Datatable funciona na aplicação local mas não funciona quando implemento no servidor Glassfish

A pagina abaixo funciona nomalmente na aplicação quando rodo no netbeans usando o Glassfish instalado na maquina que estou desenvolvendo, mas quando eu coloco o .war da aplicação no Servidor Glassfish da rede quando vou abrir a pagina ramais apresenta o seguinte erro

exception

javax.servlet.ServletException: /ramais.xhtml @13,108 value="#{tableBean.ramais}": Target Unreachable, identifier ‘tableBean’ resolved to null
root cause

javax.el.PropertyNotFoundException: /ramais.xhtml @13,108 value="#{tableBean.ramais}": Target Unreachable, identifier ‘tableBean’ resolved to null

pagina ramais.xhtml

<?xml version='1.0' encoding='ISO-8859-1' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:ui="http://java.sun.com/jsf/facelets"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:p="http://primefaces.org/ui">
    <ui:decorate template="/tema/padrao.xhtml">
        <ui:define name="centro">                                    
            <h:form prependId="false" > 
                <p:commandButton id="btImprimir" value="Imprimir" image="ui-icon-wrench" actionListener="#{tableBean.PDF}" ajax="false" onclick="form.target='_blank'" />

                <p:dataTable id="basic" var="ramal" value="#{tableBean.ramais}" paginator="true" rows="10" style="text-align: center">
                    <p:column id="modelHeader">
                        <f:facet name="header">
                                SETOR
                        </f:facet>
                        <h:outputText value="#{ramal.setor}" />
                    </p:column>

                    <p:column>
                        <f:facet name="header">
                                RESPONSÁVEL
                        </f:facet>
                        <h:outputText value="#{ramal.responsavel}" />
                    </p:column>

                    <p:column>
                        <f:facet name="header">
                                RAMAL
                        </f:facet>
                        <h:outputText value="#{ramal.numero}" />
                    </p:column>

                </p:dataTable>
            </h:form>
        </ui:define>
    </ui:decorate>
</html>

import java.io.IOException;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperExportManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;

@ManagedBean(name="tableBean")
@SessionScoped  
public class TableBean implements Serializable{

    private List<Ramal> ramais;
    private Ramal ramal;
    
    JasperPrint jasperPrint;
        
    public TableBean() {
        ramais = new ArrayList<Ramal>();
        
        ramal = new Ramal(240,"TESTE1","");             
        ramais.add(ramal);
        ramal = new Ramal(242,"TESTE2","");                     
        ramais.add(ramal);
        ramal = new Ramal(243,"TESTE3","");                     
        ramais.add(ramal);
        ramal = new Ramal(237,"TESTE4","");                     
        ramais.add(ramal);
        ramal = new Ramal(207,"TESTE5","");                     
        ramais.add(ramal);
    }
    
    public List<Ramal> getRamais() {
        return ramais;
    } 

    /* IMPRESSAO USANDO JASPERREPORTS */            
    public void init() throws JRException{       
        JRBeanCollectionDataSource beanCollectionDataSource = new JRBeanCollectionDataSource(ramais);
        String  reportPath=  FacesContext.getCurrentInstance().getExternalContext().getRealPath("/relatorios/ramais.jasper");        
        jasperPrint = JasperFillManager.fillReport(reportPath, new HashMap(), beanCollectionDataSource);
    }

    public void PDF(ActionEvent actionEvent) throws IOException, JRException{
        init();
        HttpServletResponse httpServletResponse = (HttpServletResponse) FacesContext.getCurrentInstance().getExternalContext().getResponse();
        httpServletResponse.setHeader("Content-disposition", "inline;filename=report1.pdf");        
        ServletOutputStream servletOutputStream = httpServletResponse.getOutputStream();                
        JasperExportManager.exportReportToPdfStream(jasperPrint, servletOutputStream);        
        FacesContext.getCurrentInstance().responseComplete();
    }    
    
}

public class Ramal {
    
    private int numero;
    private String setor;
    private String responsavel;

    public Ramal(int numero, String setor, String responsavel) {
        this.numero = numero;
        this.setor = setor;
        this.responsavel = responsavel;
    }
    
    public int getNumero() {
        return numero;
    }

    public void setNumero(int numero) {
        this.numero = numero;
    }

    public String getResponsavel() {
        return responsavel;
    }

    public void setResponsavel(String responsavel) {
        this.responsavel = responsavel;
    }

    public String getSetor() {
        return setor;
    }

    public void setSetor(String setor) {
        this.setor = setor;
    }
  
}

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