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https://issues.apache.org/jira/browse/PDFBOX-4814?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17084798#comment-17084798
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Andreas Küllinger commented on PDFBOX-4814:
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We try to reproduce it with test files.
> Wrong COSType for OCProperties after merge
> ------------------------------------------
>
> Key: PDFBOX-4814
> URL: https://issues.apache.org/jira/browse/PDFBOX-4814
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 2.0.19
> Reporter: Andreas Küllinger
> Priority: Major
>
> If you merge a PDF document with OCProperties to a PDF document without
> OCProperties, the result of the merge is that the OCProperties type is no
> longer a COSDictionary but a COSObject. If a third document with OCProperties
> is merged with the previously created merge result, this leads to the
> following ClassCastException:
> org.apache.pdfbox.cos.COSObject cannot be cast to
> org.apache.pdfbox.cos.COSDictionary at
> org.apache.pdfbox.multipdf.PDFCloneUtility.cloneMerge(PDFCloneUtility.java:227)
> at
> org.apache.pdfbox.multipdf.PDFCloneUtility.cloneMerge(PDFCloneUtility.java:229)
> at
> org.apache.pdfbox.multipdf.PDFMergerUtility.appendDocument(PDFMergerUtility.java:730)
> at pdfboxtest.Test.main(Test.java:38)
> According to PDF Specification, OCProperties is always a dictionary.
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