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https://issues.apache.org/jira/browse/PDFBOX-4556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16851711#comment-16851711
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Tilman Hausherr commented on PDFBOX-4556:
-----------------------------------------
The stacktrace is missing the line numbers. So I can see it fails in
{{COSWriter.visitFromStream}} but not where. You did also not mention what
exact version you are using.
Your code is incomplete. To find out why this NPE comes, and whether it is a
bug or not, I'd also need something runnable on java. Alternatively tell me the
parameter values for createVisualSignatureTemplate.
As I wrote in PDFBOX-4312, you need to start with the CreateVisibleSignature
example from the source code download. I also wrote "{color:#333333}please
don't open an issue if you are using IKVM. It isn't supported, and as this
issue has shown, doesn't work{color}", yet you are using .NET code and thus
likely IKVM.
Some parts are definitively wrong. e.g.
{code:java}
new
PDAppearanceDictionary(signedDoc.getDocumentCatalog().getCOSDictionary());{code}
You're passing the document catalog to an appearance dictionary?! Just use the
no-parameter constructor.
Also attach the target PDF file, i.e. the unfinished file. By having a look at
the bottom one might know what COSStream has a problem.
> how the visual representation of the signature is achieved
> ------------------------------------------------------------
>
> Key: PDFBOX-4556
> URL: https://issues.apache.org/jira/browse/PDFBOX-4556
> Project: PDFBox
> Issue Type: Wish
> Components: .NET
> Reporter: bal
> Priority: Major
>
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