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https://issues.apache.org/jira/browse/PDFBOX-5344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17460490#comment-17460490
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Laurence Urbain commented on PDFBOX-5344:
-----------------------------------------
[~mkl]
I was not considering all these aspects, thanks for the explanation, it makes
total sense.
[~tilman]
Thanks, I'm gonna try this approach.
{quote}
What we could do is to improve the signing examples to catch this corner case
(by using the {{PDAcroform.getFields()}} method which gets the root level
fields) so that people notice it and change their code accordingly.
{quote}
I was not aware of these nested fields until recently, adding this logic to the
examples could definitely help noticing the field hierarchy.
> 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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