Hello and good morning,
I'm trying to find out the reasons why my web application is working
properly in my development system but not in my production system.
The web application allows a tutor to upload some exercise material as
PDF. That document gets some text- and barcode-data stamped to the
bottom of every page. Then a generic first page with some form fields is
filled out by the application and the uploaded and stamped document is
added to that first page, creating the wanted production result: an
exercise with a generic first page, containing some delivery and
handling data about a certain course (title, id number, article code
etc.), with some further data added to the bottom of every page of the
exercises.
That application was implemented last summer and has worked for hundreds
of such processed, all without any errors so far (at least after I
removed the first errors of the first release).
Yesterday one tutor reported that the web application created a
erroneous result from his PDF exercise material. He send me the original
documents and I repeated the process myself on the production system and
my similar development installation on my own server.
Result: on the production system the original content seems to blank out
(it disappears), the form fields are the only remaining elements shown,
but the fonts are wrong) one field was defined to use a barcode font,
now it is shown as plain text.
As the created document has he right page number and is quite big, I
believe that the content is still there, but something in the original
PDF and the changes done it using iText has rendered some parts useless.
There are no error message when displaying the problematic document with
Acroread 8 (Linux and Windows).
The document is produced correctly when I use my development
installation. So I'm searching for the responsible differences between
the installations and the problematic original document and other documents.
So far, I have found the following differences:
1. The development installation runs on an SUN x86 architecture with the
following Java version (output of java -version):
java version "1.5.0_12"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_12-b04)
Java HotSpot(TM) Server VM (build 1.5.0_12-b04, mixed mode)
The productions installation runs on an older SUN UltraSparc
architecture wuth teh following Java version:
java version "1.5.0_02"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_02-b09)
Java HotSpot(TM) Server VM (build 1.5.0_02-b09, mixed mode)
2. The typical PDF documents that I work have the document property:
Application: PScript5.dll Version 5.2.2
PDF Producer: Acrobat Distiller 8.1.0 (Windows)
PDF Version: 1.6 (Acrobat 7.x)
The PDF Producer and the PDF Version sometimes differ slighty in the
version numbers.
The problematic document has the following document property:
Application: Adobe Acrobat 8.1 Combine Files
PDF Producer: Acrobat Distiller 8.1.0 (Windows)
PDF Version: 1.6 (Acrobat 7.x)
The only difference I can see so far is the application property.
Maybe someone knows about the possible reasons for that problem and can
give me some hint. If you need further details, just ask.
Thank you in advance,
Oliver Schönwald
--
Oliver Schönwald, Diplom-Informatiker
FernUniversität Hagen
Zentrum für IT und Medien (ZMI) - Competence Center Anwendungsentwicklung
Universitätsstr.21/AVZ - 58084 Hagen - Deutschland
fon: +49 2331 987 1721 - email: [email protected]
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