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https://issues.apache.org/jira/browse/PDFBOX-2596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14280337#comment-14280337
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Tilman Hausherr commented on PDFBOX-2596:
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There is a log warning when documents are closed by the finalizer.
> 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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