XPath with namespace

[Max Bogdanov]

Hello!
I have no idea why this simple example does not work. Please give me same advice:
(if I remove namespace it works perfect)

private void doStuff(String xmlIn) {
        try {
            System.out.println("Input: " + xmlIn);
            DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
            Document doc = db.parse(new ByteArrayInputStream(xmlIn.getBytes()));
            XPath xPath = XPathFactory.newInstance().newXPath();
            xPath.setNamespaceContext(new NSResolver("s", "uri:osp:wsd"));
            Node node = (Node)xPath.evaluate("/s:request", doc, XPathConstants.NODE);
            if(node != null) {
                System.out.println("Result: OK");
            }else {
                System.out.println("Result: FAIL");
            }            
        } catch (Exception ex) {
            Logger.getLogger(MyXpathParser.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

Example output:
Input: <s:request xmlns:s="uri:osp:wsd">[1,2,3,4]</s:request> Result: FAIL


NamespaceContext implementation class:

public class NSResolver implements NamespaceContext {

    private Map<String, String> prefix2uri;
    private Map<String, String> uri2prefix;

    public NSResolver() {
        if (prefix2uri == null) {
            prefix2uri = Collections.synchronizedMap(new HashMap<String, String>());
        }
        if (uri2prefix == null) {
            uri2prefix = Collections.synchronizedMap(new HashMap<String, String>());
        }
    }

    public NSResolver(String prefix, String uri) {
        this();
        prefix2uri.put(prefix, uri);
        uri2prefix.put(uri, prefix);
    }

    public String getNamespaceURI(String prefix) {
        return prefix2uri.get(prefix);
    }

    public String getPrefix(String uri) {
        return uri2prefix.get(uri);
    }

    public Iterator getPrefixes(String uri) {
        return uri2prefix.keySet().iterator();
    }
}

Thanks, Max

[N Sahni]

Hi,

Everything looks good here except the namespace.
The namespace declared in xml is uri:osp:wsd whereas namaspace set in namaspacecontext is uri:osp.wsd Both does not match.

[Max Bogdanov]

N Sahni wrote:Hi,

Everything looks good here except the namespace.
The namespace declared in xml is uri:osp:wsd whereas namaspace set in namaspacecontext is uri:osp.wsd Both does not match.

It was my copy-paste mistake. I edited my post, the namespaces are same, I checked everything 1000 times))). Thanks.

[N Sahni]

Can you try modifying DocumentBuilderFactory instance like this:

DocumentBuilderFactory builder = DocumentBuilderFactory.newInstance();
builder.setNamespaceAware(true);
DocumentBuilder db = builder.newDocumentBuilder();

I tried executing your code and replicating the issue. By setting builder.setNamespaceAware(true); it worked properly.

[Max Bogdanov]

N Sahni wrote:Can you try modifying DocumentBuilderFactory instance like this:

DocumentBuilderFactory builder = DocumentBuilderFactory.newInstance();
builder.setNamespaceAware(true);
DocumentBuilder db = builder.newDocumentBuilder();

I tried executing your code and replicating the issue. By setting builder.setNamespaceAware(true); it worked properly.

Thank you so much! Now it works. I didn't know that default value is false.