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https://issues.apache.org/jira/browse/PDFBOX-2596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14281109#comment-14281109
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John Hewson commented on PDFBOX-2596:
-------------------------------------
True, but it makes no difference here, because those children are holding
references to streams which have been closed (either manually via close() or by
the finalizer). Every PDPage is backed by a COSStream, which is backed by a
COS/PDDocument. Once that document is closed, your COSStreams are dead. The NPE
which you're getting was fixed in the trunk by PDFBOX-2592, it's now an
IOException which explains that you're trying to read from a closed stream.
> NullPointerException in RandomAccessFileInputStream
> ---------------------------------------------------
>
> Key: PDFBOX-2596
> URL: https://issues.apache.org/jira/browse/PDFBOX-2596
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 1.8.8
> Reporter: John Roche
>
> Line 94 contains a synchronized(file) that throws a NullPointerException
> under some strange circumstances that I haven't been able to fully identify
> yet. I have downloaded the 1.8.8 source and the fix I used is simply to add
> "&& file != null" to the previous if statement.
> I can reproduce this bug with live user data, but I haven't been able to with
> test data yet. It happens when I try to create a pdf with 36 pages that have
> an image, some drawn coloured boxes and some text, on each page. If I remove
> some of the pages before I call save(File) it doesn't happen - depending on
> which pages I remove it can be ok with up to 26 pages, or break with fewer.
> Quite strange. I suspect it's to do with the size of the data as opposed to
> the number of pages.
> I will continue to investigate, since there seems to be some underlying
> issue, but for now I guess the null protection should be ok to add?
> Thanks,
> John
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