[PDFBOX-5369] PDDocument.saveIncremental () and stack exhaustion

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.0.0 PDFBox
• Component/s: Writing
• Assignee: Unassigned
• Reporter: the blue mountain
• Created: 26/Jan/22 12:56
• Updated: 27/Feb/22 14:38

Description

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