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Date: Wed, 1 Aug 2007 20:49:00 -0500
From: "Paul Benedict" <pbenedict@apache.org>
Sender: paulus.benedictus@gmail.com
To: "Struts Users Mailing List" <user@struts.apache.org>
Subject: Re: DownloadAction and a normal Forward
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Who is throwing the NPE? I can't tell by your code what's causing it.

On 8/1/07, Frank W. Zammetti <fzlists@omnytex.com> wrote:
>
> You know, I just reread what your trying to do... have you tried using a
> global exception handler?  I'm not sure you'll be able to catch the
> exception with one, but if you give it a try and you can, there you go,
> you can forward as desired from there.
>
> --
> Frank W. Zammetti
> Founder and Chief Software Architect
> Omnytex Technologies
> http://www.omnytex.com
> AIM/Yahoo: fzammetti
> MSN: fzammetti@hotmail.com
> Author of "Practical Ajax Projects With Java Technology"
> (2006, Apress, ISBN 1-59059-695-1)
> and "JavaScript, DOM Scripting and Ajax Projects"
> (2007, Apress, ISBN 1-59059-816-4)
> Java Web Parts - http://javawebparts.sourceforge.net
> Supplying the wheel, so you don't have to reinvent it!
>
> On Wed, August 1, 2007 10:38 am, Gundersen, Richard wrote:
> > Hi
> >
> > Thanks for the reply. Tried it and it still gives me a NullPointer.
> > Maybe that's not such a problem though - since the browser still
> > redirects to the JSP I want.
> >
> > However, I was wondering if it's possible to use a ResourceStreamInfo to
> > redirect to an ActionForward (which ultimately leads to a JSP). Would
> > this be preferable to using RequestDispatcher.forward(request,
> > response)?
> >
> > Richard Gundersen
> > Java Developer
> >
> > Email: richard.gundersen@london-scottish.com
> > Phone: 01618302398
> > Fax: 01618342536
> > London Scottish Bank plc
> > 24 Mount Street
> > Manchester
> > M2 3LS
> >
> > -----Original Message-----
> > From: Frank W. Zammetti [mailto:fzlists@omnytex.com]
> > Sent: Wednesday, August 01, 2007 2:47 PM
> > To: Struts Users Mailing List
> > Cc: user@struts.apache.org
> > Subject: Re: DownloadAction and a normal Forward
> >
> > It's not the *right* answer, and I'm not sure it won't cause some other
> > exception anyway (in fact, I'd bet it would), but what if instead of
> > returning null you instead do:
> >
> > return new ByteArrayStreamInfo(null, null);
> >
> > ?
> >
> > Frank
> >
> > --
> > Frank W. Zammetti
> > Founder and Chief Software Architect
> > Omnytex Technologies
> > http://www.omnytex.com
> > AIM/Yahoo: fzammetti
> > MSN: fzammetti@hotmail.com
> > Author of "Practical Ajax Projects With Java Technology"
> >  (2006, Apress, ISBN 1-59059-695-1)
> > and "JavaScript, DOM Scripting and Ajax Projects"
> >  (2007, Apress, ISBN 1-59059-816-4)
> > Java Web Parts - http://javawebparts.sourceforge.net
> >  Supplying the wheel, so you don't have to reinvent it!
> >
> > On Wed, August 1, 2007 9:24 am, Gundersen, Richard wrote:
> >> Hi
> >>
> >> I'm using a DownloadAction to generate a PDF and return it the the
> >> browser. If there is a problem generating the PDF however, I want to
> >> redirect the user to a specific JSP.
> >>
> >> What's the best way of doing this? At the moment I am using
> >>
> >>
> >> protected StreamInfo getStreamInfo(ActionMapping mapping, ActionForm
> >> form,
> >>                                        HttpServletRequest request,
> >> HttpServletResponse response) {
> >> ...
> >> ...
> >> ...
> >>      if(problem)
> >>
> >>
> > servlet.getServletContext().getRequestDispatcher("/admin.do?doAction=alr
> >> eadyPrinted").forward(request, response);
> >>              return null;
> >>      }
> >>      else {
> >>              return new ByteArrayStreamInfo(contentType, myPdfBytes);
> >>      }
> >> }
> >>
> >> This works, but I always get a NullPointer, because I'm returning null
> >> to satisfy the method signature. The exception doesn't cause a problem
> >> for the user though, because the forward has already happened by then
> >> (and the user is happily viewing the JSP)
> >>
> >> Is there a better way to do this though - perhaps with
> >> ResourceStreamInfo instead?
> >>
> >> Regards
> >>
> >> Richard Gundersen
> >> Java Developer
> >>
> >> Email: richard.gundersen@london-scottish.com
> >> Phone: 01618302398
> >> Fax: 01618342536
> >> London Scottish Bank plc
> >> 24 Mount Street
> >> Manchester
> >> M2 3LS
> >>
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