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https://issues.apache.org/jira/browse/PDFBOX-5714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17811497#comment-17811497
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Andreas Lehmkühler commented on PDFBOX-5714:
--------------------------------------------
COSWriter detected duplicate objects and replaced the keys but it was able to
replace the key of the indirect objects referencing those objects. I've fixed
that so that the given test works fine
> PDFBox 3.0 regression: duplicate references in dictionary values
> ----------------------------------------------------------------
>
> Key: PDFBOX-5714
> URL: https://issues.apache.org/jira/browse/PDFBOX-5714
> Project: PDFBox
> Issue Type: Bug
> Components: Writing
> Affects Versions: 3.0.0 PDFBox
> Environment: macOS 14, Java 11
> Reporter: Derek Wickern
> Assignee: Andreas Lehmkühler
> Priority: Major
> Labels: regression
> Fix For: 3.0.2 PDFBox, 4.0.0
>
> Attachments: PdfboxAnnotationRegressionTest.java,
> basic-sticky-note.fdf, out-pdfbox2.pdf, out-pdfbox3.pdf, w4.pdf
>
>
> {{basic-sticky-note.fdf}} contains an Acrobat "sticky note", which consists
> of two annotations: text (2 0 obj) and popup (3 0 obj). The annotations
> reference each other. The text annotation's "/Popup 3 0 R" references the
> popup annotation. The popup's "/Parent 2 0 R" references the text annotation.
>
> {code:java}
> 2 0 obj
> <<... /Popup 3 0 R ...>>
> endobj
> 3 0 obj
> <<... /Parent 2 0 R ...>>
> endobj
> {code}
>
> The attached Java program copies those annotations onto {{{}w4.pdf{}}}, saves
> the file, then reads it back to verify the result.
> h3. Expected Behavior
> {{out-pdfbox2.pdf}} is the output using pdfbox 2.0.30. The annotation objects
> are reassigned to some available ID:
>
> {code:java}
> 38 0 obj
> << ... /Popup 39 0 R ... >>
> endobj
> 39 0 obj
> << ... /Parent 38 0 R ...>>
> endobj
> {code}
>
> The program outputs:
> {code:java}
> correct parent? true
> correct popup? true{code}
> h3. Actual Behavior
> {{out-pdfbox3.pdf}} is the output using pdfbox 3.0.0. The objects are
> assigned a new ID but their references are unchanged, so the /Popup and
> /Parent reference some other arbitrary object:
>
> {code:java}
> 3473 0 obj
> << ... /Popup 3 0 R ... >>
> endobj
> 3474 0 obj
> << ... /Parent 2 0 R ...>>
> endobj
> {code}
>
> The program crashes since the dereferenced /Parent is not an annotation:
> {code:java}
> Exception in thread "main" java.lang.ClassCastException: class
> org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationUnknown cannot
> be cast to class
> org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationMarkup
> (org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationUnknown and
> org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationMarkup are in
> unnamed module of loader 'app')
> at
> org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationPopup.getParent(PDAnnotationPopup.java:99)
> at
> PdfboxAnnotationRegressionTest.main(PdfboxAnnotationRegressionTest.java:45)
> {code}
>
>
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