Jacobo Aragunde created PDFBOX-6061:
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Summary: NullPointerException in COSDictionary
Key: PDFBOX-6061
URL: https://issues.apache.org/jira/browse/PDFBOX-6061
Project: PDFBox
Issue Type: Bug
Affects Versions: 3.0.5 PDFBox
Reporter: Jacobo Aragunde
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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