the blue mountain created PDFBOX-5369:
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Summary: PDDocument.saveIncremental () and stack exhaustion
Key: PDFBOX-5369
URL: https://issues.apache.org/jira/browse/PDFBOX-5369
Project: PDFBox
Issue Type: Bug
Components: Writing
Affects Versions: 3.0.0 PDFBox
Reporter: the blue mountain
Attachments: PDFBOX-20220126.zip
Merge of fdf annotations into pdf file exhausts stack
attempting to merge an fdf file in a pdf file, using the
PDDocument.saveIncremental () method, program stack is exhausted because of
infinite recursion.
looking further in the code, it seems the infinite recursion is being started
from the private boolean COSIncremental.collect(COSBase base) method.
i have attached a zip file carrying:
- mini.pdf: a minimal pdf file to reproduce the issue
- mini.fdf: an fdf annotation file carrying a /Text annotation and related
/Popup to reproduce the issue
- COSIncrement.java: a modified source that generate extra traces (+ possible
work-around)
- COSIncrement-fix.java: a modified source to avoid the problem
- Sample.java: a sample program that loads pdf, copies annotations and saves
incrementally.
- sample_run.xlsx: an extract of the Sample output to compare a working vs
non-working
notes:
1- I was not able to reproduce the problem using annotations created
dynamically in the code.
2- It is possible to avoid this issue by altering the COSIncrement.java class
(COSIncrement-fix.java):
it records objects beING collected through enter () method ensuring object is
not being collected multiple times
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