How to set a custom field name for an invisible signature field - pdfbox

Question

How to set a custom field name for an invisible signature field via pdf box

I want to change from Signature1 (invisible signature) to Foo

Answer 1

Add this code after the document.addSignature() call:

document.getDocumentCatalog().getAcroForm().getField("Signature1").setPartialName("Foo");

or

for (PDSignatureField signatureField : signatureFields)
{
    if ("Signature1".equals(signatureField.getPartialName()))
    {
        signatureField.setPartialName("Foo");
        break;
    }
}