pdfsam is the software I'm maintaining and it uses PdfCopy to concatenate
documents. A user reported me this issue so I made some tests using the
examples found here:
http://itextdocs.lowagie.com/tutorial/general/copystamp/index.php and I
found that Ghostscript (and others) complains also opening the
concatenated.pdf document generated with the
com.lowagie.examples.general.copystamp.Concatenate.java class.


Paulo Soares-3 wrote:
> 
> I don't see any pdfsam in the iText sources.
> 
> Paulo 
> 
>> -----Original Message-----
>> From: Andrea Vacondio [mailto:andrea.vacon...@gmail.com] 
>> Sent: Wednesday, May 20, 2009 3:29 PM
>> To: itext-questions@lists.sourceforge.net
>> Subject: [iText-questions] PdfCopy and xref problems
>> 
>> A user reported that Ghostscript and other softwares 
>> complains about an invalid xref entry in documents generated 
>> using pdfsam merge command. I made some test using the 
>> provided PdfCopy example and here is the Ghostscript error:
>> 
>> GPL Ghostscript 8.64 (2009-02-03)
>> Copyright (C) 2009 Artifex Software, Inc.  All rights reserved.
>> This software comes with NO WARRANTY: see the file PUBLIC for details.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  Generation number out of 0..65535 range, assuming 0.
>>    **** Warning:  File has an invalid xref entry:  1.  
>> Rebuilding xref table.
>> Processing pages 1 through 19.
>> Page 1
>> 
>> To reproduce it simply run Ghostscript against the 
>> concatenated.pdf provided with the PdfCopy example on 
>> http://itextdocs.lowagie.com. The error disappear setting 
>> enabling full compression on the writer.
>> I attached a couple of images showing other softwares 
>> reporting about the xref table.
>> 
>> 
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