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https://issues.apache.org/jira/browse/PDFBOX-4066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16327327#comment-16327327
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Maruan Sahyoun commented on PDFBOX-4066:
----------------------------------------
As the dictionary entry is cloned by {{PDCloneUtility}} it should be sufficient
to check if the root fields names are duplicates. If yes we rename it otherwise
we keep it. The child fields are handled by the cloning.
So we could change
{code}
for (PDField srcField : srcAcroForm.getFieldTree())
{code}
to
{code}
for (PDField srcField : srcAcroForm.getFields())
{code}
WDYT?
> Flatten pdf does not remove acroform elements (checkboxes)
> ----------------------------------------------------------
>
> Key: PDFBOX-4066
> URL: https://issues.apache.org/jira/browse/PDFBOX-4066
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm, Utilities
> Affects Versions: 2.0.8
> Reporter: Al Phaba
> Priority: Major
> Attachments: TestForm-flattened.pdf, TestForm.pdf, flattenAndMerge.pdf
>
>
> I have a pdf with a lot of acroforms, I do some manipulation on it which
> results in a new pdf. So I have PDF-1 (which is the original one )and PDF-2
> (just a duplication of PDF-1), now I want to merge them. Both PDFs have some
> acroforms for example: field_a, field_2...
> Before I merge them I flatten PDF-1, because I only want to have acrofields
> from PDF-2. When I check then my new merged PDF I can see that there are no
> visible fields on on the pages from PDF-1 and there are fields on pages of
> fields of PDF-2. At the first look it seems ok, but when I inspect the fields
> I can see that the merger has renamed all the fields for PDF-2 e.g.
> field_a_dummy123, field_b_dummy232 ...
> It seems to me, that flattening does not remove the fields and thats why the
> PDFMerger from PDFBox will rename the fields for PDF-2 because acrofields
> need to be unique.Another guess was that there is a bug in mergeAcroForm()
>
> {code:java}
> @Test
> public void flattenAndMerge() throws IOException {
> File testForm = new
> File(classLoader.getResource("./TestForm.pdf").getFile());
> byte[] testFormAsByte = Files.readAllBytes(testForm.toPath());
> byte[] testFormAsByte2 = Files.readAllBytes(testForm.toPath());
> PDDocument pdf1 = PDDocument.load(testFormAsByte);
> PDAcroForm acroform = pdf1.getDocumentCatalog().getAcroForm();
> acroform.flatten();
> Path flattendedPdf = Files.createTempFile("flatten", ".pdf");
> pdf1.save(flattendedPdf.toFile());
> PDFMergerUtility merger = new PDFMergerUtility();
> merger.addSource(new
> ByteArrayInputStream(Files.readAllBytes(flattendedPdf)));
> merger.addSource(new ByteArrayInputStream(testFormAsByte2));
> merger.setDestinationFileName("./build/flattenAndMerge.pdf");
> merger.mergeDocuments(MemoryUsageSetting.setupMainMemoryOnly());
> }
> {code}
> Here is my SO Article
> [https://stackoverflow.com/questions/48271924/pdfbox-flatten-pdf-does-not-remove-acroform-elements?noredirect=1#comment83544858_48271924]
>
>
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