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From Sylvain Wallez <>
Subject Handling oversized uploads with the application
Date Thu, 18 Aug 2005 13:21:07 GMT
Hi all,

Uploads in Cocoon are handled at the servlet level, including a check of 
the maximum upload size which raises an exception. This exception is a 
major pain because it gives no chance to the application to warn the 
user that she exceeded the allowed limit. All we get is an ugly servlet 
engine-generated error page.

Rather than throwing an exception, the multipart parser could store in 
the request a special implementation of the Part interface, 
"InvalidPart" that allows the application to know about it and react 
accordingly. For example, the CForms upload widget could show a 
validation error in such occasions.

All methods of the Part interface (getInputStream, getName, etc) would 
of course throw an exception in InvalidPart, but that exception would 
have a chance to be handled cleanly by a <map:handle-errors>



Sylvain Wallez                        Anyware Technologies
Apache Software Foundation Member     Research & Technology Director

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