[Resolvido]dúvida show case select do primefaces

Gostaria de saber se alguém conseguiu fazer funcionar o exemplo de Double Combo do site do prime faces, entrei nesse link

http://www.primefaces.org/showcase-labs/ui/pprSelect.jsf

Copiei o codigo como estava no site, utilizando a versão 3.4 do prime, porém na hora que tento submeter com os dois combos, a requisiçao nem chega no managed bean, da erro de dado não valido no segundo combo, se eu não preencher o segundo combo vai beleza, como não da erro no console, e não chega no managed bean, eu não sei o que fazer.

se alguém puder me ajudar:

package org.primefaces.examples.view;  
  
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;

import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.context.FacesContext;
@ManagedBean(name="pprBean")
public class PPRBean implements Serializable {  
  
    /**
	 * 
	 */
	
	private static final long serialVersionUID = 1L;

	private String city;  
  
    private String suburb;  
      
    private Map&lt;String,String&gt; cities = new HashMap&lt;String, String&gt;();  
  
    private Map&lt;String,Map&gt;&lt;String,String&gt;&gt; suburbsData = new HashMap&lt;String, Map&gt;&lt;String,String&gt;&gt;();  
      
    private Map&lt;String,String&gt; suburbs = new HashMap&lt;String, String&gt;();  
  
    public PPRBean() {  
        cities.put("Istanbul", "Istanbul");  
        cities.put("Ankara", "Ankara");  
        cities.put("Izmir", "Izmir");  
          
        Map&lt;String,String&gt; suburbsIstanbul = new HashMap&lt;String, String&gt;();  
        suburbsIstanbul.put("Kadikoy", "Kadikoy");  
        suburbsIstanbul.put("Levent", "Levent");  
        suburbsIstanbul.put("Cengelkoy", "Cengelkoy");  
          
        Map&lt;String,String&gt; suburbsAnkara = new HashMap&lt;String, String&gt;();  
        suburbsAnkara.put("Kecioren", "Kecioren");  
        suburbsAnkara.put("Cankaya", "Cankaya");  
        suburbsAnkara.put("Yenimahalle", "Yenimahalle");  
          
        Map&lt;String,String&gt; suburbsIzmir = new HashMap&lt;String, String&gt;();  
        suburbsIzmir.put("Cesme", "Cesme");  
        suburbsIzmir.put("Gumuldur", "Gumuldur");  
        suburbsIzmir.put("Foca", "Foca");  
          
        suburbsData.put("Istanbul", suburbsIstanbul);  
        suburbsData.put("Ankara", suburbsAnkara);  
        suburbsData.put("Izmir", suburbsIzmir);  
    }  
      
    public String getCity() {  
        return city;  
    }  
  
    public void setCity(String city) {  
        this.city = city;  
    }  
  
    public String getSuburb() {  
        return suburb;  
    }  
  
    public void setSuburb(String suburb) {  
        this.suburb = suburb;  
    }  
  
    public Map&lt;String, String&gt; getCities() {  
        return cities;  
    }  
  
    public void setCities(Map&lt;String, String&gt; cities) {  
        this.cities = cities;  
    }  
      
    public Map&lt;String, Map&gt;&lt;String, String&gt;&gt; getSuburbsData() {  
        return suburbsData;  
    }  
  
    public void setSuburbsData(Map&lt;String, Map&gt;&lt;String, String&gt;&gt; suburbsData) {  
        this.suburbsData = suburbsData;  
    }  
      
    public Map&lt;String, String&gt; getSuburbs() {  
        return suburbs;  
    }  
  
    public void setSuburbs(Map&lt;String, String&gt; suburbs) {  
        this.suburbs = suburbs;  
    }  
      
    public void handleCityChange() {  
        if(city !=null && !city.equals(""))  
            suburbs = suburbsData.get(city);  
        else  
            suburbs = new HashMap&lt;String, String&gt;();  
    }  
  
    public void displayLocation() {  
        FacesMessage msg = new FacesMessage("Selected", "City:" + city + ", Suburb: " + suburb);  
  
        FacesContext.getCurrentInstance().addMessage(null, msg);  
    }  
}

&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt;
&lt;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:p="http://primefaces.org/ui"
	xmlns:f="http://java.sun.com/jsf/core"&gt;
&lt;h:head&gt;
&lt;/h:head&gt;
    &lt;h:form id="form"&gt;  
      
        &lt;p:growl id="msgs" showDetail="true"/&gt;  
                      
        &lt;p:panel header="Double Combo" style="margin-bottom:10px;"&gt;  
            &lt;h:panelGrid columns="2" cellpadding="5"&gt;  
                &lt;p:selectOneMenu id="city" value="#{pprBean.city}"&gt;  
                    &lt;f:selectItem itemLabel="Select City" itemValue="" /&gt;  
                    &lt;f:selectItems value="#{pprBean.cities}" /&gt;  
                    &lt;p:ajax update="suburbs"  
                            listener="#{pprBean.handleCityChange}" /&gt;  
                &lt;/p:selectOneMenu&gt;  
      
                &lt;p:selectOneMenu id="suburbs" value="#{pprBean.suburb}"&gt;  
                    &lt;f:selectItem itemLabel="Select Suburb" itemValue="" /&gt;  
                    &lt;f:selectItems value="#{pprBean.suburbs}" /&gt;  
                &lt;/p:selectOneMenu&gt;  
            &lt;/h:panelGrid&gt;  
      
            &lt;p:separator /&gt;  
              
            &lt;p:commandButton value="Submit" update="msgs" actionListener="#{pprBean.displayLocation}" id="btnSubmit"/&gt;  
      
        &lt;/p:panel&gt;  
      
    &lt;/h:form&gt;  
&lt;/html&gt;

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