[jira] [Updated] (PDFBOX-1512) TextPositionComparator is not compatible with Java 7

["John Hewson (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PDFBOX-1512?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

John Hewson updated PDFBOX-1512:
--------------------------------
    Fix Version/s: 2.0.0

> TextPositionComparator is not compatible with Java 7
> ----------------------------------------------------
>
>                 Key: PDFBOX-1512
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-1512
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Text extraction
>    Affects Versions: 1.7.1, 2.0.0
>         Environment: Java 7
>            Reporter: Benjamin Papez
>            Assignee: Andreas Lehmkühler
>             Fix For: 2.0.0
>
>         Attachments: FOP-2252.pdf, TextPositionComparator.java, Topo.pdf, Topo.txt, TopoContained.pdf, TopoContained.txt, TopoOverlap.pdf, TopoOverlap.txt, WFI_PDFParser_TextPostionComparator.txt, illustration-of-inconsistent-sorting.png, immo-kurier_arsenal_93x62.pdf, quicksort.patch
>
>
> The TextPostionCompartor causes the following exception running on Java 7: Unexpected RuntimeException from org.apache.tika.parser.ParserDecorator$1@9007fa2 Original cause: Comparison method violates its general contract!
> I think the problem is with this check:
> if ( yDifference < .1 ||
>     (pos2YBottom >= pos1YTop && pos2YBottom <= pos1YBottom) ||
>     (pos1YBottom >= pos2YTop && pos1YBottom <= pos2YBottom))
> as it violates the contract requirement:
> The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0.
> Finally, the implementor must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z.
> Java 7 now is strict and throws exceptions when the contract is violated.



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