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https://issues.apache.org/jira/browse/PDFBOX-5400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17514121#comment-17514121
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Oliver Schmidtmer commented on PDFBOX-5400:
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Found the difference between trunk and 2.0.
In both branches, if a referenced object is missing in the xref table, the
object should be read from a brute force object list.
In 2.0 this is not done, because here
[https://github.com/apache/pdfbox/blob/2.0/pdfbox/src/main/java/org/apache/pdfbox/pdfparser/COSParser.java#L668]
bfSearchCOSObjectKeyOffsets is null as the brute force search has not jet been
done.
> Page tree root must be a dictionary
> -----------------------------------
>
> Key: PDFBOX-5400
> URL: https://issues.apache.org/jira/browse/PDFBOX-5400
> Project: PDFBox
> Issue Type: Bug
> Components: Parsing
> Affects Versions: 2.0.26
> Reporter: Tilman Hausherr
> Priority: Major
> Labels: regression
> Attachments: 4ECBGZDM5GUZG7UT75RV5GTUFWF5TSXK.pdf
>
>
> worked in 2.0.25
> {noformat}
> Caused by: java.io.IOException: Page tree root must be a dictionary
> org.apache.pdfbox.pdfparser.PDFParser.initialParse(PDFParser.java:198)
> org.apache.pdfbox.pdfparser.PDFParser.parse(PDFParser.java:226)
> org.apache.pdfbox.pdmodel.PDDocument.load(PDDocument.java:1107)
> {noformat}
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