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https://issues.apache.org/jira/browse/PDFBOX-5176?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17345052#comment-17345052
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Andreas Lehmkühler commented on PDFBOX-5176:
--------------------------------------------

Generally speaking the idea is to be as lenient as possible when parsing a pdf 
and to read as much as possible. Once the pdf is loaded (2.0) / the initial 
parsing is done (3.0) some issues might come up with problematic/missing 
values. This can increase the chances to process at least parts of a 
problematic pdf, e.g. even if all images are broken text extraction should be 
possible.

> java.io.IOException: Page tree root must be a dictionary
> --------------------------------------------------------
>
>                 Key: PDFBOX-5176
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-5176
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Parsing
>    Affects Versions: 3.0.0 PDFBox
>            Reporter: Tilman Hausherr
>            Priority: Major
>         Attachments: GHOSTSCRIPT-695040-0.zip-71.pdf, 
> GHOSTSCRIPT-695040-0.zip-87.pdf
>
>
> Happens only on 3.0, not on 2.0.23



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