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JSF と Primesfaces に問題があります。次のようなリストを含むフォームがあります。

<h:form>
  <h:outputText value="Filtrer par client" for="filtreClient" />
  <p:selectOneMenu id="filtreClient" value="#{actionBean.action.codeClient}" effect="fade">
    <f:selectItem itemLabel="Sélectionnez" itemValue="" />
    <f:selectItems value="#{clientDao.listeClient}"  />
  </p:selectOneMenu>
</h:form>

これを返しますerror ==>SEVERE: javax.faces.FacesException: Erreur d’argument : le paramètre «text» est null.（これは、パラメータ「テキスト」がnullであることを意味します）。私が理解していないのは、アプリケーションにパラメーターテキストがなく、どのパラメーターですか? メソッドからのパラメータ？からhttpRequest？

そのようなエラーを見たことがありますか？

ここに私のスタックトレースがあります:

SEVERE: javax.faces.FacesException: Erreur d’argument : le paramètre «text» est null.
  javax.faces.FacesException: Erreur d’argument : le paramètre «text» est null.
  at com.sun.faces.context.ExceptionHandlerImpl.handle(ExceptionHandlerImpl.java:142)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:119)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1542)
at org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:809)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:671)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:505)
at org.apache.catalina.core.ApplicationDispatcher.doDispatch(ApplicationDispatcher.java:476)
at org.apache.catalina.core.ApplicationDispatcher.dispatch(ApplicationDispatcher.java:355)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:305)
at servlet.Login.doPost(Login.java:85)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1542)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:746)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1045)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:228)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.NullPointerException: Erreur d’argument : le paramètre «text» est null.
at com.sun.faces.renderkit.html_basic.HtmlResponseWriter.writeText(HtmlResponseWriter.java:877)
at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeOption(SelectOneMenuRenderer.java:368)
at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeSelectItems(SelectOneMenuRenderer.java:333)
at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeInput(SelectOneMenuRenderer.java:114)
at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeMarkup(SelectOneMenuRenderer.java:91)
at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeEnd(SelectOneMenuRenderer.java:65)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1764)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1757)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
... 36 more

更新：ClientDaoリストを作成するのは次のとおりです。

public class ClientDao implements IClient, Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1951697664353493098L;

    public static String GET_ALL_CLIENT = "SELECT c.codeClient, c.nom , c.prenom FROM Client c ORDER BY c.name ASC ";


    @PersistenceContext(unitName = "dev")
    EntityManager em;

    private List<SelectItem> listeClient;
    private List<Client> resListeClient;
    private SelectItem selectItem;
    public List<SelectItem> getListeClient() {
        try {

            EntityManagerFactory emf = null;
            emf = Persistence.createEntityManagerFactory("dev");
            em = emf.createEntityManager();
            Query requete = em.createQuery("SELECT c FROM Client c ORDER BY c.nom ASC");
            resListeClient = requete.getResultList();
            listeClient = new ArrayList<SelectItem>();
                for (Client c : resListeClient) {
                    if (c.getNom() != null) {
                        selectItem = new SelectItem();
                        selectItem.setValue(c.getCodeClient());
                        selectItem.setLabel(c.getNom() + " " + c.getPrenom());
                        listeClient.add(selectItem);
                    }
                }

        } catch (NoResultException e) {

            System.out.println("Aucun client trouvé" + e.getMessage()
                    + e.getCause());

        } finally {
            if (em != null) {
                em.close();
            }
        }

        return listeClient;
        // return null;

    }
4

1 に答える 1

0

SelectItem具体的な問題は、getter メソッドで間違ったオブジェクトのリストを生成していることです。メソッドでリストを生成するためのコードを移行@PostConstructし、getter でそのリストを返すだけです。

@PostConstruct
public void init() {
  try {
    EntityManagerFactory emf = null;
    emf = Persistence.createEntityManagerFactory("dev");
    em = emf.createEntityManager();
    Query requete = em.createQuery("SELECT c FROM Client c ORDER BY c.nom ASC");
    resListeClient = requete.getResultList();
    listeClient = new ArrayList<SelectItem>();
        for (Client c : resListeClient) {
            if (c.getNom() != null) {
                selectItem = new SelectItem();
                selectItem.setValue(c.getCodeClient());
                selectItem.setLabel(c.getNom() + " " + c.getPrenom());
                listeClient.add(selectItem);
            }
        }

  } catch (NoResultException e) {

    System.out.println("Aucun client trouvé" + e.getMessage()
            + e.getCause());

  } finally {
    if (em != null) {
        em.close();
    }
  }
}

public List<SelectItem> getListeClient() {
  return listeClient;
}

Getter は JSF ライフサイクル中に複数回呼び出されるため、これはパフォーマンスの点でまず問題です。また、値を適切に設定するには、最初のリクエストとポストバック中に同じリストが必要です。

于 2013-03-27T14:45:12.690 に答える