File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes JSP and the fly likes Forwarding users from one JSP to another using a form. Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login

Win a copy of Java Interview Guide this week in the Jobs Discussion forum!
JavaRanch » Java Forums » Java » JSP
Bookmark "Forwarding users from one JSP to another using a form." Watch "Forwarding users from one JSP to another using a form." New topic

Forwarding users from one JSP to another using a form.

Awet Haddis

Joined: Jan 25, 2011
Posts: 11

I have an 'upload' page in my webapp that allows the user to upload data of her own. Once the user presses the 'submit' button,
I want her to be forwarded to the 'summary' page where I return the result of validation (success or failure). Once the user makes
the request, my servlet will handle it.


When I hit the 'submit' button, I encounter this error:

My JSP (summaryReport.jsp)

Any help would be greatly appreciated.
Bear Bibeault
Author and ninkuma

Joined: Jan 10, 2002
Posts: 63874

Three things:

  • Terminology matters. A form submission is not a forward. A forward is a very specific thing that occurs on the server and has nothing to do with form submission.
  • Submitting to a JSP for processing is a very old-fashioned, outdated and discredited practice. The problem you are having is a good example why. Submit to a servlet for processing, and then forward (a real forward this time) to a JSP for the view. Under such a scenario, it's practically impossible to get a NPE in a JSP. If there's a problem, it will be found in the servlet where it's much easier to diagnose and deal with.
  • Java scriptlets and scriptlet experssions in a JSP are also discredited and out-dated. Update your JSP knowledge to encompass the JSTL and EL.

  • [Asking smart questions] [About Bear] [Books by Bear]
    Stefan Evans

    Joined: Jul 06, 2005
    Posts: 1580
    Its a null pointer exception.

    So you have to ask yourself what on this page is going to be null?
    After a quick inspection of the code, the only variable you are really referencing is "props"

    I would hypothesize that the request attribute "props" has not been initialized. Where is it supposed to come from?
    It looks like you are using it as a source of message resources - the text to print out on the page. Probably to do with translation/i18n.
    The preferred JSP approach would be to use a custom tag for that. eg the JSTL <fmt:message> tag.
    I agree. Here's the link:
    subject: Forwarding users from one JSP to another using a form.
    jQuery in Action, 3rd edition