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https://issues.apache.org/jira/browse/PDFBOX-3891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17223830#comment-17223830
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Maruan Sahyoun commented on PDFBOX-3891:
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That's what happens here.
Loading the form with Acrobat
a) AcroForm with empty Fields array -> no form fields are created see
[^merge-test-acrobat.pdf]
b) AcroForm with empty Fields array and NeedAppearances set see
[^merge-test-na.pdf] -> form fields are created see
[^merge-test-na-acrobat.pdf]
Merge of form with Acrobat
c) always creates form fields
a) and b) are already handled by PDFBOX-4985. c) is open
> Missing data if document is merged with itself
> ----------------------------------------------
>
> Key: PDFBOX-3891
> URL: https://issues.apache.org/jira/browse/PDFBOX-3891
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm, Utilities
> Affects Versions: 2.0.7
> Reporter: Haiko Strotbek
> Priority: Major
> Attachments: MergeTest.java, merge-test-acrobat.pdf,
> merge-test-merged.pdf, merge-test-na-acrobat.pdf, merge-test-na.pdf,
> merge-test.pdf
>
>
> When using PDFMergerUtility to merge the attached PDF twice into one document
> there may be data missing.
> To be more specific: In this case the data on page 1 looks fine, but page 28
> is empty. My expectation is that page 28 is identical to page 1 (the document
> has 27 pages).
> Of course that's not a common use case. But I can reproduce this behaviour
> with other documents which are not identical, but similar.
> I think this might be related to PDFBOX-3111 and PDFBOX-3218.
> What is the trigger for this and is there a workaround?
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