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Asked: 2026-06-09T11:07:03+00:00

On a Facelets page I travel a list to display data in a p:dataTable

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On a Facelets page I travel a list to display data in a p:dataTable (a PrimeFaces component).
This list itself contains another list that I travel using a c:forEach (JSTL).

The problem is that the data for the list that c:forEach should handle does not appear. When I access a specific element it works well, but not in a c:forEach.

Is it not possible to use an inner loop variable embedded in another loop?

Here’s the page’s code:

    <?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:ui="http://java.sun.com/jsf/facelets"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:p="http://primefaces.org/ui"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:c="http://java.sun.com/jsp/jstl/core">

    <body>

        <ui:composition template="./template_utilisateur.xhtml">

            <ui:define name="content">

                <h:form prependId="false" id="form">

                    <p:growl id="growl" showDetail="true"/>

                    <p:dataTable id="carsTable" var="car" value="#{histCommController.lc}" rowKey="#{car.id}"  
                                  selectionMode="single" >

                        <f:facet name="header">
                            Expand rows to see detailed information
                        </f:facet>

                        <p:column style="width:4%">
                            <p:rowToggler/>
                        </p:column>

                        <p:column style="width:48%">
                            <f:facet name="header">
                                id
                            </f:facet>
                            <h:outputText value="#{car.id}" />
                        </p:column>

                        <p:column style="width:48%">
                            <f:facet name="header">
                                date envoi
                            </f:facet>
                            <h:outputText value="#{car.dateEnvoi}" />
                        </p:column>

                        <p:rowExpansion id="expanssion">
                            <h:panelGrid id="display" columns="2" cellpadding="4" style="width:300px;"
                                         styleClass=" ui-widget-content grid">

                                <h:outputText value="Model:" />
                            <h:outputText value="#{car.id}" />

                            <h:outputText value="Year:" />
                            <h:outputText value="#{car.etat}" />

                            <h:outputText value="Manufacturer:" />
                            <h:outputText value="#{car.dateEnvoi}" />

                            <h:outputText value="Color:" />
                            <h:outputText value="#{car.dateLivraisonRecommande}" />

                            <h:outputText value="Fichiers : " />
                            <h:outputText value="::::::::::::" />


                            <h:outputText value="Fichiers 1 : " />
                            <h:outputText value="#{car.listFichiers.get(0).nom}" />


                            <c:forEach var="jjjjj" items="#{car.listFichiers}">
                                <h:outputText value="nom fichier 1 : " />
                            <h:outputText value="#{jjjjj.nom}" />
                            </c:forEach>
                            </h:panelGrid>

                        </p:rowExpansion>
                    </p:dataTable>
                </h:form>

            </ui:define>

        </ui:composition>

    </body>
</html>
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1 Answer

  1. Editorial Team

    The problem occurs because you are mixing so-called build-time and render-time constructs.

    build-time happens first, and everything that happens there can not make use of things that don’t exist until render-time, which happens after.

    In your case, the JSTL forEach is build-time, while the car var is made available by the render-time dataTable. The solution is to use a render-time construct for the inner looping. The best candidate for this is ui:repeat.

    See also

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