XPath is not working with namespaces

I want to query an XML using XPath.

I couldn't query properly when there is name space in XML.
<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/">
   <env:Body>
      <ns2:fld1 xmlns:ns3="http://esb.tiaa.org" xmlns:ns2="http://esb.tiaa.org/participant-portfolio-v1/types">
         <ns2:fld2>
            <ns2:fld3>446623.5298</ns2:fld3>
         </ns2:fld2>
      </ns2:fld1>
   </env:Body>
</env:Envelope>

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Below is the java code to query
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		factory.setNamespaceAware(true);
		DocumentBuilder builder = factory.newDocumentBuilder();
		Document doc = null;
// "xmlStr" contain above XML
		doc = builder.parse(new InputSource(new StringReader(xmlStr)));
		XPathFactory xpathFactory = XPathFactory.newInstance();
		XPath xpath = xpathFactory.newXPath();

		List<String> list = new ArrayList<String>();
		StringBuffer strRowData = null;
		strRepeatableElement = "/env:Envelope/env:Body/ns2:fld1/ns2:fld2";
		XPathExpression expr = xpath.compile("count(" + strRepeatableElement + ")");
System.out.println((Double) expr.evaluate(doc, XPathConstants.NUMBER)); // Printing 0

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Search result is count is printed as 0 in last line. What could be the problem?
LVL 6
Ravi KallaTechnology LeadAsked:
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Gertone (Geert Bormans)Information ArchitectCommented:
you will need a namespace manager, but first try this to see the only issue is the namespace

strRepeatableElement = "//*[local-name() = 'fld2']";
Gertone (Geert Bormans)Information ArchitectCommented:
after you initialised xpath
add
xpath.addNamespace(Namespace.getNamespace("ns2", "http://esb.tiaa.org/participant-portfolio-v1/types");

for each namespace prefix you want to use in the XPath
Ravi KallaTechnology LeadAuthor Commented:
@Geert Bormans : I couldn't find "Namespace" class.

I found a solution and it is working fine now:
		Map<String, String> prefMap = new HashMap<String, String>();
		prefMap.put("env", "http://schemas.xmlsoap.org/soap/envelope/");
		SimpleNamespaceContext namespaces = new SimpleNamespaceContext(prefMap);
		xpath.setNamespaceContext(namespaces);

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Gertone (Geert Bormans)Information ArchitectCommented:
it always help if you specify which parser classes you are using :-)
mccarlIT Business Systems Analyst / Software DeveloperCommented:
it always help if you specify which parser classes you are using :-)
Well, to be fair Geert, it is reasonably obvious from the code posted that the javax.xml classes were being used!
Gertone (Geert Bormans)Information ArchitectCommented:
my bad, to me it was not ...
apologies then
Ravi KallaTechnology LeadAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for Ravi Kalla's comment #a40422732

for the following reason:

This is working for me
Gertone (Geert Bormans)Information ArchitectCommented:
I like to point out that this is a working solution
ID: 40422536
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