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https://issues.apache.org/jira/browse/PDFBOX-2261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14093946#comment-14093946
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Andreas Lehmkühler commented on PDFBOX-2261:
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The method PDFieldFactory#isButton walks down all kids to determine if one of
the kids has a button field type if the parent node hasn't any. Looks like
that's the reason for the massive recursive calls.
I can't find any reference in the spec that such a construct is possible/valid.
> Extremely long hang during getFields() on a few PDF files
> ---------------------------------------------------------
>
> Key: PDFBOX-2261
> URL: https://issues.apache.org/jira/browse/PDFBOX-2261
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 1.8.6
> Reporter: Tim Allison
> Priority: Minor
> Attachments: 966679.pdf, screenshot-pdfdebugger.png
>
>
> When I run oap.examples.fdf.PrintFields from trunk, the code seems to hang
> during acroForm.getFields(). This is a heavy load hang.
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