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https://issues.apache.org/jira/browse/PDFBOX-2996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15028366#comment-15028366
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Timo Boehme commented on PDFBOX-2996:
-------------------------------------
I had a look on the QuickSort.java attachment. First it is still a recursive
algorithm - and I thought an iterative version was proposed to overcome the
Stackoverflow exception? Second the implementation seems to be broken - I ran a
2-element test (in my head), say a list of \{2,1\}. 2 is pivot; {{i}} is
incremented, {{j}} not decremented -> {{i==j}} -> we have a (nonsense swap) and
{{i=2; j=0}}. Thus the list comes out unchanged.
It seems you should think about the algorithm in depth again and maybe if a
true iterative version is possible.
> StackOverflow in Quicksort
> --------------------------
>
> Key: PDFBOX-2996
> URL: https://issues.apache.org/jira/browse/PDFBOX-2996
> Project: PDFBox
> Issue Type: Bug
> Components: Text extraction
> Affects Versions: 1.8.10, 2.0.0
> Environment: Java 7
> Reporter: Manuel Aristaran
> Attachments: 001991.pdf, QuickSort.java,
> artikel1_20_arab.pdf-sorted-diff.txt, artikel1_20_arab.pdf-sorted-iter.txt,
> artikel1_20_arab.pdf-sorted-rekur.txt, failing_sort.pdf, quicksort.patch
>
>
> Running PDFTextStripper through ExtractText triggers a StackOverflow
> exception in the QuickSort implementation for [this particular
> document|https://www.dropbox.com/s/6crie7y5gqadwa5/1.pdf?dl=0].
> To reproduce: {{java -jar pdfbox-app-1.8.11-SNAPSHOT.jar ExtractText -sort
> failing_sort.pdf}}
> (Related to PDFBOX-1512)
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