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https://issues.apache.org/jira/browse/PDFBOX-3942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16182738#comment-16182738
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Tilman Hausherr commented on PDFBOX-3942:
-----------------------------------------
To test your application, you can get a snapshot here:
https://repository.apache.org/content/groups/snapshots/org/apache/pdfbox/pdfbox-app/2.0.8-SNAPSHOT/
To see the current source, use svn or see here:
https://svn.apache.org/viewvc/pdfbox/trunk/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/graphics/optionalcontent/PDOptionalContentProperties.java?view=markup
> ClassCastException in getOptionalContentGroups
> ----------------------------------------------
>
> Key: PDFBOX-3942
> URL: https://issues.apache.org/jira/browse/PDFBOX-3942
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 2.0.6
> Reporter: Vlad-Tudor Marchis
> Assignee: Tilman Hausherr
> Priority: Minor
> Labels: support
> Fix For: 2.0.8, 3.0.0
>
> Attachments: PDOptionalContentProperties.java
>
>
> I noticed this issue when trying to remove a set of layers I previously added
> on a multi-page PDF. I noticed it in version 2.0.6, but might be present in
> others.
> Here is a stacktrace snippet:
> Caused by: java.lang.ClassCastException: org.apache.pdfbox.cos.COSDictionary
> cannot be cast to org.apache.pdfbox.cos.COSObject
> at
> org.apache.pdfbox.pdmodel.graphics.optionalcontent.PDOptionalContentProperties.getOptionalContentGroups(PDOptionalContentProperties.java:180).
> I looked at the source and saw the toDictionary method that seemed to be used
> in every other place so I just put in in place and it seems to have solved
> the issue.
> I've uploaded the updated file, the one that I'm using, which you can review
> and include in your project if it's a valid fix.
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