Details
Bug
Resolved
Major
Description
From Dominik Krupp:
here is an even simpler but runnable example.
All three paths have the same Xpath namespace scopes. I still think
there should be zero selected nodes with the "/root" path, but there is one.
My output with JDOM 1.0 and Jaxen 1.1beta10 in classpath:
Element root has namespace URI: http://mynamespace.org/
Size of node set (/root): 1
Size of node set (/my:root): 1
Size of node set (/foreign:root): 0
Program producing that output:
import java.util.List;
import org.jaxen.JaxenException;
import org.jaxen.XPath;
import org.jaxen.jdom.JDOMXPath;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.Namespace;
public class NullNamespaceXpath {
public static void main(String[] args) {
Namespace my = Namespace.getNamespace("my",
"http://mynamespace.org/");
Document doc = new Document();
Element root = new Element("root", my);
doc.setRootElement(root);
try {
XPath nullNamespacePath = new JDOMXPath("/root");
nullNamespacePath.addNamespace("my", "http://mynamespace.org/");
nullNamespacePath.addNamespace("foreign",
"http://foreignnamespace.org/");
XPath myNamespacePath = new JDOMXPath("/my:root");
myNamespacePath.addNamespace("my", "http://mynamespace.org/");
myNamespacePath.addNamespace("foreign",
"http://foreignnamespace.org/");
XPath foreignNamespacePath = new JDOMXPath("/foreign:root");
foreignNamespacePath.addNamespace("my",
"http://mynamespace.org/");
foreignNamespacePath.addNamespace("foreign",
"http://foreignnamespace.org/");
List selectedNodesNullNamespace = nullNamespacePath
.selectNodes(doc);
List selectedNodesMyNamespace =
myNamespacePath.selectNodes(doc);
List selectedNodesForeignNamespace = foreignNamespacePath
.selectNodes(doc);
System.out.println("Element root has namespace URI: "
+ root.getNamespaceURI());
System.out.println("Size of node set (/root): "
+ selectedNodesNullNamespace.size());
System.out.println("Size of node set (/my:root): "
+ selectedNodesMyNamespace.size());
System.out.println("Size of node set (/foreign:root): "
+ selectedNodesForeignNamespace.size());
} catch (JaxenException e) {
e.printStackTrace();
}
}
}
Activity
While that would fix this issue, it breaks 21 other unit tests. Still that gives me an idea where to look to fix this, and that's helpful.
P.S. Even if you aren't a committer you can still check out the code, and run the tests; then submit a patch if you figure out how to fix this. That's how people get to be committers. 
I'm not a jaxen committer but I think it could suffice to add the following lines in org.jaxen.jdom.DocumentNavigator#getChildAxisIterator(Object,String,String,String) to fix the problem, because it only occurs when the context node is a Document, not when it is an Element.
----------------------------------------------------
else if(el.getNamespace() != null) { return JaxenConstants.EMPTY_ITERATOR; }
----------------------------------------------------
Insert just before the following line
----------------------------------------------------
return new SingleObjectIterator(el);
----------------------------------------------------