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From Andreas Delmelle <andreas.delme...@telenet.be>
Subject Re: FOP works until web app is re-deployed to Tomcat
Date Sat, 01 Nov 2008 11:49:02 GMT
On Oct 31, 2008, at 22:16, jhall wrote:

> Andreas Delmelle-2 wrote:
>>
>> Can you do us a favor, and re-run the test with a slight addition?
>> see: http://xmlgraphics.apache.org/fop/faq.html#saxexception-mismatch
>>
>> It will still fail, but it's very likely that, after adding the
>> ErrorListener override to the base Transformer used in your webapp,
>> the stack trace will be slightly more meaningful.
>>
>
> In fact, I did do this, here is the code:

OK, and you still receive the 'Mismatch' error after doing this...
The most obvious cause cannot be the case here (since the document is  
valid and resulted in correct output the first time), so it has to be  
the less obvious cause: somewhere upstream, an Exception occurred,  
which caused the parser to miss an endElement(), but the XSLT  
processor swallows the Exception, and FOP only discovers this much  
later, at the end of the document.

Until we know exactly what that upstream Exception is, there's  
nothing we can do to fix it, work around it or point you in the right  
direction...

Can you try forcing a different (version of) XSLT processor (i.e.  
either Saxon or a different, more recent version of Xalan) in the  
test environment? Even if this is impossible in the production  
environment, it could lead to some invaluable info. Chances are that  
it's not the base Transformer that swallows the exception, but a  
separate one (used for SVG, XMP or another piece of embedded XML,  
foreign to the FO namespace) In that respect, it may be important to  
know whether you are using any foreign XML, and if yes, whether the  
problem persists if this is removed from the document...

Also, do you know if the problem only occurs if the newer version is  
also different? (In other words: does it also occur if you re-deploy  
the exact same version that was already running?)
How exactly do you use the Transformer and TransformerFactory? Are  
they re-created with each call to the webapp, or do you use pooling  
of some sort? I'm not sure whether it's relevant here, but note that  
TransformerFactory is not thread-safe, unlike FOP's own FopFactory.


Cheers

Andreas

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