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https://issues.apache.org/jira/browse/PDFBOX-5044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17248388#comment-17248388
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Maruan Sahyoun commented on PDFBOX-5044:
----------------------------------------
Maybe go for a
[https://docs.oracle.com/javase/7/docs/api/java/util/IdentityHashMap.html] as
this does and identity check vs an equality check (which for COSDictionary is
currently the same)
> Stack overflow in PDFieldTree.enqueueKids()
> -------------------------------------------
>
> Key: PDFBOX-5044
> URL: https://issues.apache.org/jira/browse/PDFBOX-5044
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 2.0.22, 3.0.0 PDFBox
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Priority: Major
> Fix For: 2.0.22, 3.0.0 PDFBox
>
> Attachments: PDFBOX-4131-0.pdf
>
>
> {noformat}
>
> org.apache.pdfbox.pdmodel.interactive.form.PDFieldTree$FieldIterator.enqueueKids(PDFieldTree.java:102)
>
> org.apache.pdfbox.pdmodel.interactive.form.PDFieldTree$FieldIterator.enqueueKids(PDFieldTree.java:102)
>
> org.apache.pdfbox.pdmodel.interactive.form.PDFieldTree$FieldIterator.enqueueKids(PDFieldTree.java:102)
>
> org.apache.pdfbox.pdmodel.interactive.form.PDFieldTree$FieldIterator.enqueueKids(PDFieldTree.java:102)
>
> org.apache.pdfbox.pdmodel.interactive.form.PDFieldTree$FieldIterator.enqueueKids(PDFieldTree.java:102)
> {noformat}
> I'll use an extra set to detect this.
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