I debbuged through the code and it seems that the
'removeField' method removes the Field itself from the PDF but the
reference is not removed from the field array (/Fields and then
/Kids[..]).
Thus when i read the file again i get an PDF.Null Object and the ids of
the (removed) fields are still in the FIELDS Array but does not have an
actual match...
Could this be a bug or am i doing something wrong?
Thanks
ToM
> Hi,
>
> i want to remove all (unsigned) signatures from an PDF.
> That itself works fine but afterwards if i access the AcroForm Object
> i
> always get null / Nullpointer Exception.
> If i do Step 2. before Step 1. all works fine.
> What is the reason for that? (Because i changed the AcroFields in
> advance?).
>
> //1. Remove some fields (signature fields)
> AcroFields acroFields = this.stamper.getAcroFields();
> ArrayList al = acroFields.getBlankSignatureNames();
>
> for (int i = 0; i < al.size(); i++) {
> acroFields.removeField((String)al.get(i));
> }
>
> //2. Then fetch the AcroForm but a Nullpointer occurs
> PRAcroForm form = this.reader.getAcroForm();
> form.put(PdfName.SIGFLAGS,new PdfNumber(0));
>
>
> So if i want to remove the signatures and then set the 'SigFlags' how
> can this be done?
> And a general question: The reader can not be reused but the stamper
> can?
>
> Regards,
> ToM
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