Using tree in jsf

Hi;
i would like to do a menu using the tree component in order that i get a menu like :
->Femme (r�pertoire parent)
----> |--Jupe (r�pertoire fils)
------> |-- Marque
------> |-- Couleur
----> |--Pantalon (r�pertoire fils)
------> |-- Marque
------> |-- Couleur
->Homme (r�pertoire parent)
----> |--Chemise (r�pertoire fils)
------> |-- Marque
------> |-- Couleur
----> |--Pantalon (r�pertoire fils)
------> |-- Marque
------> |-- Couleur
so how can i use this component (i am using trinidad api and it conteint the tag <tr:tree>)

i found this code but i dont know how to use it;
<tr:tree var="component" value="#{componentTree.model}"
                binding="#{componentTreeBean.tree}">
                <f:facet name="nodeStamp">
                  <tr:panelGroupLayout>
                    <tr:outputText value="Example:" rendered="#{component.example}"/>
                    <tr:commandLink text="#{component.label}"
                      disabled="#{empty component.filename}"
                      action="#{component.view}"/>
                  </tr:panelGroupLayout>
                </f:facet>
              </tr:tree>so did anyone know the how to use this code to generate tree.
thank you in advance

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         at org.apache.myfaces.component.html.util.ExtensionsFilter.doFilter(ExtensionsFilter.java:122)
         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
         at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
         at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:54)
         at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:174)
         at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:868)
         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:663)
         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
         at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
         at java.lang.Thread.run(Unknown Source)
    Caused by: org.apache.jasper.JasperException: Cannot get value for expression '#{PropiedadesBean.allProperties}'
         at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:370)
         at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
         at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
         at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
         at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
         at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
         at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
         at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:415)
         ... 50 more
    10:20:30,022 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception
    javax.faces.FacesException: Cannot get value for expression '#{PropiedadesBean.allProperties}'
         at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:421)
         at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:234)
         at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:352)
         at javax.faces.webapp.FacesServlet.service(FacesServlet.java:107)
         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
         at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
         at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
         at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
         at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
         at org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:693)
         at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:660)
         at org.apache.jsp.index_jsp._jspService(org.apache.jsp.index_jsp:49)
         at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
         at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
         at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
         at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
         at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
         at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
         at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
         at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
         at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:415)
         at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:234)
         at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:352)
         at javax.faces.webapp.FacesServlet.service(FacesServlet.java:107)
         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
         at org.apache.myfaces.component.html.util.ExtensionsFilter.doFilter(ExtensionsFilter.java:122)
         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
         at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
         at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:54)
         at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:174)
         at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:868)
         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:663)
         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
         at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
         at java.lang.Thread.run(Unknown Source)
    Caused by: org.apache.jasper.JasperException: Cannot get value for expression '#{PropiedadesBean.allProperties}'
         at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:370)
         at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
         at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
         at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
         at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
         at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
         at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
         at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:415)
         ... 50 more
    10:20:30,032 ERROR [[Faces Servlet]] Servlet.service() for servlet Faces Servlet threw exception
    javax.faces.FacesException: Cannot get value for expression '#{PropiedadesBean.allProperties}'
         at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:421)
         at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:234)
         at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:352)
         at javax.faces.webapp.FacesServlet.service(FacesServlet.java:107)
         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
         at org.apache.myfaces.component.html.util.ExtensionsFilter.doFilter(ExtensionsFilter.java:122)
         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
         at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
         at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:54)
         at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:174)
         at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:868)
         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:663)
         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
         at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
         at java.lang.Thread.run(Unknown Source)
    Caused by: javax.servlet.ServletException: Cannot get value for expression '#{PropiedadesBean.allProperties}'
         at javax.faces.webapp.FacesServlet.service(FacesServlet.java:121)
         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
         at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
         at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
         at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
         at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
         at org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:693)
         at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:660)
         at org.apache.jsp.index_jsp._jspService(org.apache.jsp.index_jsp:49)
         at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
         at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
         at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
         at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
         at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
         at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
         at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
         at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
         at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:415)
         ... 25 moreMy jsf is that
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
        pageEncoding="ISO-8859-1"%>
    <%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
    <%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>propiedad</title>
    </head>
    <body>
    <f:view>
         <h:form id ="Properties">
              <h:dataTable id ="Propiedades" value="#{PropiedadesBean.allProperties}" var="prop" border="1">
                   <h:column>
                        <f:facet name="header">
                             <h:outputText value="Referencia"></h:outputText>
                        </f:facet>
                        <h:outputText value="#{prop.referencia}"></h:outputText>
                   </h:column>
                   <h:column>
                        <f:facet name="header">
                             <h:outputText value="Habitaciones"></h:outputText>
                        </f:facet>                    
                        <h:outputText value="#{prop.nHabitaciones}"></h:outputText>
                   </h:column>
              </h:dataTable>
         </h:form>
    </f:view>
    </body>
    </html>My bean is that
    import java.io.Serializable;
    import java.util.List;
    import java.util.ArrayList;
    import javax.ejb.Local;
    import javax.ejb.Remote;
    import javax.ejb.Stateless;
    import javax.faces.context.FacesContext;
    import javax.faces.el.ValueBinding;
    import javax.persistence.EntityManager;
    import javax.persistence.PersistenceContext;
    import javax.persistence.Query;
    @Stateless (name="propiedadesLocal")
    public class PropiedadesBean implements LocalPropiedades, Serializable {
         @PersistenceContext (unitName="test")
         private EntityManager em;
         public List <Propiedad> getAllProperties() {
              ArrayList<Propiedad> propiedades = new ArrayList<Propiedad>();
              ValueBinding beanValueBinding = facesContext.getApplication().createValueBinding("#{propiedadesBean.allProperties}");*/
              Query q = em.createQuery("From propiedades");
              for (Object o: q.getResultList()) {
                   propiedades.add((Propiedad) o);
              return propiedades; 
    }this statement doesn't work
    Query q = em.createQuery("From propiedades");
    When I put a checkpoint. I see the em variable is null.
    Here I've got only a function returns a ArrayList. This class implements the business logic.
    My another class implements the pesistence is that.
    package org.jboss.jose.db;
    import javax.persistence.*;
    import java.util.*;
    import java.io.Serializable;
    import javax.persistence.*;
    import javax.persistence.Id;
    @Entity
    @Table(name="propiedades")
    public class Propiedad implements Serializable{
         private int referencia;
         private double precio1;
         private String referenciaCliente;
         private int nHabitaciones;
         private int cuartosDeBa�o;
         private Empleado empleado;
         //static final long serialVersionUID = 1L;;
         public Propiedad(){};
         public int getCuartosDeBa�o() {
              return cuartosDeBa�o;
         public void setCuartosDeBa�o(int cuartosDeBa�o) {
              this.cuartosDeBa�o = cuartosDeBa�o;
         public int getNHabitaciones() {
              return nHabitaciones;
         public void setNHabitaciones(int habitaciones) {
              nHabitaciones = habitaciones;
         public double getPrecio1() {
              return precio1;
         public void setPrecio1(double precio1) {
              this.precio1 = precio1;
         @Id //(generate = GeneratorType.AUTO)
         @GeneratedValue
         @Column (name = "Referencia")     
         public int getReferencia() {
              return referencia;
         public void setReferencia(int referencia) {
              this.referencia = referencia;
         public String getReferenciaCliente() {
              return referenciaCliente;
         public void setReferenciaCliente(String referenciaCliente) {
              this.referenciaCliente = referenciaCliente;
         //@JoinColumn (name = "idEmpleado")
         @ManyToOne
         public Empleado getEmpleado() {
              return empleado;
         public void setEmpleado(Empleado empleado) {
              this.empleado = empleado;
    The servlet that works
    package org.jboss.jose.web;
    import javax.servlet.http.HttpServlet;
    import java.io.IOException;
    import java.io.PrintWriter;
    import javax.naming.Context;
    import javax.naming.InitialContext;
    import javax.naming.NamingException;
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    //import java.io.IOException;
    import org.jboss.jose.db.*;
    //import org.jboss.ejb.PropiedadesBean;
    public class PropiedadServlet extends HttpServlet {
         private LocalPropiedades propiedadesBean;
         private EmpleadosBean empleadosBean;
         protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {          
              this.mostrarPropiedades(req, resp);
         public void init() throws ServletException {
              try {
                   Context context = new InitialContext();
                   this.propiedadesBean = (LocalPropiedades) context.lookup("inmovil/propiedadesLocal/local");
                   this.propiedadesBean.addEmpleadoPropiedad("jose",1,"1",1000.00,"1000",1,1);          
              } catch (NamingException e) {
                   // TODO Auto-generated catch block
                   System.out.println(e.getMessage());
    //               e.printStackTrace();
         private void mostrarPropiedades(HttpServletRequest req, HttpServletResponse resp) throws ServletException ,IOException {
              PrintWriter out = resp.getWriter();
              for (Propiedad prop: this.propiedadesBean.getAllProperties()) {
                   out.p                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    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    this.propiedadesBean = (LocalPropiedades)
    context.lookup("inmovil/propiedadesLocal/local");Whenever you need it. For example within an ActionHandler which loads the bean
    and makes a DTO Object (Bean used by the JSF Page) available for the JSF Page.
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