[jira] [Created] (PDFBOX-3942) ClassCastException in getOptionalContentGroups

["Vlad-Tudor Marchis (JIRA)" <ji...@apache.org>]

Vlad-Tudor Marchis created PDFBOX-3942:
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             Summary: 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
            Priority: Minor
         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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