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https://issues.apache.org/jira/browse/PDFBOX-5586?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andreas Lehmkühler resolved PDFBOX-5586.
----------------------------------------
    Resolution: Fixed

I've added two null checks based on Matts proposal

> NullPointerException when closing RandomAccessReadMemoryMappedFile more than 
> once
> ---------------------------------------------------------------------------------
>
>                 Key: PDFBOX-5586
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-5586
>             Project: PDFBox
>          Issue Type: Bug
>          Components: IO
>    Affects Versions: 3.0.0 PDFBox
>            Reporter: Andreas Lehmkühler
>            Assignee: Andreas Lehmkühler
>            Priority: Major
>             Fix For: 3.0.0 PDFBox
>
>
> Matt Bamberger posted an error on users@pdfbox.a.o
> {quote}
> I'm using pdfbox 3.0.0-alpha3
> When I use a RandomAccessReadMemoryMappedFile to load a PDDocument, I get a 
> NullPointerException when I close it after the PDDocument is closed:
> {code}
> try (RandomAccessReadMemoryMappedFile reader = new 
> RandomAccessReadMemoryMappedFile(file)) {
>   try (PDDocument doc = Loader.loadPDF(reader, null, null, null, null)) {
>     // ...
>   }
> }
> {code}
> I found that it's because this.mappedByteBuffer is already null the second 
> time around, so I think you can just wrap in a not-null check:
> {code}
> public void close() throws IOException {
>   if (this.fileChannel != null) {
>     this.fileChannel.close();
>   }
>   if (this.mappedByteBuffer != null) { // add this
>     Optional.ofNullable(this.unmapper).ifPresent((u) -> {
>       u.accept(this.mappedByteBuffer); // exception is thrown in here
>     });
>     this.mappedByteBuffer = null;
>   }
> }
> {code}
> {quote}



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