Primefaces fileUpload not working

Question

I have problems with p:fileUpload . I have this code and I have implemented everything that says PrimeFaces Guide and just not working. The FileUpload buttons do nothing.

XHTML

 <p:fileUpload
                        fileUploadListener="#{crearSitiosControlador.handleFileUpload}"
                        mode="advanced" dragDropSupport="false" update="messages"
                        sizeLimit="100000" fileLimit="5" uploadLabel="Subir"
                        cancelLabel="Cancelar" label="Seleccionar"
                        invalidSizeMessage="Tamaño permitido 1MB"
                        invalidFileMessage="Archivo no permitido"
                        allowTypes="/(\.|\/)(gif|jpe?g|png)$/" />
                    <p:growl id="messages" showDetail="true" />

JAVA

 public void handleFileUpload(FileUploadEvent event) {  
        foto =  event.getFile();    
        fotoByte= new byte[(int) foto.getSize()];
        fotoByte = event.getFile().getContents();   

        try {       
            FileInputStream docu = new FileInputStream((File) event.getFile());
            // Leemos los bytes del archivo y a la vez se van insertando en el
            // array de bytes creado.
            int numBytes = docu.read(fotoByte);
            docu.close(); 
        } catch (FileNotFoundException e) {
            System.out.println("No se ha encontrado el archivo.");
        } catch (IOException e) {
            System.out.println("No se ha podido leer el archivo.");
        }

    }

WEBXML

      <param-name>primefaces.UPLOADER</param-name>
    <param-value>auto|native|commons</param-value>
  </context-param> 

  <filter>
  <filter-name>PrimeFaces FileUpload Filter</filter-name>
  <filter-class>
  org.primefaces.webapp.filter.FileUploadFilter  
  </filter-class>  
  </filter>

  <filter-mapping>
  <filter-name>PrimeFaces FileUpload Filter</filter-name>
  <servlet-name>Faces Servlet</servlet-name>
  </filter-mapping>