mysterious error generating pdf file

[nico <nv...@scilearn.com>]

hello cocoon users, i am trying to solve the following problem:

** problem description *****************************************

a pdf file that is dynamically generated from xml data using the fo2pdf 
serializer
is downloaded and viewed successfully the first few attempts.

however, after repeated attempts (about a dozen) the pdf file can no 
longer be viewed by
adobe acrobat which displays the following error messages:

"there was an error processing the page. wrong number of arguments for 
the setcolor operator"

and

"an unrecognized token 'NaN' was found."


** system configuration ***************************************

the system configuration is as follows:
	cocoon 2.0.4 under jboss 3.2.0 on a linux box with java j2sdk1.4.1_02

the error appears using
	internet explorer
	on a windows xp box
	and adobe acrobat 5.

the error does *not* appear using
	internet explorer
	on os x
	and the os x native pdf viewer.


** debugging **************************************************

i've tried the following to debug/solve the problem:

1. looked at the WEB-INF/logs/error.log and noted the following errors

ERROR   (2003-07-10) 15:41.01:031   [core.manager.fop] 
(/cocoon/mywebapp/report.pdf) PoolThread-2/PageSequence: Page 
subsequences exhausted. Using previous subsequence.

ERROR   (2003-07-10) 15:41.01:032   [core.manager.fop] 
(/cocoon/mywebapp/report.pdf) PoolThread-2/MessageHandler: Unknown 
enumerated value for property 'border-bottom-style': black

2. restarted jboss, which eliminated the errors. however, after a dozen 
or so downloads the error reappears.

3. saved the downloaded report.pdf before and after the error occurs, 
and the files are different sizes.
     also, a diff text viewer indicated that the contents are different. 
however the os x viewer displays them identically.

4. before sending the fo xml stream to the fo2pdf serializer, i viewed 
the xml and it is valid, and contained no invalid data
     or characters.


** questions ****************************************************

1. does anyone know of any bugs with the fop2pdf serializer (such as 
memory leaks ) that would corrupt or damage
     a pdf file after several download/generation attempts?

2. does anyone know if upgrading to cocoon2.1 would help with this 
problem?



thanks in advance for any answers!



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Re: mysterious error generating pdf file

["J.Pietschmann" <j3...@yahoo.de>]

nico wrote:
> ERROR   (2003-07-10) 15:41.01:031   [core.manager.fop] 
> (/cocoon/mywebapp/report.pdf) PoolThread-2/PageSequence: Page 
> subsequences exhausted. Using previous subsequence.
> 
> ERROR   (2003-07-10) 15:41.01:032   [core.manager.fop] 
> (/cocoon/mywebapp/report.pdf) PoolThread-2/MessageHandler: Unknown 
> enumerated value for property 'border-bottom-style': black
..
 > 4. before sending the fo xml stream to the fo2pdf serializer, i viewed
 > the xml and it is valid, and contained no invalid data
 >     or characters.
Well, it's not quite valid, as the log entries indicate. However, they
should not cause an invalid PDF.

> 1. does anyone know of any bugs with the fop2pdf serializer (such as 
> memory leaks ) that would corrupt or damage
>     a pdf file after several download/generation attempts?

FOP has sort of memory leaks, but I'm not aware of leaks causing
PDF damage.

> 2. does anyone know if upgrading to cocoon2.1 would help with this problem?
Unlikely.

Could you try:
- reproduce the problem with another browser on Windows XP, like
  Mozilla
- eliminate images and custom fonts and check whether the problem
  persists
- if so, and if there are no confidential data, open a FOP bug and
  append the FO file

J.Pietschmann



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