Greetings Filippo and welcome to the ranch :-)
I was going through the files you have provided and saw that you are Re-Directing to a jsp page as follows. Redirection works with action only as Richard said
If you need to open a JSP page that will be the input page , then just use result type = "success" . The params will be there already on the valuestack and
you should be able to access them with the OGNL notation ${name} . Be sure to write the appropriate getter/setters before opening the input jsp page to push the params on the valuestack