[iText-questions] How to create an empty (non-signed) signature field?

[Filipe Fedalto]

Hi all,

 

How can I create an empty (non-signed) signature field using PdfStamper? My intention is to create a document with an empty signature field. The document is not to be signed at this moment. The reason is that I want the users to manually sign them later. So, I want that, when they open the document in acrobat they see the empty field so they can click on it and sign the document.

 

I tried to use:

 

  PdfStamper stamper = PdfStamper.createSignature(documentoPDF, out, '\0');

  // do something

  sap.setVisibleSignature(new Rectangle(100, 300, 60, 60), 1, "empty signature field");

  stamper.close();
 

and

 

  PdfStamper stamper = new PdfStamper(documentoPDF, out);
  // do something

  sap.setVisibleSignature(new Rectangle(100, 300, 60, 60), 1, "empty signature field");

  stamper.close();
 

But in both cases an exception is thrown, respectively:

java.lang.NullPointerException
 at com.lowagie.text.pdf.PdfSignatureAppearance.getAppearance(PdfSignatureAppearance.java:339)
 at com.lowagie.text.pdf.PdfSignatureAppearance.preClose(PdfSignatureAppearance.java :774)
 at com.lowagie.text.pdf.PdfSignatureAppearance.preClose(PdfSignatureAppearance.java:719)
 at com.lowagie.text.pdf.PdfStamper.close(PdfStamper.java:200)
 at br.com.ect.sadel.control.PreparacaoDocumentoControle.processarDocumento (PreparacaoDocumentoControle.java:223)

 

and (in this case, the sap object is null)

 

java.lang.NullPointerException
 at br.com.ect.sadel.control.PreparacaoDocumentoControle.processarDocumento(PreparacaoDocumentoControle.java:209)

 

I'm sending an example PDF file attached (no virus), created in Acrobat Standard 6.0, with an empty signature field. This is exactly what I want to generate, but using iText, not Adobe Standard. First of all, what is this "empty signature field"? Is this a form? What is it from iText point of view?

Second, is it possible to somehow create such an empty (non-signed) signature field with iText?

 

Thank you all in advance.

Filipe Fedalto

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empty_signature_field.pdf
Description: Adobe PDF document