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https://issues.apache.org/jira/browse/JXPATH-89?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12510059
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Sergey Vladimirov commented on JXPATH-89:
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For example, Variables interface should allow to return not the object itself,
but node pointer, so value will be part of original tree.
Then at "sorting stage" variable is unpacked and original node pointer (if such
exists) is used.
> 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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