter

[fmi2]

Hi, I'm trying to understand how the pages.xml file is used to pass a parameter.
I have the following in my pages.xml file

  | <pages>
  | 	<page view-id="/centerdetail.xhtml" action="#{centerSearch.performSearch(center.centerID)}">
  | 		<param name="selectedCenter" value="#{center.centerID}"/>
  | 	</page>
  | </pages>
  | 

the code in the page that request the centerdetail.xhtml page is 

  | <h:panelGroup id="centerResultsPanel" rendered="#{basicSearch.researchCenterSearch}">
  | 		<h:dataTable  id="researchcenterResults" var="center" value="#{searchResultList}" rendered="#{searchResultList.rowCount >0}">
  | 			<h:column>
  | 					<h:outputLink>
  | 						<h:graphicImage url="images/logotype.gif"/>
  | 						<h:outputText value="#{center.centerID}"/>
  | 						<h:outputText value="#{obj.centerID}"/>
  | 					</h:outputLink>
  | 			</h:column>
  | 			<h:column>				
  | 				<h:panelGrid id="holder" >
  | 					<s:link id="centerName" view="/centerdetail.seam" action="#{centerSearch.performSearch(center)}" value="#{center.displayName}"/>											
  | 					<h:outputFormat value="#{center.description}"/>
  | 				</h:panelGrid>
  | 			</h:column>
  | 		</h:dataTable>
  | 		<h:outputText value="#{messages.zeroresults}" rendered="#{searchResultList.rowCount==0 and basicSearch.researchCenterSearch}" />
  | 	</h:panelGroup>
  | 

and this performSearch method in my centerSearch bean is as follows

  | @SuppressWarnings("unchecked")
  |     public String performSearch(ResearchCenter id) {
  |         Query query;
  |         log.debug(" Searching for center by ID ");
  |         log.debug("Center ID: #0", id);
  |        
  |         return "success";
  |     }
  | 

The center id is being appended to the url but is showing up as null in the server.log file

2006-12-21 14:29:16,468 DEBUG [gov.nih.nci.cagrid.portal.command.CenterSearchBean]  Center ID:null 

Does anyone know how to pass an object from a selected row in a datatable to a separate bean , ie my searchBean holds the following

  | @DataModel("searchResultList")
  |     protected List<? extends DomainObject> results;
  |   
  |     @DataModelSelection()
  |     protected DomainObject domainObj;
  | 

and I want to pass the object of the selected row to a centerBean.

Any suggestions would be greatly appreciated.
Thank you 

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