Nested dataTable bug?

Question

I�m having a problem with nested dataTables. The complete source code is attached.
My backing bean has properties keys and map. Keys is an array of strings. Map is a map keyed off keys with string array values.
The faces jsp creates a table with one row per key. The key is displayed in the first column and the second column holds another table displaying the elements of the corresponding map entry.
Various command links with nested <f:param> elements are in the cells and footers of the nested table. The parameter values reference the var property of either the inner or outer tables. All command links reference the same action listener which prints the value of the parameter to stdout.
Clicking on outer var always works.
Clicking on inner var yields the correct result only if you are in the last row of the outer table.
Clicking once on any of the footer link command links causes the action listener to be invoked once for each row of the outer table.
Have I found a bug, am I doing something wrong, or is this functionality not supported?
Any help appreciated.
Nick
Backing Bean Source:
package test;
import java.util.*;
import javax.faces.component.UIParameter;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
public class NestedTableBean {
     private Map map;
     private String[] keys;
     public NestedTableBean() {
          keys = new String[]{"1", "2", "3"};
          map = new HashMap();
          map.put(keys[0], new String[]{"1a", "1b", "1c"});
          map.put(keys[1], new String[]{"2a", "2b", "2c"});
          map.put(keys[2], new String[]{"3a", "3b", "3c"});
     public Map getMap() {
          return map;
     public String[] getKeys() {
          return keys;
     public void doIt(ActionEvent actionEvent) {
          String param = null;
         List children = actionEvent.getComponent().getChildren();
         for (int i = 0; i < children.size(); i++) {
           if (children.get(i) instanceof UIParameter) {
             UIParameter currentParam = (UIParameter) children.get(i);
             if (currentParam.getName().equals("param") &&
                 currentParam.getValue() != null) {
               param = currentParam.getValue().toString();
               break;
         FacesContext context = FacesContext.getCurrentInstance();
         String id = actionEvent.getComponent().getClientId(context);
         System.out.println("In doIt(), component id: "+id+", param: "+param);
}Faces JSP Source:
<h:dataTable border="2" value="#{nestedTable.keys}" var="outerVar">
<h:column>
  <h:outputText value="#{outerVar}"/>
</h:column>
<h:column>
  <h:dataTable  border="1" value="#{nestedTable.map[outerVar]}" var="innerVar">
   <h:column>
    <h:panelGrid columns="3">
     <h:outputText value="#{innerVar}"/>
     <h:commandLink actionListener="#{nestedTable.doIt}">
      <h:outputText value="outerVar"/>
      <f:param name="param" value="#{outerVar}"/>
     </h:commandLink>
     <h:commandLink actionListener="#{nestedTable.doIt}">
      <h:outputText value="innerVar"/>
      <f:param name="param" value="#{innerVar}"/>
     </h:commandLink>
    </h:panelGrid>
   </h:column>
   <f:facet name="footer">
    <h:panelGrid columns="2">
     <h:commandLink actionListener="#{nestedTable.doIt}">
      <h:outputText value="footer link"/>
      <f:param name="param" value="#{outerVar}"/>
     </h:commandLink>
    </h:panelGrid>
   </f:facet>
  </h:dataTable>
</h:column>
</h:dataTable>

Answer 1

Hello,
I have the same problem, when I use an nested dataTable the ActionEvent of the Second dataTable get always the Last Row of the First dataTable.
The complete code :
-=-=-=-=-=-=-=-=-=-=-=-=- PAGE.JSP -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
<h:dataTable id="categorias" var="categoria" value="#{UserBean.allCategorias}">
    <h:column>
        <h:dataTable id="items" var="item" value="#{categoria.items}">
           <f:facet name="header">
               <h:outputText value="#{categoria.nome}" />
           </f:facet>
           <h:column>
               <f:facet name="header">
                   <h:outputText value="Item" />
               </f:facet>
               <h:outputText value="#{item.nome}" />
           </h:column>
           <h:column>
               <f:facet name="header">
                   <h:outputText value="Qtd Solicitada" />
               </f:facet>
                <h:outputText value="#{item.qtdSolicitada}" />
            </h:column>
        <h:column>
            <f:facet name="header">
                <h:outputText value="Qtd Recebida" />
            </f:facet>
            <h:outputText value="#{item.qtdEfetivada}" />
         </h:column>
          <h:column>
              <h:panelGrid columns="2">
                  <h:inputText id="selected" size="5" />
                  <h:commandButton id="confirmar" immediate="true" image="images/confirmar_1.gif" actionListener="#{UserBean.processAction}">
                      <f:param id="itemId" name="id" value="#{item.nome}" />
                  </h:commandButton>
              </h:panelGrid>
         </h:column>
     </h:dataTable>
</h:column>
</h:dataTable>-=-=-=-=-=-=-=-=-=-=-=-=- UserBean.java -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
public void processAction(ActionEvent event) throws AbortProcessingException {
    /* Find the UIParameter component by expression */
   UIParameter component = (UIParameter) event.getComponent().findComponent("itemId");
   /* param itemId - Wrong (use Debug to see) */
}