protected XStream createXStream() 
{
        return new XStream();
}

 public String fromObject(Object obj,
    String resultCode,
    Writer out) throws IOException 
{
        if (obj != null) {
            XStream xstream = createXStream();
            xstream.toXML(obj, out);
        }
        return null;
}

 public String getContentType() 
{
        return "application/xml";
}

 public String getExtension() 
{
        return "xml";
}

 public  void toObject(Reader in,
    Object target) 
{
        XStream xstream = createXStream();
        xstream.fromXML(in, target);
}