Xpath Evaluation On XML where there are multiple Namespace Declaration and there's XMLNS Declaration Without Prefix

The XML contains multiple or more than one XMLNS namespace declaration. One of them is with declaration without prefix (http://www.ilog.com/rules/param) which causes issues where xpath can't read the Xml element.

<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ds="http://www.ilog.com/rules/DecisionService" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Body>
<DecisionServiceResponse >
<DecisionID>RLOS001PL62000205DRAFT_2019-07-05-13:35:57:48957</DecisionID>
<underwritingRequest xmlns="http://www.ilog.com/rules/param">
<ns0:underwritingApprovalRequest xmlns:ns0="http://www.tmbbank.com/enterprise/model">
<application xmlns="">
<projectCode/>

I have a Java class that implements javax.xml.namespace.NamespaceContext which later will be instantiated and set in the setNamespaceContext of the class javax.xml.xpath.XPath. Below showing how I override the 3 methods from the NamespaceContext interface. 

    /**
     * This method is called by XPath. It returns the default namespace, if the
     * prefix is null or "".
     *
     * @param prefix to search for
     * @return uri
     */
    public String getNamespaceURI(String prefix) {
        if (prefix == null || prefix.equals(XMLConstants.DEFAULT_NS_PREFIX)) {
            return prefix2Uri.get(DEFAULT_NS);
        } else {
            return prefix2Uri.get(prefix);
        }
    }
    //This method is not needed in this context, but can be implemented in a similar way.
    public String getPrefix(String namespaceURI) {
        return uri2Prefix.get(namespaceURI);
    }
    public Iterator<String> getPrefixes(String namespaceURI) {
        // Not implemented
        return null;
    } 

Apart from the above, there is another method as below: 

    private void putInCache(String prefix, String uri) {
            prefix2Uri.put(prefix, uri);
            uri2Prefix.put(uri, prefix);
    }

    private void storeAttribute(Attr attribute) {
        // examine the attributes in namespace xmlns
        if (attribute.getNamespaceURI() != null
                && attribute.getNamespaceURI().equals(XMLConstants.XMLNS_ATTRIBUTE_NS_URI)) {
            // Default namespace xmlns="uri goes here"
            if (attribute.getNodeName().equals(XMLConstants.XMLNS_ATTRIBUTE)) {
                putInCache(DEFAULT_NS, attribute.getNodeValue());
            } else {
                // Here are the defined prefixes stored
                putInCache(attribute.getLocalName(), attribute.getNodeValue());
            }
        }
    }

The above method would not work because are multiple xmlns declarations, and prefix2Uri is a HashMap which does not allow duplicates, hence the prefix DEFAULT will be set to the most latest xmlns="" declaration than the one highlighted in yellow as above. 

Let me print something below for your clarity: 

ns0, http://www.tmbbank.com/enterprise/model
DEFAULT, http://www.ilog.com/rules/param
DEFAULT, ""

As you can see, eventually the prefix2Uri HashMap contains only 2 entries: 

ns0, http://www.tmbbank.com/enterprise/model
DEFAULT, ""

In order to fix this, just need to add one line in the putInCache method that looks like below, highlighted in light blue: 

    private void putInCache(String prefix, String uri) {
        if (prefix2Uri.get(prefix) == null || prefix2Uri.get(prefix).equals("")) {
            prefix2Uri.put(prefix, uri);
            uri2Prefix.put(uri, prefix);
        }
    }

Besides that, the XPath query that is used to query the XML, also needs to add DEFAULT as the prefix. 

Initially, the method that builds the XPath is as below: 

    public static String getPath(Node n) {
        StringBuilder path = new StringBuilder();
        do {           
            path.insert(0, n.getNodeName());
            path.insert(0, "/");
        } while ((n = n.getParentNode()) != null && n.getNodeType() == Node.ELEMENT_NODE);
        return path.toString();
    }

Now, it should look like the below , added lines highlighted in purple:

    public static String getPath(Node n) {
        StringBuilder path = new StringBuilder();
        do {           
            if(n.getNamespaceURI() != null && !n.getNamespaceURI().equals("") && (n.getPrefix() == null || n.getPrefix().equals(""))){                path.insert(0, UniversalNamespaceCache.DEFAULT_NS + ":" + n.getNodeName());
            } else {
                path.insert(0, n.getNodeName());
            }
            path.insert(0, "/");
        } while ((n = n.getParentNode()) != null && n.getNodeType() == Node.ELEMENT_NODE);
        return path.toString();
    }