How to generate a pdf with Primefaces 5.3 using dataexport

Question

This is my screen to generate the pdf

<p:panel style="margin-left:30%" id="pnlTituloGabarito">
        <p:commandButton value="Export to PDF" ajax="false">
        <p:dataExporter type="pdf" target="subTableRespostas" fileName="gabaritoPDF"/>
        </p:commandButton>
        <h:outputLabel value="Instituição: "/>
        <h:outputText value="#{GabaritoRespostaControl.prova.instituicao.nomeFantasia}"/>
        <h:outputLabel style="margin-left:2.5%" value="Turma / Período: "/>
        <h:outputText value=" #{GabaritoRespostaControl.prova.periodo}"/>
        <a:newLine/>
        <h:outputLabel value="Curso: "/>
        <h:outputText value=" #{GabaritoRespostaControl.prova.curso.nome}"/>
        <h:outputLabel style="margin-left:1.5%" value="Disciplina: "/>
        <h:outputText value="#{GabaritoRespostaControl.prova.disciplina.nome}"/>
    </p:panel>
    <p:dataTable  var="listaPaginada" id="dTblRespostas" emptyMessage="Não há nenhuma questão para esta prova!" scrollable="true" scrollHeight="440" style="width:30%; margin-left:30%" value="#{GabaritoRespostaControl.gabarito.dataTableDividido }">
        <p:subTable id="subTableRespostas" value="#{listaPaginada }"  var="questao">
            <p:column headerText="Questão">
                <h:outputText value="#{questao.key }"/>
            </p:column>
            <p:column headerText="Resposta">
                <h:outputText value="#{questao.value }"/>
            </p:column>
        </p:subTable>
    </p:dataTable>

</p:panel>

Generates the following error when I click the button:

javax.servlet.Servletexception: Cannot find Component for Expression "subTableRespostas" referenced from "formCorpo:j_idt92". javax.faces.webapp.FacesServlet.service(Facesservlet.java:659) org.primefaces.webapp.filter.Fileuploadfilter.doFilter(Fileuploadfilter.java:78) org.apache.Tomcat.websocket.server.WsFilter.doFilter(Wsfilter.java:52)

Answer 1

Dear colleague,

Looking at the Primefaces documentation, this dataExport does not have a subTable within a datatable. Probably the implementation that creates the PDF can’t get the data through that component. Try to take the subTable and just leave the datatable.