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https://issues.apache.org/jira/browse/PDFBOX-3952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16192563#comment-16192563
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Johannes Porzelt commented on PDFBOX-3952:
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Ok, now I found the problem... We were preprocessing the documents if the files
size exceeded a configured max size. This "destroyed" them.
Thank you very much for your support!
> IllegalArgumentException: root cannot be null for Canon scanned PDFs
> --------------------------------------------------------------------
>
> Key: PDFBOX-3952
> URL: https://issues.apache.org/jira/browse/PDFBOX-3952
> Project: PDFBox
> Issue Type: Bug
> Components: Parsing
> Affects Versions: 2.0.7, 3.0.0
> Environment: java version "1.8.0_144"
> Reporter: Johannes Porzelt
> Attachments: 01b Die Wettbewerbskräfte neu betrachtet - 5 Forces
> 2.pdf, 02e Die 3 Regeln für den Erfolg - Spitzenleistungen-3.pdf
>
>
> We encounter the below exception while trying to process the attached
> documents.
> All issues that produced a similar or same exception seemed to fixed in our
> version (2.0.7).
> PDFs are scans of _Canon iR-ADV C5250_
> {code:java}
> java.lang.IllegalArgumentException: root cannot be null
> at org.apache.pdfbox.pdmodel.PDPageTree.<init>(PDPageTree.java:75)
> at
> org.apache.pdfbox.pdmodel.PDDocumentCatalog.getPages(PDDocumentCatalog.java:129)
> at
> org.apache.pdfbox.pdmodel.PDDocument.getNumberOfPages(PDDocument.java:1398)
> {code}
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