title: SEVERE: javax.faces.FacesException: Erreur d’argument : le paramètre «text» est null
body: <p>I have a problem, with JSF and Primesfaces.
  I have a form with a list like the:</p>
  
  <pre><code>&lt;h:form&gt;
    &lt;h:outputText value="Filtrer par client" for="filtreClient" /&gt;
    &lt;p:selectOneMenu id="filtreClient" value="#{actionBean.action.codeClient}" effect="fade"&gt;
      &lt;f:selectItem itemLabel="Sélectionnez" itemValue="" /&gt;
      &lt;f:selectItems value="#{clientDao.listeClient}"  /&gt;
    &lt;/p:selectOneMenu&gt;
  &lt;/h:form&gt;
  </code></pre>
  
  <p>It returns me this <code>error ==&gt;SEVERE: javax.faces.FacesException: Erreur d’argument : le paramètre «text» est null.</code>(wich means that the parameter "text" is null).
  What I don't understand is that i don't have a  parameter text in my application and what parameter? Parameter from a method? from a <code>httpRequest</code>?</p>
  
  <p>Have you ever seen that kind of error?</p>
  
  <p>Here is my stack trace :</p>
  
  <pre><code>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
  </code></pre>
  
  <hr>
  
  <p><strong>Update</strong>: Here is the <code>ClientDao</code> which creates the list:</p>
  
  <pre><code>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&lt;SelectItem&gt; listeClient;
      private List&lt;Client&gt; resListeClient;
      private SelectItem selectItem;
      public List&lt;SelectItem&gt; 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&lt;SelectItem&gt;();
                  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;
  
      }
  </code></pre>