Mostrar los atributos del scope request

java.util.Enumeration en = request.getAttributeNames(); 
while (en.hasMoreElements()) { 
   String name = (String) en.nextElement(); 
   if(request.getAttribute(name) == null) { 
      log.debug(name + "=NULL"); 
   } else { 
           log.debug(name + "=" + request.getAttribute(name).toString()); 
   } 
}