how to catch a fileupload exception (or use multiple exception pages)

[Peter Hulst <ph...@triporama.com>]

I'm trying to implement multiple exception pages in my application but 
running into problems with that.

How can I redirect to another exception page from my custom Exception page, 
or how can I send one particular type of exception to a different page?

Basically, I've created my own Exception page which works fine. In the 
pageBeginRender method I create an error message and email that off to the 
administrator. This works for most errors but there's one particular error 
that I'd like to handle in a different way: the fileupload 
SizeLimitExceededException. In that case I would like to display a 
different page, instructing the user to try again with a smaller file size, 
and provide a link back to the upload page.

So I check for that particular exception in my exception page and if it 
occurred, I call:

throw new PageRedirectException("UploadFileTooBigError");

However, that doesn't work. It throws the following servlet exception:

javax.servlet.ServletException: UploadImageError
         org.apache.tapestry.engine.AbstractEngine.activateExceptionPage(AbstractEngine.java:480)
         org.apache.tapestry.engine.AbstractEngine.service(AbstractEngine.java:914)
...root cause
org.apache.tapestry.PageRedirectException: UploadImageError
         triporama.webapp.pages.error.Exception.pageBeginRender(Exception.java:164)
         org.apache.tapestry.AbstractPage.firePageBeginRender(AbstractPage.java:463)
         org.apache.tapestry.AbstractPage.renderPage(AbstractPage.java:293)


telling me that in an Exception page it's not ok to throw a 
PageRedirectException.

What else can I do to catch this
org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException
exception?
afaik there's nothing I can do in my page to catch this because this kind 
of error occurs before my upload page even starts to render.


My .application file contains the following:

   <extension name="org.apache.tapestry.multipart-decoder"
       class="org.apache.tapestry.multipart.DefaultMultipartDecoder">
     <configure property-name="maxSize" type="double" value="300000"/>
   </extension>


I suppose I could simply put a big conditional in the Exception page 
template and have it display different html and messages based on the type 
of Exception that occurred - but there might be a better approach?

any help appreciated,
Peter





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Re: how to catch a fileupload exception (or use multiple exception pages)

[Kent Tong <ke...@cpttm.org.mo>]

Peter Hulst <phulst <at> triporama.com> writes:

> I suppose I could simply put a big conditional in the Exception page 
> template and have it display different html and messages based on the type 
> of Exception that occurred - but there might be a better approach?

That's about the best way that I can think of. You could
use a Delegator in your Exception page like:

<span jwcid="@Delegator" delegate="delegate"/>

Then define getDelegate() like:

public IRenderer getDelegate() {
   if (getException() instance of XXX) {
      return getRequestCycle().getPage("XXXPage");
   }
   if (getException() instance of YYY) {
      return getRequestCycle().getPage("YYYPage");
   }
}




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