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https://issues.apache.org/jira/browse/JXPATH-89?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12510087
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Sergey Vladimirov commented on JXPATH-89:
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Let me try to implement my idea and discuss this later :)
> Cannot compare pointers that do not belong to the same tree
> -----------------------------------------------------------
>
> Key: JXPATH-89
> URL: https://issues.apache.org/jira/browse/JXPATH-89
> Project: Commons JXPath
> Issue Type: Bug
> Affects Versions: Nightly Builds, 1.2 Final
> Environment: codebase: 1.2 or latest version from SVN, JDK 1.4
> Reporter: Sergey Vladimirov
> Fix For: 1.3
>
> Attachments: VariablePointerTestCase.java
>
>
> For XPath "$var | /MAIN/A" exception is thrown:
> org.apache.commons.jxpath.JXPathException: Cannot compare pointers that do
> not belong to the same tree: '$var' and ''
> at
> org.apache.commons.jxpath.ri.model.NodePointer.compareNodePointers(NodePointer.java:665)
> at
> org.apache.commons.jxpath.ri.model.NodePointer.compareNodePointers(NodePointer.java:649)
> at
> org.apache.commons.jxpath.ri.model.NodePointer.compareNodePointers(NodePointer.java:649)
> at
> org.apache.commons.jxpath.ri.model.NodePointer.compareTo(NodePointer.java:639)
> at java.util.Arrays.mergeSort(Arrays.java:1152)
> at java.util.Arrays.sort(Arrays.java:1079)
> at java.util.Collections.sort(Collections.java:113)
> at
> org.apache.commons.jxpath.ri.EvalContext.constructIterator(EvalContext.java:176)
> at
> org.apache.commons.jxpath.ri.EvalContext.hasNext(EvalContext.java:100)
> at
> org.apache.commons.jxpath.JXPathContext.selectNodes(JXPathContext.java:648)
> at
> org.apache.commons.jxpath.ri.model.VariablePointerTestCase.testUnionOfVariableAndNode(VariablePointerTestCase.java:76)
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