Question

我正在尝试根据演示中给出的示例来上传Primefaces 3.0的组件。我还添加了commons-fileupload-1.2.2.jar和commons-io-2.0.1.jar以及primefaces-3.1.jar文件。

我运行上传器我得到一个java.lang.NullPointerException任何人都可以帮我解决这个问题，我已经广泛搜索了互联网，找不到有效的解决方案。

我正在使用NetBeans 7.2.1和GlassFish进行部署。

我的代码： XHTML：

<h:form id="frm" enctype="multipart/form-data">  
        <table>
            <tr><td><div style="height:300px;"><img src="images/adcar.jpg" style="top:0px;"/>
                    </div>
                    </td>
                <td>
                    <h:form id="img" enctype="multipart/form-data">
 <div style=" -moz-border-radius:15px;  border:1px solid;  width:600px; border-color:#930303;">
    <br></br>
        <p:panel style="border:none;">
         <p:messages></p:messages>
        </p:panel>
        <h:panelGrid columns="2">
           <h:outputText value="Nom Projet :"/>
           <h:inputText id="Nom" value="#{ajoutprjt.nomProjet}" />
           <h:outputText value="Ref Projet :"></h:outputText><h:inputText value="#{ajoutprjt.idProjet}" />
           <h:outputText value="Date de Début :"></h:outputText><h:inputText value="#{ajoutprjt.dateDeb}" />
           <h:outputText value="Date de Fin :"></h:outputText><h:inputText value="#{ajoutprjt.dateFin}" />
           <h:outputText value="Chef  :"></h:outputText>
           <h:selectOneMenu value="#{ajoutprjt.idChef}">
               <f:selectItem itemValue="#{null}" itemLabel="-- select one --" />
               <f:selectItems value="#{ajoutprjt.tdata}" var="cmd" 
                                             itemValue="#{cmd.id}" itemLabel="#{cmd.id} #{cmd.nom} #{cmd.prenom}" />
           </h:selectOneMenu>
           Documents : <p:fileUpload value="#{ajoutprjt.file}" id="fileupload"   mode="simple"></p:fileUpload>
           <h:outputText></h:outputText><p:panel style="border: none;"><p:commandButton value="Ajouter" action="#{ajoutprjt.ajoutP}" ajax="false"></p:commandButton><p:commandButton value="Annuler" action="#{ajoutprjt.annuleraj}" ajax="false"></p:commandButton></p:panel>
       </h:panelGrid>
         </div>
                    </h:form>
     </td></tr>  </table>
        </h:form>[/code]

我的豆子：

package beans;

import com.persistence.Compte;
import com.persistence.Projets;
import com.persistence.geoUtil;
import java.io.File;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.context.FacesContext;
import javax.faces.model.DataModel;
import javax.faces.model.ListDataModel;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.primefaces.model.UploadedFile;
/**
 *
 * @author  SA
 */
@ManagedBean
@RequestScoped
public class ajoutprjt implements Serializable{

     private String idpro;
     private String IdProjet;
     private String NomProjet;
     private String DateDeb;
     private String DateFin;
     private String nomimg;
     private UploadedFile file;  
     private String IdChef;
     private DataModel<Compte> tdata ;

       public ajoutprjt(){

                        }
      // getters et Setters 

    ...

    public UploadedFile getFile() {
        System.out.println("Je suis sous GetFile: " );
        return file;
    }

    public void setFile(UploadedFile file) {
        System.out.println("je Suis Sous SetFile : ");
        this.file = file;
    }


  public void ajoutP(){
    //  String p=Integer.toString(puis);
     System.out.println("Ajout Projet de ref : " +IdProjet);
     System.out.println("Ajout Projet de Idchef est  : " +IdChef);
     System.out.println("file a ajouter e  : " +this.getFile().getSize());
     if(IdProjet.equals("")==false && NomProjet.equals("")==false  && DateDeb.equals("")==false && DateFin.equals("")==false && IdChef.equals("")==false){

           try{
        Session se=geoUtil.getSessionFactory().getCurrentSession();
        Transaction tr=se.beginTransaction();
        Query q = se.createQuery("SELECT p from Projets p where IdProjet = :rf");
           q.setParameter("rf", IdProjet);     
           List<Object[]> list = (List<Object[]>) q.list();
           if(list.size() == 0){

         Projets p =new Projets();

         p.setNomProjet(NomProjet);
         p.setIdProjet(IdProjet);
         p.setDateDeb(DateDeb);
         p.setDateFin(DateFin);
         p.setIdChef(IdChef);
         // UploadedFile file = event.getFile();
          if(this.getFile()!= null) {  
                 String fileName = file.getFileName();
                 byte[] fileBytes = file.getContents();
                 p.setNomimg(fileName);
                 p.setImg(fileBytes);}
             else{
                      p.setNomimg("Pas de fichier");
                      String s = "a";
                      byte[] a = s.getBytes();      
                      p.setImg(a); 
                         }  
            se.persist(p);
            tr.commit();

         context.addMessage(null,new FacesMessage(FacesMessage.SEVERITY_INFO,"Projet ajouté avec succes","Compte chef ajouté avec succes"));
     this.setNomProjet("");
         this.setIdProjet("");
         this.setDateDeb("");
         this.setDateFin("");
         this.setIdChef("");

           }else{
               context.addMessage(null,new FacesMessage(FacesMessage.SEVERITY_ERROR,"Attention:Projet déjas existe","Attention"));
           }
           }
           catch(Exception e1){
               e1.printStackTrace();
       context.addMessage(null,new FacesMessage(FacesMessage.SEVERITY_ERROR,"Attention:Erreur d'insertion","Attention"));
           }
          }
       else{
         context.addMessage(null,new FacesMessage(FacesMessage.SEVERITY_WARN,"Attention Tous les champs doivent etre  remplis!!","Attention"));
       }

   }
}

这是我的web.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" 
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <param-value>Development</param-value>
    </context-param>
    <context-param>
        <param-name>primefaces.THEME</param-name>
        <param-value>aristo</param-value>
    </context-param>
    <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.xhtml</url-pattern>
        <url-pattern>/faces/*</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>faces/auth.xhtml</welcome-file>
    </welcome-file-list>
    <resource-ref>
        <description>Base de données pour app Ontologie
Projet master Pro</description>
        <res-ref-name>jdbc/gcn</res-ref-name>
        <res-type>javax.sql.DataSource</res-type>
        <res-auth>Container</res-auth>
        <res-sharing-scope>Shareable</res-sharing-scope>
    </resource-ref>
        <filter>
         <filter-name>PrimeFaces FileUpload Filter</filter-name>
        <filter-class>
                org.primefaces.webapp.filter.FileUploadFilter
         </filter-class>
        </filter>
        <filter-mapping>
            <filter-name>PrimeFaces FileUpload Filter</filter-name>
             <servlet-name>Faces Servlet</servlet-name>
                 <dispatcher>FORWARD</dispatcher>
        </filter-mapping>
</web-app>

非常感谢任何帮助。这是堆栈跟踪：

javax.faces.el.EvaluationException: java.lang.NullPointerException
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
    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$AdapterCallable.call(ContainerMapper.java:317)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.NullPointerException
    at beans.ajoutprjt.ajoutP(ajoutprjt.java:176)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at com.sun.el.parser.AstValue.invoke(AstValue.java:254)
    at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:302)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
    ... 32 more

Answer 1

我不明白如何在“actionListener”上使用此方法“ajoutP”，如“actionListener =”＃{ajoutprjt.ajoutP}“，以便在方法”ajoutP（FileUploadEvent event）“中有一个参数。生成以下错误«javax.el.MethodNotFoundException»

Answer 2

你似乎在那个页面上有很多东西。以下是我将如何进行调试：

如果您还没有这样做，请下载所有依赖项（如果您这样做，请仔细检查您的工作）。这是依赖项的link/source

enter image description here

使用PrimeFace网站上的这个示例，只需创建一个单独的 fileuploadController和查看页面，就像他们在此link
尝试让上面的步骤先工作，一旦你有了工作，然后开始慢慢地将这些元素添加到你现有的当前JSF页面和控制器，并改变以适应你的要求（从头开始，而不是你的内容）已经修改并发布在此页面上。）

我注意到了一件事：

我看到你嵌套了enctype =“multipart / form-data”这可能是导致null的一个因素是你在一个页面中有太多这些并且你的控制器只获得其中一个但是这只是在完成我上面列出的所有麻烦/步骤之前，你可能想要调试和研究一个有根据的观察。

Answer 3

在xhtml页面中使用actionListener代替action

<p:commandButton value="Ajouter" actionListener="#{ajoutprjt.ajoutP}"
 ajax="false"></p:commandButton>

将ManagedBean ajoutP()方法更改为

public void ajoutP(FileUploadEvent event){

        OutputStream out=null;
        InputStream fileContent=null;
        try{
            UploadedFile uploadedFile= event.getFile();
            out= new FileOutputStream(new 
                           File("D:/")+uploadedFile.getFileName());
            fileContent= uploadedFile.getInputstream();
            int read=0;
            final byte[] bytes= new byte[1024];
            while((read= fileContent.read(bytes))!=-1){
               out.write(bytes,0,read); 
            }
        }
        catch(FileNotFoundException fnfe){

        }
        catch(IOException ioex){

        }
}

UploadedFile - NullPointerException

3 个答案: