Why is null returned when accessing the managedBean resource?

Question

Why is null returned when accessing the managedBean resource?

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#1 by (0 votes)

1

I'm having trouble accessing methods and attributes on a Managedbean. I'm using JSF and the Glassfish server, I've already used a similar architecture that I'm using however on a Tomcat server.

I would like to know if anyone has ever had a problem of the type and how to solve it, remembering that for reasons of confidentiality, I omitted some attribute names by putting Object in place.

Error Message:

HTTP Status 500 - Internal Server Error

type Exception report

messageInternal Server Error

descriptionThe server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: /index.xhtml @ 61,185 value="# {controller.object.name}": Target Unreachable, 'null' returned null       root cause

javax.el.PropertyNotFoundException: /index.xhtml @ 61,185 value="# {controller.object.name}": Target Unreachable, 'null' returned null       root cause

javax.el.PropertyNotFoundException: Target Unreachable, 'null' returned null       note The full stack traces of the exception and its root causes are available in the GlassFish Server Open Source Edition 4.1 logs.

GlassFish Server Open Source Edition 4.1

Website:

<!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:h="http://java.sun.com/jsf/html"
       xmlns:f="http://java.sun.com/jsf/core"
       xmlns:ui="http://java.sun.com/jsf/facelets"
       xmlns:pt="http://xmlns.jcp.org/jsf/passthrough">

<h:head>
    <meta charset="utf-8"> </meta>
    <meta http-equiv="X-UA-Compatible" content="IE=edge"> </meta>
    <meta name="viewport" content="width=device-width, initial-scale=1"> </meta>
    <link rel="icon" href="assets/img/favicon.png"> </link>
    <title>titulo</title>
    <link rel="stylesheet" type="text/css" href="assets/css/reset.css"> </link>
    <link rel="stylesheet" type="text/css" href="assets/css/styles.css"> </link>
    <link rel="stylesheet" type="text/css" href="assets/css/media.css"> </link>

    </h:head>

    <h:body>
        <div id="top">
           <div id="logo">
              <a href="#">
                 <img src="assets/img/logo.png" title=""> </img>
             </a>
         </div>
         <div id="menu">
             <ul>
                <li>
                   <a href="#" id="group-menu">
                    <img src="assets/img/menu-list.png" alt="" title=""> </img>
                   </a>

              </li>
          </ul>
      </div>
  </div>
  <div id="container">
    <div id="second">
        <div id="right">
            <img src="assets/img/background.png"> </img>
        </div>
    </div>
    <div id="first">
        <div id="left">

            <h:form class="cmxform" id="formContato" method="post" action="" onsubmit="updateButtonValue()">

                <h:inputText id="fName" value="#{controller.object.nome}" title="Nome: " tabindex="1" required="true" requiredMessage="O Nome é Obrigatório" pt:placeholder="Nome: "/>

                <h:inputText id="fMail" value="#{controller.object.mail}" title="Email: " tabindex="1" required="true" requiredMessage="O E-mail é Obrigatório" pt:placeholder="E-mail: "/>

                <h:inputText id="fPhone" value="#{controller.object.telefone}" title="Telefone: " tabindex="1" required="true" requiredMessage="O Telefone é Obrigatório" pt:placeholder="Telefone: "/>

                <h:inputText id="fInterest" value="#{controller.object.area}" title="Área de Interesse: " tabindex="1" required="true" requiredMessage="A área de Interesse é Obrigatória" pt:placeholder="Área de Interesse: "/>

                <div id="mensagem">

                </div>

                <h:commandButton value="Salvar" action="#{controller.salvar()}" ></h:commandButton> 


            </h:form>
        </div>
    </div>
</div>
</h:body>

</html>

Controller:

package web.controller;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;

import application.factory.ApplicationFactory;
import application.interfaces.IContatoApplication;
import business.Contato;

@ManagedBean
@ViewScoped
public class Controller implements Serializable
{
    private static final long serialVersionUID = 1L;

    private Object object = new Object();
    private List<Object> objects = new ArrayList<Object>();

    private IApplication application = ApplicationFactory.getInstance().getApplication();

    public void salvar()
    {   
        Set<String> erros = application.salvar(object);
    }

    public Contato getObject() {
        if(this.object == null)
            this.object = new Object();

        return object;
}

    public void setObject(Object object)
    {
        if(this.object == null)
            this.object = new Object();

        this.object = object;
    }

    public List<Object> getObjects() {
        return objects;
    }

    public void setObjects(List<Object> objects) {
        this.objects = objects;
    }
}

java jsf glassfish

asked by anonymous 28.12.2015 / 03:37

1 answer

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score 0 · Answer 1

Anderson I imagine that the class 'Object' created by you have all the desired attributes with your respective getters and setters, remembering that jsf needs the accessing methods, if yes I ask you to try something ...

Declare private Object object; so even in the managedBean Controller, create the default getters and setters, without validation as you did above, it would look like this.

public Object getObject(){
  return object;
}

public void setObject(Object object){
  this.object = object;
}

Now comes the real tip (kkk) use the init method to instantiate your class.

@PostConstruct
public void init(){
    this.object = new Object();
}

I think this will solve your problem.