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https://issues.apache.org/jira/browse/PDFBOX-3012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14950009#comment-14950009
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Maruan Sahyoun commented on PDFBOX-3012:
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thanks for the report. I've resolved it somewhat differently by adding a
{{getWidgets()}} method to {{PDNonTerminalField}} and removed the cast in
{{flatten()}}. Could you retest and let us know if the issue has been resolved
by the changes made?
> PDAcroForm flatten() throws ClassCastException
> ----------------------------------------------
>
> Key: PDFBOX-3012
> URL: https://issues.apache.org/jira/browse/PDFBOX-3012
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 2.0.0
> Reporter: Jason Mackin
> Assignee: Maruan Sahyoun
> Labels: easyfix
> Fix For: 2.0.0
>
> Attachments: az101-1.15.0.pdf
>
>
> In the PDAcroForm class, in the flatten() method, there is a for loop that
> tries casting field to a PDTerminalField. But, the field is sometimes a
> PDNonTerminalField and the casting error is thrown.
> To fix this I just add one if statement right before the for loop that checks
> to see if field is an instance of PDTerminalField and place the for loop
> inside the if statement:
> if(field instanceof PDTerminalField){
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