Target Unreachable error, Identifier 'Clientebean' resolved to null

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System with error:

Error message:

Caused by: javax.el.Propertynotfoundexception: /index.xhtml @22,72 value="#{Clientebean.cliente.name}": Target Unreachable, Identifier 'Clientebean' resolved to null at com.sun.faces.facelets.el.TagValueExpression.getType(Tagvalueexpression.java:100) at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(Htmlbasicinputrenderer.java:95) at javax.faces.Component.UIInput.getConvertedValue(Uiinput.java:1045) at javax.faces.Component.UIInput.validate(Uiinput.java:975) at javax.faces.Component.UIInput.executeValidate(Uiinput.java:1248) at javax.faces.Component.UIInput.processValidators(Uiinput.java:712) at javax.faces.Component.UIComponentBase.processValidators(Uicomponentbase.java:1258) at javax.faces.Component.UIForm.processValidators(Uiform.java:253) at javax.faces.Component.UIComponentBase.processValidators(Uicomponentbase.java:1258) at javax.faces.Component.UIComponentBase.processValidators(Uicomponentbase.java:1258) at javax.faces.Component.UIViewRoot.processValidators(Uiviewroot.java:1195) at com.sun.faces.lifecycle.Processvalidationsphase.execute(Processvalidationsphase.java:76) ... 24 more Caused by: javax.el.Propertynotfoundexception: Target Unreachable, Identifier 'Clientebean' resolved to null at org.apache.el.parser.Astvalue.getTarget(Astvalue.java:74) at org.apache.el.parser.Astvalue.getType(Astvalue.java:58) at org.apache.el.ValueExpressionImpl.getType(Valueexpressionimpl.java:168) at com.sun.faces.facelets.el.TagValueExpression.getType(Tagvalueexpression.java:98) ... 35 more

Controller Bean

/*
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 * and open the template in the editor.
 */
package controller;

/**
 *
 * @author alunoti
 */
import dao.ClienteDAO;
import java.io.Serializable;
import java.util.List;
import javax.ejb.EJB;
import javax.enterprise.context.SessionScoped;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
import javax.inject.Named;
import modelo.Cliente;

/**
 *
 * @author andii
 */
@Named(value = "ClienteBean")
@SessionScoped
public class ClienteBean implements Serializable {

    @EJB
    private ClienteDAO clienteDAO;
    private Cliente cliente = new Cliente();
    private List<Cliente> clientes;

    public void novo(){
        cliente = new Cliente();
    }

    public void gravar() {
        FacesContext context = FacesContext.getCurrentInstance();
        boolean resultado = clienteDAO.gravar(cliente);

        if (resultado) {
            cliente = new Cliente();
            context.addMessage(null, new FacesMessage("Cliente gravado com sucesso"));
        } else {
            context.addMessage(null, new FacesMessage("Falha ao gravar cliente!"));
        }
    }

    public void selecionar(ActionEvent evento) {
        Long codigo = (Long) evento.getComponent().getAttributes().get("codigo");
        cliente = clienteDAO.selecionar(codigo);
    }

    public void remover() {
        FacesContext context = FacesContext.getCurrentInstance();
        boolean resultado = clienteDAO.remover(cliente);

        if (resultado) {
            cliente = new Cliente();
            context.addMessage(null, new FacesMessage("Cliente removido com sucesso"));
        } else {
            context.addMessage(null, new FacesMessage("Falha ao remover cliente!"));
        }
    }

    //Getters e Setters
    public Cliente getCliente() {
        return cliente;
    }

    public void setCliente(Cliente cliente) {
        this.cliente = cliente;
    }

    public List<Cliente> getClientes() {
        clientes = clienteDAO.listar();
        return clientes;
    }

    public void setClientes(List<Cliente> clientes) {
        this.clientes = clientes;
    }
}

index.xhtml

<?xml version='1.0' encoding='UTF-8' ?>

<!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">
    <h:head>
        <title>Facelet Title</title>
    </h:head>
    <h:body>
        <h:form id="dadosCliente">
            <fieldset style="width: 350px">
                <legend>Novo cliente</legend>
                <h:commandButton value="Novo" action="#{ClienteBean.novo}" />
            </fieldset>
            <fieldset style="width: 350px">
                <legend>Dados do cliente</legend>
                <h:panelGrid columns="4">
                    <h:outputText value="Nome" />
                    <h:inputText value="#{ClienteBean.cliente.nome}" />
                    <h:commandButton value="Gravar" action="#{ClienteBean.gravar}" />
                    <h:commandButton value="Remover" action="#{ClienteBean.remover}" rendered="#{ClienteBean.cliente.codigo > 0}" />
                </h:panelGrid>
            </fieldset>
        </h:form>

        <h:form>
            <fieldset style="width: 350px">
                <legend>Clientes</legend>
                <h:dataTable value="#{ClienteBean.clientes}" var="cliente" border="1">
                    <h:column>
                        <f:facet name="header"><h:outputText value="CODIGO" /></f:facet>
                        <h:outputText value="#{Cliente.codigo}" />
                    </h:column>
                    <h:column>
                        <f:facet name="header"><h:outputText value="NOME" /></f:facet>
                        <h:outputText value="#{Cliente.nome}" />
                    </h:column>
                    <h:column>
                        <h:commandButton value="Selecionar" actionListener="#{ClienteBean.selecionar}">
                            <f:attribute name="codigo" value="#{Cliente.codigo}" />
                            <f:ajax render=":dadosCliente" execute="@this" />
                        </h:commandButton>
                    </h:column>
                </h:dataTable>
            </fieldset>
        </h:form>
    </h:body>
</html>

persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
  <persistence-unit name="crudPU" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <class>modelo.Cliente</class>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
      <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3307/bancoteste?zeroDateTimeBehavior=convertToNull"/>
      <property name="javax.persistence.jdbc.user" value="root"/>
      <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
      <property name="javax.persistence.jdbc.password" value=""/>
      <property name="hibernate.cache.provider_class" value="org.hibernate.cache.NoCacheProvider"/>
      <property name="javax.persistence.schema-generation.database.action" value="create"/>
    </properties>
  </persistence-unit>
</persistence>

System Screen Tela do sistema

System screen with error: bug sistema

java jsf hibernate jpa ejb

2 answers

1


I had a similar problem. I don’t know if this is the case, but when using netbeans and creating managedBeans it matters to:

import javax.inject.Named;
import javax.enterprise.context.RequestScoped;

If using Glassfish is no problem, because it already has Weld built in, but in the case of Tomcat it is better to change the imports to:

import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;

Or add Weld dependencies if working with Dependency injection:

        <!--Weld (implementação do CDI)--> 
        <dependency>
            <groupId>org.jboss.weld.servlet</groupId>
            <artifactId>weld-servlet</artifactId>
            <version>2.2.10.Final</version>
            <scope>compile</scope>
        </dependency>

        <!--Weld depende do Jandex--> 
        <dependency>
            <groupId>org.jboss</groupId>
            <artifactId>jandex</artifactId>
            <version>2.0.3.Final</version>
            <scope>compile</scope>
        </dependency>

1

  1. Make XHTML reference only clienteBean and not ClienteBean

  2. Remove the annotation @Named

  3. Enter the annotation @ManagedBean

  4. Change the scope of @SessionScoped for @ViewScoped

  • Devo alter no Clientebean.java: Sessionscoped paraViewScoped ??

  • @alexjosesilva this will work. But maybe it’s not what you want. If you want to keep the @SessionScoped you should open an HTTP session before trying to access the page in question

  • did not solve.. is still coming out the same mistake!

  • After all what error is this: Target Unreachable, Identifier 'Clientebean' resolved to null ?

  • @alexjosesilva ah cara, agora que vi. In XHTML you should reference your Managedbean with the first letter with lowercase letter. So: value="#{clienteBean.cliente.nome} and not value="#{ClienteBean.cliente.nome}

  • @alexjosesilva is the NullPointerException of the JSF.

  • Let’s go continue this discussion in chat.

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