Apache FileUpload: My form is going crazy!

Hi!. I'm really stuck, I hope anyone could help me.

This is my JSP

<!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" xml:lang="es" lang="es">

<head>
  
    <base href="http://localhost:9090/wdi/" />
    <meta http-equiv="content-type" content="text/html;charset=UTF-8" />
    
    <title>Departamento de Informática de la Universidad de Oviedo</title>
    
    <link rel="stylesheet" type="text/css" href="css/estilo.css" />
  
  </head>
  
  <body>
    
      <div id="cabecera">
        <h1>Departamento de Informática de la Universidad de Oviedo</h1>
      </div>
      
      <div id="cuerpo">
      
      	<div id="menu">
      		
      		<ul>
      		
      			<li><a href="private/pas/documentos/buscar.jsp" accesskey="1">Buscar documentos <span class="atajo">[1]</span></a></li>
      			<li id="actual">Subir documentos</li>
      			<li><a href="private/pas/tablon/tablon.jsp" accesskey="3">Actualizar el tablón <span class="atajo">[3]</span></a></li>
      			<li><a href="LogoutAplicacion" accesskey="9">Salir <span class="atajo">[9]</span></a></li>
      		
      		</ul>
      		
      	</div>
      	
      	<div id="contenido">
      	
      		<h2>Subir documentos</h2>
      		
      		<form action="SubirDocumentoAplicacion" method="post" enctype="multipart/form-data">
      			<label for="titulo">Título</label><br />
      			<input type="text" name="titulo" id="titulo" /><br />
      			<label for="documento">Documento</label><br />
      			<input type="file" name="documento" id="documento" /><br />
      			<input type="submit" value="Enviar" />
      		</form>
      	
      	</div>
      
      </div>
      
      <div id="pie">
      
        <ul id="estandares">
        
          <li>
            <a href="http://validator.w3.org/check?uri=referer">
              <img src="http://www.w3.org/Icons/valid-xhtml10"
                   alt="XHTML 1.0 Transitional válido" />
            </a>
          </li>
          
          <li>
    		<a href="http://jigsaw.w3.org/css-validator/check/referer">
        	  <img src="http://jigsaw.w3.org/css-validator/images/vcss"
                   alt="CSS válido" />
    		</a>
    	  </li>
    	  
    	  <li>
    		<img src="recursos/AAIcono.gif"
                 alt="Nivel AA de accesibilidad cumplido" />
    	  </li>
          
        </ul>
      
      </div>
    
  </body>
  
</html>

And this is my Servlet

package com.wdi.presentacion.servlets.pas;
import java.io.IOException;
import java.util.List;
import javax.jcr.Session;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.springframework.context.ApplicationContext;
import com.wdi.comun.constantes.AplicacionURL;
import com.wdi.comun.entidades.DocumentoBean;
import com.wdi.presentacion.GestionDocumentosHelper;

public class SubirDocumentoServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

@Override

protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {

doPost(req, resp);

}

@SuppressWarnings("unchecked")
	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {

if(!ServletFileUpload.isMultipartContent(req))
		{
			throw new ServletException("El formulario debe ser multipart");
		}
		try
		{
			String titulo = null;
			FileItem fichero = null;

FileItemFactory factory = new DiskFileItemFactory();
			ServletFileUpload upload = new ServletFileUpload(factory);	
			List<FileItem> items = upload.parseRequest(req);

for(FileItem item : items)
			{
				if(item.isFormField())
				{
              				titulo = item.getString();
				}
				else
				{
					fichero = item;
				}
			}

DocumentoBean documentoBean = new DocumentoBean(titulo, null);
			ApplicationContext contexto = (ApplicationContext) req.getSession().getAttribute("contexto");
			// necesario habilitar las cookies en el navegador
			Session sesion = (Session) req.getSession().getAttribute("sesion");
			System.out.println("contenido:" + fichero);
			System.out.println("titulo:" + titulo);
			System.out.println("titulo:" + req.getParameter("titulo"));
			new GestionDocumentosHelper().addDocumento(contexto, sesion, documentoBean, fichero);
			resp.sendRedirect(AplicacionURL.getURLBienvenidaPAS());
		}
		catch(Exception e)
		{
			System.out.println(e.getMessage());
			resp.sendRedirect(AplicacionURL.getURLBienvenidaPAS());
		}
	}

}

When I complete the form with a text and a pdf the result of the prints are:

contenido:null
titulo:null
titulo:Ejemplo

¿How can be possible?. The parameter recovered with getAttribute works even when the form is multipart and it can't work in that way, and the parser of the commons upload returns everything null when parses the multipart data.

I hope some help, I'm stuck since yesterday :S. Thanks!

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I've solved it!.

The code is ok. The reason of this strange behaviour is the Struts. I have a filter in the web.xml to redirect everything on my web application throught the Struts Dispatcher. Maybe because I'm uploading the file using a servlet instead an Struts action, the file can't be sent properly.