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https://issues.apache.org/jira/browse/PDFBOX-2470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14196837#comment-14196837
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Tilman Hausherr commented on PDFBOX-2470:
-----------------------------------------
Did you try Johns suggestion? I.e. change this:
{code}
// read and set Appearance Dictionary
PDAppearanceDictionary ap =
new
PDAppearanceDictionary((COSDictionary)cosBaseDict.getItem(COSName.AP));
{code}
to this:
{code}
PDAppearanceDictionary ap =
new
PDAppearanceDictionary((COSDictionary)cosBaseDict.getDictionaryObject(COSName.AP));
{code}
> Exception in PDDocument.addSignature(PDSignature sigObject,
> SignatureInterface signatureInterface, SignatureOptions options))
> -----------------------------------------------------------------------------------------------------------------------------
>
> Key: PDFBOX-2470
> URL: https://issues.apache.org/jira/browse/PDFBOX-2470
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 1.8.7
> Reporter: Huynh
> Labels: patch
> Fix For: 1.8.8, 2.0.0
>
> Attachments: fichedescriptiveformulaire_8954_signed.pdf
>
>
> Hi
> I have made the following modifications to avoid ClassCastException or
> NullPointerException in addSignature(PDSignature sigObject,
> SignatureInterface signatureInterface, SignatureOptions options) :
> {code}
> // read and set Appearance Dictionary
> // MOD_CS
> // PDAppearanceDictionary ap =
> // new
> PDAppearanceDictionary((COSDictionary)cosBaseDict.getItem(COSName.AP));
> // ap.getDictionary().setDirect(true);
> // signatureField.getWidget().setAppearance(ap);
> COSBase item = cosBaseDict.getItem(COSName.AP);
> if (item instanceof COSObject) {
> item = ((COSObject) item).getObject();
> }
> if (item instanceof COSDictionary) {
> PDAppearanceDictionary ap = new
> PDAppearanceDictionary((COSDictionary) item);
> ap.getDictionary().setDirect(true);
> signatureField.getWidget().setAppearance(ap);
> }
>
> // read and set AcroForm DefaultRessource
> COSBase dr = cosBaseDict.getItem(COSName.DR);
> // MOD_CS
> if (dr != null) {
> dr.setDirect(true);
> dr.setNeedToBeUpdate(true);
> acroFormDict.setItem(COSName.DR, dr);
> }
> {code}
> Regards
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