java - XPath is returning null for xml with defaultNamespace

Question

I believe it was working sometime ago but now xpath is returning null. Can somebody help me find my stupid mistake in following code?
Or I will have to provide NamespaceContext even after setNamespaceAware(false)?

DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
domFactory.setNamespaceAware(false);
domFactory.setIgnoringComments(true);
domFactory.setIgnoringElementContentWhitespace(true);

try {
 Document doc = domFactory.newDocumentBuilder().parse(new File("E:/Temp/test.xml"));
 XPath xp = XPathFactory.newInstance().newXPath();
 NodeList nl = (NodeList) xp.evaluate("//class", doc, XPathConstants.NODESET);
 System.out.println(nl.getLength());
}catch (Exception e){
 e.printStackTrace();
}

XML document is here:

<?xml version="1.0" encoding="UTF-8"?>
<root xmlns="http://www.example.com/schema">
 <class />
 <class />
</root>

Answer 1

Three options are apparent. In order of easiest first from my point of view:

• change your XPath from "//class" to "//*[local-name() = 'class']". It's a little kludgy but it will ignore namespaces. If this still gives you zero, you know the problem is not namespaces.
• register a namespace prefix for "http://www.example.com/schema" in your Java code, and use it in your XPath expression: "//foo:class"
• figure out what parser implementation you're using and why it's behaving differently from @Rodney's, or change to a different one