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https://issues.apache.org/jira/browse/PDFBOX-2996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15028465#comment-15028465
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Lars Torunski commented on PDFBOX-2996:
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No, you choose the wrong pivot.
list is {2,1}
low=0, high=1
i=0, j=1
because (low+high)/2 = (0+1)/2 = 1/2 = 0, the pivot is 2
while i <= j is true, 0 <= 1
2<=2 && 0<1 -> true -> i++ -> i=1
2<=1 && 1>0 -> false -> nop
1<=1 -> true -> swap -> list is {1,2}, i++, j-- -> i=2, j=0
end of while
low=0 < j=0 -> false
i=2 < high=1 -> false
list is {1,2}
> 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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