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https://issues.apache.org/jira/browse/PDFBOX-5954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17926817#comment-17926817
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Michael Klink commented on PDFBOX-5954:
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Well, it's not really an issue: If the signature is invisible, there is nothing
to show, so the appearance stream may be empty.
> Invalid stream length: 0, stream start position: <xxx>
> ------------------------------------------------------
>
> Key: PDFBOX-5954
> URL: https://issues.apache.org/jira/browse/PDFBOX-5954
> Project: PDFBox
> Issue Type: Bug
> Components: Parsing
> Affects Versions: 2.0.33, 3.0.4 PDFBox
> Reporter: Joost Konst
> Priority: Minor
> Attachments: pdfa-signed.pdf
>
>
> Ever since updating to version 2.0.33 we have been getting the following
> warning when handling PDF's with digital signatures:
> {code:java}
> Invalid stream length: 0, stream start position: xxx{code}
> It gets logged up to 10 times every time a PDF with a signature gets sent.
> This issue could be related to PDFBOX-5880 that's in the 2.0.33 release,
> because I reverted to the 2.0.32 version and the warnings disappear.
> I've attached the PDF file that seems to cause these warnings
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