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From "Oliver Mannion (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PDFBOX-4521) Missing Info value from file trailer: org.apache.pdfbox.cos.COSName cannot be cast to org.apache.pdfbox.cos.COSDictionary
Date Sun, 21 Apr 2019 04:20:00 GMT

    [ https://issues.apache.org/jira/browse/PDFBOX-4521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16822623#comment-16822623

Oliver Mannion commented on PDFBOX-4521:

Thank you [~tilman] for a super fast fix! 🙏

I've verified org.apache.pdfbox:pdfbox:2.0.16-20190420.123304-37 from [https://repository.apache.org/content/groups/snapshots/]
can parse [^Editathon_cheat_sheet_(EN)_MetaDefender.pdf] We'll have to upgrade to that version
from pdfbox 2.0.6 (which we are still using because of org.apache.tika:tika-parsers:1.16)
or backport the fix if we can't upgrade.

I'll raise this with our vendor. I only had a quick look at the PDF spec, does it consider
a missing Info value from file trailer to be an incorrect PDF? I'm still able to open it in
a PDF viewer.

> Missing Info value from file trailer: org.apache.pdfbox.cos.COSName cannot be cast to
> -------------------------------------------------------------------------------------------------------------------------
>                 Key: PDFBOX-4521
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4521
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Parsing
>    Affects Versions: 2.0.15
>            Reporter: Oliver Mannion
>            Assignee: Tilman Hausherr
>            Priority: Major
>             Fix For: 2.0.16, 3.0.0 PDFBox
>         Attachments: Editathon_cheat_sheet_(EN).pdf, Editathon_cheat_sheet_(EN)_MetaDefender.pdf
>   Original Estimate: 24h
>  Remaining Estimate: 24h
> The following exception
> {code:java}
> Cause: java.lang.ClassCastException: org.apache.pdfbox.cos.COSName cannot be cast to
org.apache.pdfbox.cos.COSDictionary at org.apache.pdfbox.pdmodel.PDDocument.getDocumentInformation(PDDocument.java:740)
at org.apache.tika.parser.pdf.PDFParser.extractMetadata(PDFParser.java:242) at org.apache.tika.parser.pdf.PDFParser.parse(PDFParser.java:154)
at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280) at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280)
at org.apache.tika.parser.AutoDetectParser.parse(AutoDetectParser.java:135){code}
> is generated by PDF documents that have no value in the file trailer for the {{Info}}
key, eg:
> {code:java}
> << /Size 50/Root 8 0 R/Info /ID >>
> {code}
> According to the [PDF spec|http://wwwimages.adobe.com/www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/pdf_reference_1-7.pdf] the
{{Info}} key is optional. PDFBox correctly handles the case when there is no {{Info}} key
and no value is present, but in this case, the key is present but without a value.

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