[PDFBOX-3524] signatureField.setValue() not implemented

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.3
• Fix Version/s: 2.0.4, 3.0.0 PDFBox
• Component/s: Signing
• Assignee: Maruan Sahyoun
• Reporter: Tilman Hausherr
• Created: 07/Oct/16 15:23
• Updated: 25/Mar/17 18:12
• Resolved: 01/Nov/16 10:14

Description

In the CreateEmptySignatureForm example, adding

signatureField.setValue(new PDSignature());

before saving brings this

Exception in thread "main" java.lang.UnsupportedOperationException: not implemented
	at org.apache.pdfbox.pdmodel.interactive.form.PDSignatureField.constructAppearances(PDSignatureField.java:237)
	at org.apache.pdfbox.pdmodel.interactive.form.PDTerminalField.applyChange(PDTerminalField.java:226)
	at org.apache.pdfbox.pdmodel.interactive.form.PDSignatureField.setValue(PDSignatureField.java:121)
	at org.apache.pdfbox.examples.signature.CreateEmptySignatureForm.main(CreateEmptySignatureForm.java:84)

Although there's nothing to construct, visual signing is a different area of PDFBox.

What does work is this:

signatureField.getCOSObject().setItem(COSName.V, new PDSignature());

I wanted to add this line because this would make it possible to sign this specific field with PDFBox, due to the findSignatureField() method in PDDocument, which would allow to pre-fill a PDSignature object.