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https://issues.apache.org/jira/browse/PDFBOX-6061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18018354#comment-18018354
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Jacobo Aragunde commented on PDFBOX-6061:
-----------------------------------------
I suspected so, because it was hard to hand-craft a reproducer :D I would have
preferred to report the problem to the software that generated that PDF in
first place, unfortunately that's out of my reach.
Thanks for your time!
> NullPointerException in COSDictionary
> -------------------------------------
>
> Key: PDFBOX-6061
> URL: https://issues.apache.org/jira/browse/PDFBOX-6061
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.34, 3.0.5 PDFBox
> Reporter: Jacobo Aragunde
> Assignee: Tilman Hausherr
> Priority: Minor
> Fix For: 2.0.35, 3.0.6 PDFBox, 4.0.0
>
> Attachments: empty-reproducer.pdf
>
>
> Load the attached PDF file and try to add some text, {*}reusing the PDFont
> object{*}. This code would reproduce the problem:
>
> void convert(OutputStream outputStream) \{
> PDDocument document = Loader.loadPDF(new
> File('C:\\path\\to\\empty-reproducer.pdf'))
> PDPage page = document.getPage(0)
> new PDPageContentStream(document, page,
> PDPageContentStream.AppendMode.APPEND, false, false).withCloseable {
> contentStream ->
> String text = 'this is some text'
> PDFont myFont = new
> PDType1Font(Standard14Fonts.FontName.HELVETICA)
> contentStream.beginText()
> contentStream.setFont(myFont, 12)
> contentStream.newLineAtOffset(25, 0)
> contentStream.showText(text)
> contentStream.endText()
> contentStream.beginText()
> contentStream.setFont(myFont, 12) // <-- Crash
> contentStream.newLineAtOffset(25, 25)
> contentStream.showText(text)
> contentStream.endText()
> }
> document.save(outputStream)
> }
> The second call to `setFont` will produce this error:
> Exception in thread "main" java.lang.NullPointerException: Cannot invoke
> "Object.equals(Object)" because the return value of
> "org.apache.pdfbox.cos.COSObject.getObject()" is null
> at
> org.apache.pdfbox.cos.COSDictionary.getKeyForValue(COSDictionary.java:110)
> at org.apache.pdfbox.pdmodel.PDResources.add(PDResources.java:714)
> at org.apache.pdfbox.pdmodel.PDResources.add(PDResources.java:598)
> at
> org.apache.pdfbox.pdmodel.PDAbstractContentStream.setFont(PDAbstractContentStream.java:218)
> at
> org.apache.pdfbox.pdmodel.PDPageContentStream.setFont(PDPageContentStream.java:37)
> The PDF file has been hand-crafted to produce this error, sadly I cannot
> share the original reproducer. The source of the problem is a null reference
> in the Font section of the Resources dictionary. The second time we run
> `setFont`, the font already exists in the dictionary, so it iterates all the
> elements trying to retrieve the item and crashes on the null reference.
>
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