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https://issues.apache.org/jira/browse/PDFBOX-5151?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andreas Lehmkühler resolved PDFBOX-5151.
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Resolution: Fixed
Thanks [~tilman] set resolved again
> Issue with COSObjectKey::fixGeneration
> --------------------------------------
>
> Key: PDFBOX-5151
> URL: https://issues.apache.org/jira/browse/PDFBOX-5151
> Project: PDFBox
> Issue Type: Bug
> Components: Parsing
> Affects Versions: 2.0.23, 3.0.3 JBIG2
> Reporter: Roland Meub
> Assignee: Andreas Lehmkühler
> Priority: Major
> Fix For: 2.0.24, 3.0.0 PDFBox
>
> Attachments: pdfbox-fixGeneration-bugfix.patch
>
>
> I think, I've just found a little bug within
> COSParser::validateXrefOffsets, which occures when a xref generation is
> corrected using COSObjectKey::fixGeneration.
>
> The issue is, that COSObjectKey is used as a hash-key and this instance
> is modified with fixGeneration.
> Because of this modification, the hasCode of the COSObjectKey is changed
> and the associated hashmap entry cannot longer be found in the xrefTable.
> Hashmap key objects should better be immutabel (see
> [https://howtodoinjava.com/java/collections/hashmap/design-good-key-for-hashmap/])
>
> According to the change history, this issue was introduced with a commit
> for PDFBOX-4153, but PDFBOX-4490 seems also be related.
>
> Attached patch-file contains bot, the bugfix and the proposed optimization
> within COSObjectKey.
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