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https://issues.apache.org/jira/browse/JXPATH-161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13744112#comment-13744112
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Michele Vivoda commented on JXPATH-161:
---------------------------------------
I think I fixed this (at least for simple paths) changing method
doStepPredicatesStandard in SimplePathInterpreter at line 408
I changed
int index = indexFromPredicate(context, predicate);
if (it.setPosition(index + 1)) {
pointer = it.getNodePointer();
}
To
int index = indexFromPredicate(context, predicate);
if (index>=0 && it.setPosition(index + 1)) {
pointer = it.getNodePointer();
}
To support this check there are also the other calls to indexFromPredicate,
some do the check that here was missing.
> negative index in xpath expression
> ----------------------------------
>
> Key: JXPATH-161
> URL: https://issues.apache.org/jira/browse/JXPATH-161
> Project: Commons JXPath
> Issue Type: Bug
> Affects Versions: 1.3, 1.4
> Reporter: Michele Vivoda
> Priority: Minor
> Attachments: TestNegativeIndex.java
>
>
> JXPath seems to handle incorrectly negative indexes in XPath expressions
> Given xml <root><a>1<a></root> and xpath "/root/a[-1]"
> Xalan and Saxon match no node
> JXPath matches <a>.
> The same happens also for expressions "/root/a[-2]" and "/root/a[0]" (in
> XPath index starts with one)
> This problem does not affect xpath on beans, that seems to work correctly,
> but is present when performing xpath on DOM.
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