Andreas Lehmkühler created PDFBOX-6097:
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Summary: Avoid StackOverflow when collecting indirect object keys
Key: PDFBOX-6097
URL: https://issues.apache.org/jira/browse/PDFBOX-6097
Project: PDFBox
Issue Type: Bug
Components: PDModel
Affects Versions: 3.0.5 PDFBox, 4.0.0
Reporter: Andreas Lehmkühler
Assignee: Andreas Lehmkühler
Kiran Kandel reports an issue on [Stackoverflow |
https://stackoverflow.com/questions/79815248/stack-overflow-when-collecting-indirect-object-keys-from-recursive-pdf-structure]
The following code sample results in a StackoverflowException
{code}
PDDocument document = new PDDocument();
PDPage page = new PDPage(PDRectangle.A4);
// Create AcroForm
PDAcroForm acroForm = new PDAcroForm(document);
document.getDocumentCatalog().setAcroForm(acroForm);
// Create a single text field
PDTextField textField = new PDTextField(acroForm);
textField.setPartialName("testField");
PDAnnotationWidget widget = textField.getWidgets().get(0);
widget.setRectangle(new PDRectangle(100, 700, 200, 20));
widget.setPage(page);
page.getAnnotations().add(widget);
acroForm.getFields().add(textField);
// Adding page AFTER creating form fields causes StackOverflowError
document.addPage(page);
document.save("output.pdf");
document.close();
{code}
[~tilman] already found the reason for the issue. The method in question
detects and skips parent references to avoid recursion. This works fine as long
as the key PARENT is used. In combination with annotations the abbreviated key
P is used but isn't detected.
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