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https://issues.apache.org/jira/browse/PDFBOX-737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12874615#action_12874615
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Adam Nichols commented on PDFBOX-737:
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I believe the issue was that it was reading an object where the same ID
appeared twice. Once it looked like a normal page, and the other time it
looked like a document outline. I'm not sure if having multiple objects with
the same ID is valid or not (I suspect that it is out of spec), but I've found
that it happens rather often when PDFs are merged as some programs seems to
just concatenate one PDF after another.
> Fix potential NullPointer exception in PDPageNode
> -------------------------------------------------
>
> Key: PDFBOX-737
> URL: https://issues.apache.org/jira/browse/PDFBOX-737
> Project: PDFBox
> Issue Type: Bug
> Components: Parsing
> Affects Versions: 0.7.0, 0.7.1, 0.7.2, 0.7.3, 0.8.0-incubator, 1.0.0, 1.1.0
> Environment: Windows Vista 32-bit, Java 1.5, HEAD tag of PDFBox
> Reporter: Adam Nichols
> Fix For: 1.2.0
>
> Attachments: PDFBOX-737.patch
>
>
> getAllKids(List result, COSDictionary page, boolean recurse) throws a
> NullPointerException when page.getDictionaryObject( COSName.KIDS ) returns
> null. I have a PDF where this actually happens but I can not provide it due
> to the confidential information it contains. I confirmed that once I added
> the null check that the code worked as expected (the documents I was merging
> were visible, the page count was correct, etc.). Patch will be attached
> momentarily.
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