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这不是我第一次使用primefaces的数据表，但这次行号显示正确但单元格为空

这是 page.xhtml ：

<!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:p="http://primefaces.org/ui"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core">

<h:head>
    <title>All data</title>

</h:head>

<h:body>

    <h:form>
        <p:dataTable var="client" value="#{candndiateDataComponent.allClient}">


            <p:column>
                <f:facet name="header">
                    <h:outputText value="Firstname" />
                </f:facet>
                <h:outputText value="#{client.firstname}" />
            </p:column>

            <p:column>
                <f:facet name="header">
                    <h:outputText value="LastName" />
                </f:facet>
                <h:outputText value="#{client.lastname}" />
            </p:column>

            <p:column>
                <f:facet name="header">
                    <h:outputText value="phone" />
                </f:facet>
                <h:outputText value="#{client.phone}" />
            </p:column>


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


</h:body>


</html>

这是 managedBean CandndiateDataComponent ：

@ManagedBean
@SessionScoped
public class CandndiateDataComponent implements Serializable {



    @ManagedProperty(value = "#{clientService}")
    ClientService clientService;

    List<Client> allClient;
    Client selectedClient;

    @PostConstruct
    public void init() {
        selectedClient=new Client();

    }





    public List<Client> getAllClient() {
        allClient =(List<Client>) this.clientService.getAllClient();
        return allClient;
    }

    public void setAllClient(List<Client> allClient) {
        this.allClient = allClient;
    }

    public Client getSelectedClient() {
        return selectedClient;
    }

    public void setSelectedClient(Client selectedClient) {
        this.selectedClient = selectedClient;
    }

    public ClientService getClientService() {
        return clientService;
    }

    public void setClientService(ClientService clientService) {
        this.clientService = clientService;
    } 

}
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