Files are here:
https://drive.google.com/drive/folders/1jo4g-ElaMB15Hh1lW9B04DxWKSXramvL?usp=sharing
The error is "widget annotation not nested inside a Form structure element".
What I suspect: each annotation needs a /StructParent number, and these
numbers must be in the Parent tree and in the K tree. The best would be
to have a compliant file so that we can see what needs to be done.
I did something like that here:
https://stackoverflow.com/questions/79083813/how-to-add-the-annotation-tag-in-tagged-pdf-using-pdfbox
However your case is even more difficult, you have to do it while
signing and make sure that the changes are included in the incremental save.
Tilman
Am 29.04.2026 um 15:20 schrieb Dietrich, Neonila:
Hello again,
Unfortunately, we are not allowed us to use file-sharing services in
our company.
If you know of another way to send the files to the community, please
let us know.
Thanks for your support
Neonila Dietrich
Developer
--
*Governikus GmbH & Co. **KG*
Hochschulring 4
28359 Bremen, Germany
Telefon: +49 421 204 95 - 0
E-Mail: [email protected]
www.governikus.de <https://www.governikus.de/>
*Von:*Tilman Hausherr <[email protected]>
*Gesendet:* Mittwoch, 29. April 2026 14:36
*An:* [email protected]
*Betreff:* Re: PDF-UA-compliance error by creating of signature fields
in pdfbox version higher than 2.0.31
ACHTUNG:Diese E-Mail stammt von einem externen Absender. Bitte
vermeide es, Anhänge oder externe Links zu öffnen.
Hi,
Please upload the files to a sharehoster that doesn't require
registration.
Are you saying that it did work with 2.0.30 ? If so, then include
these as well.
Tilman
Am 29.04.2026 um 14:31 schrieb Dietrich, Neonila:
Hello pdfbox community,
since Apache PDFBox version 2.0.31, we are not able to generate
PDF-UA-compliant signature fields. We are attaching a code snippet
that we use to create visible signature fields. Please let me know
what I need to change in this code so that the PDF document
remains PDF-UA-compliant. We verify PDF-UA compliance by using the
PAC APP ( https://www.axes4.com/de <https://www.axes4.com/de> )
Two sample documents are attached to this email: original and
result with signatures fields.
/** used with pdfbox 2.0.36 */
public static void main(String[] args)
{
File inputFile = new File("PDF_UA_original.pdf");
File outputFile = new File("result.pdf");
float xPos = 50;
float yStart = 600;
float width = 200;
float high = 50;
float distance = 70;
try (PDDocument doc = PDDocument.load(inputFile))
{
PDDocumentCatalog documentCatalog = doc.getDocumentCatalog();
PDPageTree allPages = documentCatalog.getPages();
PDPage pdPage = allPages.get(0);
PDAcroForm acroForm = documentCatalog.getAcroForm();
if (acroForm == null)
{
acroForm = new PDAcroForm(doc);
documentCatalog.setAcroForm(acroForm);
}
for ( int i = 0 ; i < 4 ; i++ )
{
PDSignatureField pdSignatureField = new PDSignatureField(acroForm);
pdSignatureField.setPartialName("SigField_" +
UUID.randomUUID().toString());
pdSignatureField.setAlternateFieldName("Alt_" +
pdSignatureField.getPartialName());
float currentY = yStart - (i * distance);
PDRectangle rectangle = new PDRectangle(xPos, currentY,
width, high);
PDAnnotationWidget widget = pdSignatureField.getWidgets().get(0);
widget.setRectangle(rectangle);
PDAppearanceDictionary pdAppearanceDictionary = new
PDAppearanceDictionary();
PDAppearanceStream appearanceStream = new PDAppearanceStream(doc);
pdAppearanceDictionary.setNormalAppearance(appearanceStream);
widget.setAppearance(pdAppearanceDictionary);
widget.setPage(pdPage);
acroForm.getFields().add(pdSignatureField);
pdPage.getAnnotations().add(widget);
pdPage.getCOSObject().setNeedToBeUpdated(true);
doc.getSignatureFields().add(pdSignatureField);
}
doc.save( outputFile );
}
catch (Exception e)
{
e.printStackTrace();
}
}
Best regards,
Thank you very much for your support
Neonila Dietrich
Developer
--
*Governikus GmbH & Co. **KG*
Hochschulring 4
28359 Bremen, Germany
Telefon: +49 421 204 95 - 0
E-Mail: [email protected]
www.governikus.de <https://www.governikus.de/>
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