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https://issues.apache.org/jira/browse/PDFBOX-5344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17460049#comment-17460049
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Tilman Hausherr commented on PDFBOX-5344:
-----------------------------------------
Sorry, wrong issue. Your problem is a tricky one, the field doesn't have a
parent pointer (and if it had, it would mean the entire tree would end up in
the increment). The alternative would be to use the other saveIncremental()
call which allows specific objects. But there I'm scared that we mess something
up.
> Adding a signature on nested fields has no effect
> -------------------------------------------------
>
> Key: PDFBOX-5344
> URL: https://issues.apache.org/jira/browse/PDFBOX-5344
> Project: PDFBox
> Issue Type: Bug
> Components: Signing
> Affects Versions: 2.0.24
> Reporter: Laurence Urbain
> Priority: Major
> Attachments: nested-signature-field.pdf
>
>
> Hi,
> I am not able add a signature to a document if the signature field is nested
> (the signature field is not a direct child of the acro form).
> When I call the method PDDocument.addSignature(), the signature field is
> properly marked as "needs to be updated" but not its parents.
> As a result, when the incremental save is done, the changes are lost.
> To be able to add the signature for such field, all the parent fields in the
> hierachy should also be marked as "needs to be updated".
> Please find a sample file attached.
> Here is the code snippet to build it:
> {code:java}
> final PDDocument pdDocument = new PDDocument();
> final PDPage page = new PDPage();
> pdDocument.addPage(page);
> PDAcroForm form = new PDAcroForm(pdDocument);
> pdDocument.getDocumentCatalog().setAcroForm(form);
> final PDNonTerminalField level1 = new PDNonTerminalField(form);
> level1.setPartialName("level1");
> form.getFields().add(level1);
> final PDNonTerminalField level2 = new PDNonTerminalField(form);
> level2.setPartialName("level2");
> level1.setChildren(List.of(level2));
> final PDSignatureField signatureField = new PDSignatureField(form);
> signatureField.setPartialName("field1");
> PDAnnotationWidget widget = signatureField.getWidgets().get(0);
> widget.setRectangle(new PDRectangle(50, 700, 200, 20));
> widget.setPage(page);
> widget.setPrinted(true);
> page.getAnnotations().add(widget);
> level2.setChildren(List.of(signatureField)); {code}
> Thanks
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