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https://issues.apache.org/jira/browse/PDFBOX-2261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14096185#comment-14096185
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Maruan Sahyoun commented on PDFBOX-2261:
----------------------------------------

[~jahewson] I like that suggestion. 

One question. If I understand the current model correctly PDField doesn’t 
represent an actual field but it’s subclasses so instead of
{code}
class PDField extends PDFieldTreeNode
{code}
it will be
{code}
abstract class PDField extends PDFieldTreeNode
{code}

> 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
>            Assignee: Andreas Lehmkühler
>            Priority: Minor
>             Fix For: 2.0.0
>
>         Attachments: 966679.pdf, RadioButtons.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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