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https://issues.apache.org/jira/browse/PDFBOX-5962?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17929348#comment-17929348
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Maruan Sahyoun commented on PDFBOX-5962:
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we could add that to the repair mechanism - WDYT?
> Saving PDDocument with flattened form retains fields
> ----------------------------------------------------
>
> Key: PDFBOX-5962
> URL: https://issues.apache.org/jira/browse/PDFBOX-5962
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 3.0.4 PDFBox
> Environment: Java 21
> Reporter: Rune Flobakk
> Priority: Major
> Attachments: form-problem.pdf
>
>
> I believe I may have found a bug or at least a certain change in behavior
> introduced in v3.0.4.
> For some PDAcroForms, after flattening the form, they seem to somehow retain
> their fields when saving the PDDocument. {{PDAcroForm.getFields()}} is an
> empty list after flattening (as I believe is expected), but when saving the
> {{{}PDDocument{}}}, and re-reading the saved file {{PDAcroForm.getFields()}}
> contains the fields of the form before it was flattened. Opening the saved
> file in a PDF viewer also shows the form as editable.
> The flattening works as expected in v3.0.3, and the form becomes non-editable
> with the values displayed as expected.
> I notice for this particular PDF I am testing with, there are a lot of
> logging like this in v3.0.4 when invoking {{{}.flatten(){}}}:
> {code:java}
> WARN missing /P entry (page reference) in a widget for field: ... {code}
> So there are apparently some issues with the particular PDF, though it worked
> as expected in v3.0.3. I see this logging was introduced here:
> [https://github.com/apache/pdfbox/commit/e49649ae89c913058c1be79bec6b4f561fc1f0b6]
> which is part of PDFBOX-5225. The {{.flatten()}} invocation succeeds in both
> versions, but the flattening operation seem to not be effective in the saved
> PDF file when using v3.0.4.
> I have made a small project demonstrating the problem here:
> [https://github.com/runeflobakk/pdfbox-flatten-form-save-issue]
> There is a {{FlattenFormTest}} JUnit test demonstrating the process for both
> a problematic PDF and one which works as expected. Changing the pdfbox
> dependency version to 3.0.3 makes both tests pass. The saved files appears in
> the target directory for inspection.
> Thank you, and please let me know if there are any details I may have left
> out!
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