Thanks for suggestions. Please understand the data definitely stays the same in 
between clicks.
Couple of concerns:
1. I did two steps PDF generation when I was at concept proof stage, I found 
the intermediate fo file was huge and not useful, another reason is that it 
impairs performance. So I abandoned doing that. I am not sure this helps due to 
the nature of the randomness of the error.
2. If I turn off validation, is it possible to cause more bad PDF generations? 
I am just speculating.

Thanks.

Zemin

-----Original Message-----
From: Pascal Sancho [mailto:pascal.san...@takoma.fr] 
Sent: Monday, January 25, 2010 10:47 AM
To: fop-users@xmlgraphics.apache.org
Subject: Re: Create damaged PDF file

Hi,

Hu, Zemin a écrit :
> I am using XML+XSLT combination as you indicated, but the error message is 
> NOT consistent, it may disappear on next run, so I don't know how to debug my 
> template to be clean since it is clean most of the time.
>   
If the message disappears between 2 runs, that means that something has
changed in the XML source (or less probably in the XSLT).

A good practice here is to separate the full transformation into 2 stages:
1/ XSLT transformation (invoking Xalan directly, for example) and get
the XSL-FO file
2/ PDF generation, invoking FOP with the produced XSL-FO.

Benefits:
 - you can inspect (and reformat for better readability) the XSL-FO file
 - FOP can know the exact location where the error occurs, and send it
to you in the error message.
 - FOP list can help you more efficiently.

> Thanks for pointing out to me the configuration option, I was going to test, 
> but after reading document from your URL, I found it won't help in this case 
> because the default value for "strict-configuration" option is "false" 
> already.
>   
My bad, this option is for configuation file.
What I wanted to point to was the [strict-validation] option, witch
default to true.

> Zemin
>
> -----Original Message-----
> Hi,
> as the error message said, you have an empty fo:table-row in the
> resulting XSL-FO file.
> I guess you use a XML + XSLT couple to get such file, therefore you
> should debug your XSLT to produce a clean, valid XSL-FO code.
>
> An alternative is to configure FOP to be more "laxist". See
> "strict-configuration" option in FOP configuration [1].
>
> [1]
> http://xmlgraphics.apache.org/fop/0.95/configuration.html#general-elements
>
> HTH,
> Pascal
>
> Hu, Zemin a écrit :
>   
>> I am new here and have a question. 
>>
>> I am creating PDF on the fly for a web application. A PDF file is supposed 
>> to open when user clicks on a link. Occasionally the created PDF file cannot 
>> be opened and the error message says: "File is damaged and could not be 
>> repaired".
>>
>> When I read log file, I can find error message:
>> SystemErr     R (Location of error 
>> unknown)org.apache.fop.fo.ValidationException: Error(Unknown location): 
>> fo:table-row is missing child elements. Required Content Model: (table-cell+)
>>
>> The weird thing is that this error only happens at first time or first few 
>> times, then the PDF file generation goes fine. Then if user browses other 
>> pages and comes back, this can happen again. This error is not consistent, 
>> sometimes everything is just fine. This is really frustrating and hard to 
>> debug. 
>>
>> This never happened in my unit test and local environment. So I am thinking 
>> it might be the cache issue or web server configuration issue. But I have no 
>> clue. This is tough one.
>>
>> Any suggestions or solutions?
>>
>> Thanks.
>>
>> Zemin
>>     
Pascal

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