0
問題是，當我使用我的命令按鈕，我有一個NPE，我不知道爲什麼有一些代碼和異常stacktrace我希望你會幫助，因爲我有花一天時間，仍然不知道爲什麼（primefaces 4.0）JSF 2.1.6空指針異常，而調用bean方法（PrimesFaces）
javax.faces.el.EvaluationException: javax.el.ELException: /test.xhtml at line 54 and column 113 action="#{messageBean.save}": java.lang.NullPointerException
at javax.faces.component._MethodExpressionToMethodBinding.invoke(_MethodExpressionToMethodBinding.java:96)
at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:100)
at javax.faces.component.UICommand.broadcast(UICommand.java:120)
at javax.faces.component.UIViewRoot._broadcastAll(UIViewRoot.java:937)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:271)
at javax.faces.component.UIViewRoot._process(UIViewRoot.java:1249)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:675)
at org.apache.myfaces.lifecycle.InvokeApplicationExecutor.execute(InvokeApplicationExecutor.java:34)
at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:171)
at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:189)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:315)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: javax.el.ELException: /test.xhtml at line 54 and column 113 action="#{messageBean.save}": java.lang.NullPointerException
at org.apache.myfaces.view.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:95)
at javax.faces.component._MethodExpressionToMethodBinding.invoke(_MethodExpressionToMethodBinding.java:88)
... 29 more
Caused by: java.lang.NullPointerException
at ma.corporate.bean.MessageBean.save(MessageBean.java:60)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.el.parser.AstValue.invoke(AstValue.java:278)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:273)
at org.apache.myfaces.view.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:83)
... 30 more
我的頁面
<!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:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui">
<h:head></h:head>
<h:body>
<p:panel header="Contactez Nous">
<p:growl id="message" showDetail="true"/>
<h:form id="form">
<p:panelGrid style="width:700px;" styleClass="contactcss"
columns="2">
<p:inputText value="#{messageBean.message.nomComplet}" style="width:600px" id="nom" required="true"
requiredMessage="Champs Obligatoire">
<p:watermark for="nom" value="Nom" />
</p:inputText>
<p:message for="nom" display="both" />
<p:inputText style="width:600px" value="#{messageBean.message.email}" id="email" required="true"
requiredMessage="Champ Obligatoire"
validatorMessage="Email Invalide">
<p:watermark for="email" value="Email" />
<f:validateRegex
pattern="^[_A-Za-z0-9-\+]+(\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\.[A-Za-z0-9]+)*(\.[A-Za-z]{2,})$" />
</p:inputText>
<p:message for="email" display="both" />
<p:inputText style="width:600px" value="#{messageBean.message.objet}" id="objet" required="true"
requiredMessage="Champ Obligatoire">
<p:watermark for="objet" value="Objet" />
</p:inputText>
<p:message for="objet" display="both" />
<p:inputMask mask="9999-999-999" style="width:600px" value="#{messageBean.message.telephone}" id="telephone">
<p:watermark for="telephone" value="téléphone" />
</p:inputMask>
<p:message for="telephone" display="both" />
<p:inputTextarea style="width:600px;height:200px" value="#{messageBean.message.textMessage}" id="message"
required="true" requiredMessage="Champ Obligatoire">
<p:watermark for="message" value="Message" />
</p:inputTextarea>
<p:message for="message" display="both" />
<p:commandButton update=":form :message" style="float:right;" action="#{messageBean.save}" value="Envoyer"></p:commandButton>
</p:panelGrid>
</h:form>
</p:panel>
</h:body>
</html>
我的豆 包ma.corporate.bean;
import java.io.Serializable;
import java.util.List;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;
import ma.corporate.facade.MessageFacade;
import ma.corporate.model.Message;
import ma.corporate.util.Email;
import ma.corporate.util.EmailSender;
import org.primefaces.context.RequestContext;
@ManagedBean(name = "messageBean")
@SessionScoped
public class MessageBean implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private MessageFacade messageFacade;
private List<Message> messages;
private Message message;
private Email email =new Email();
private String reponse;
public MessageBean() {
message = new Message();
}
public List<Message> getMessages() {
// messages = messageFacade.Lister();
messageFacade = new MessageFacade();
messages = messageFacade.Lister();
return messages;
}
public void setMessages(List<Message> messages) {
this.messages = messages;
}
public Message getMessage() {
return message;
}
public void setMessage(Message message) {
this.message = message;
}
public void save() {
System.out.println(message.getEmail());
System.out.println(message.getNomComplet());
System.out.println(message.getObjet());
System.out.println(message.getTelephone());
System.out.println(message.getTextMessage());
messageFacade.enregistrer(message);
}
public void Supprimer(Message message) {
messageFacade.supprimer(message);
messages = messageFacade.Lister();
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO,"Succès","Suppression Complète"));
}
public void init(Message message) {
this.message = message;
email.setDestinataire(message.getEmail());
email.setObjet(message.getObjet());
//email.setTexte("eljfdksjlfhdskjfsdhfkds");
RequestContext.getCurrentInstance().update(":form1:dlg3");
//System.out.println(this.message.getNomComplet());
}
public void sendEmail()
{
/*System.out.println("Send Email");
System.out.println(email.getObjet());
System.out.println(email.getTexte());
System.out.println(email.getDestinataire());*/
//FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO,"En Cours","En Cours d'envoi"));
@SuppressWarnings("unused")
EmailSender sender = new EmailSender(email);
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO,"Succès","Message Envoyé"));
//System.out.println("après emailSender");
}
public Email getEmail() {
return email;
}
public void setEmail(Email email) {
this.email = email;
}
public String getReponse() {
return reponse;
}
public void setReponse(String reponse) {
this.reponse = reponse;
}
}