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https://issues.apache.org/jira/browse/PDFBOX-5714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17808054#comment-17808054
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Andreas Lehmkühler commented on PDFBOX-5714:
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We are facing two issues. We have to detect and replace any duplicate object
numbers when importing "foreign" objects and we have to adjust any indirect
object references pointing to those objects as well. I have some vague ideas
for the first one but the second one seems to be tricky
> 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
> Priority: Major
> Labels: regression
> 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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