XPath: doesn't work for SOAP message?

Question

My method
     * Get value of the node specified by an XPath.
     * @param item The starting context (e.g. document, node, node list).
     * @param xPath XPath to select single node value (e.g. "/root/data/value[1]/text()")
     * @return Result of <i>xPath</i> (the node's value) or null if failed.
     * @throws XPathExpressionException if <i>xPath</i> is wrong.
    static public String getXPathValue(Object item, String xPath) throws XPathExpressionException {
        String result = null;
        if (item != null && xPath != null) {
            try {
                result = XPathFactory.newInstance().newXPath().evaluate(xPath, item);
            } catch (NullPointerException npe) {
                //XPathFactory.newInstance() throws NullPointerException when called from ActiveX bean
                if (item instanceof Document) {
                    result = getXPathValueApache((Document) item, xPath);
        }//else: input values not available
        return result;
    }//getXPathValue()works good enough for plain XML files (no namespaces). Now I have a SOAP XML message and my XPath doesn't work with this code - but it works with other XPath tools or my old Apache method:
     * Get value of the node specified by an XPath.
     * @param document Document to get node value of.
     * @param xPath XPath to select single node value (e.g. "/root/data/value[1]/text()")
     * @return Result of <i>xPath</i> (the node's value) or null if failed.
     * @throws org.w3c.dom.xpath.XPathException if XPath result object is not of type XPathResult.
     * @see <a href="http://www.w3schools.com/xpath/default.asp">XPath Tutorial</a>
    static private String getXPathValueApache(Document document, String xPath) throws org.w3c.dom.xpath.XPathException {
        String result = null;
        if (document != null && xPath != null) {        
            org.w3c.dom.xpath.XPathEvaluator evaluator = new org.apache.xpath.domapi.XPathEvaluatorImpl(document);
            Object o = evaluator.evaluate(xPath, document, evaluator.createNSResolver(document), org.w3c.dom.xpath.XPathResult.FIRST_ORDERED_NODE_TYPE, null);
            if (o != null) {
                if (o instanceof org.w3c.dom.xpath.XPathResult) {
                    org.w3c.dom.xpath.XPathResult xpResult = (org.w3c.dom.xpath.XPathResult) o;
                    Node node = xpResult.getSingleNodeValue();
                    if (node != null) {
                        result = node.getNodeValue();   
                } else {
                    throw new org.w3c.dom.xpath.XPathException(org.w3c.dom.xpath.XPathException.TYPE_ERR, "XPath '"+xPath+"' didn't return an object of type  XPathResult!");
            }//else: no result for XPath
        }//else: input values not available
        return result;
    }//getXPathValue()The XPath is quite simple and I also had it in 2 ways: short and long:
//rsp:SessionId[1]/text()
/SOAP:Envelope/SOAP:Header/rsp:Response/rsp:SessionId/text()
Why doesn't this work with the standard
XPathFactory.newInstance().newXPath().evaluate(xPath, item)
?

Answer 1

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