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https://issues.apache.org/jira/browse/PDFBOX-4346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16653793#comment-16653793
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Tilman Hausherr commented on PDFBOX-4346:
-----------------------------------------

Please attach the PDF file. Try also opening the PDF file with loadNonSeq 
instead of load.

> NPE on calling save()
> ---------------------
>
>                 Key: PDFBOX-4346
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4346
>             Project: PDFBox
>          Issue Type: Bug
>    Affects Versions: 1.8.10, 1.8.16
>            Reporter: Julian Isaac
>            Priority: Major
>
> Opening a PDF file, making some changes to the metadata (set Producer, 
> Creator), then calling save(String fileName) results in null pointer 
> exception (on some PDFs).
> java.lang.NullPointerException
>  at org.apache.pdfbox.pdmodel.PDPageNode.updateCount(PDPageNode.java:100)
>  at org.apache.pdfbox.pdmodel.PDDocument.save(PDDocument.java:1364)
>  at org.apache.pdfbox.pdmodel.PDDocument.save(PDDocument.java:1350)
>  at org.apache.pdfbox.pdmodel.PDDocument.save(PDDocument.java:1337)
>  at my.modules.utils.MetaDataUpdater.save(MetaDataUpdater.java:146)
> It's a maven project and the version of PDFBox I'm using is 1.8.16. I'm 
> trying to save back to the same file as the one I've opened...
> Not sure why it's trying to update the page count when all I'm changing is 
> the metadata?
> Seems this returns null which means the page instance variable is null, 
> resulting in the NPE when page.setLong() is called...
>     public PDPageNode getPages()
>     {
>         return new PDPageNode( (COSDictionary)root.getDictionaryObject( 
> COSName.PAGES ) );
>     }



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