This area was extensively changed in 5.0.3 (when it's out this weekend but you
can get it from the SVN), it would be worth to see if the problem is already
fixed.
Paulo
-----Original Message-----
From: Gylfi Ingvason [mailto:[email protected]]
Sent: Wednesday, August 04, 2010 4:52 PM
To: [email protected]
Subject: [iText-questions] Null pointer exception in PdfWriter
Gents,
I'm using an older version of iTextSharp (4.1.6 equivalent), and recently
ran into a null pointer exception in PdfWriter while splitting a PDF file.
Never seen this before despite running all kinds of data for years. The
error happens on the PdfDocument Close() call, that leads to a
RotateAnnotations call, that calls writer.AddToBody, and eventually
GetNewObjectNumber in the PdfWriter is called and that method looks like
this:
protected internal virtual int GetNewObjectNumber(PdfReader reader, int
number, int generation) {
return currentPdfReaderInstance.GetNewObjectNumber(number, generation);
}
At the time the call is made, the currentPdfReaderInstance is null causing
the exception. I looked at the code in the repository for the latest, and
this method has not changed. I patched the code to check for null as such:
protected internal virtual int GetNewObjectNumber(PdfReader reader, int
number, int generation) {
if (currentPdfReaderInstance == null) {
currentPdfReaderInstance = reader.GetPdfReaderInstance(this);
}
return currentPdfReaderInstance.GetNewObjectNumber(number, generation);
}
This creates proper output. My question is, is this an acceptable patch or
should this be handled differently? Furthermore, it worries me that this has
not come up before - is it normal that the currentPdfReaderInstance is null
under these circumstances? I have not tried this under 5.0.2 but I suspect
that the same thing will happen - would it make sense to patch the latest?
Any feedback would be appreciated.
Thanks - Gylfi
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