builder.parse((new StringReader(xml)) returns DeferredDocumentImpl

Question

I am trying to understand what mistake I could have made but can't find the solution.

public static Document getXMLFromString(String xml) {
        org.w3c.dom.Document doc = null;
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory
                    .newInstance();
            factory.setNamespaceAware(true);
            DocumentBuilder builder;
            builder = factory.newDocumentBuilder();
            doc = (org.w3c.dom.Document) builder.parse(new InputSource(
                    new StringReader(xml)));
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        }
        return doc;
    }

I did import org.w3c.dom.Document

I am calling this method here:

private Node getAuthToken(SOAPMessage responseAuth) throws SOAPException,
            TransformerException, ParserConfigurationException, IOException,
            SAXException {
        String s = indentXML(responseAuth.getSOAPPart().getContent());
        Document doc = getXMLFromString(s);
        NodeList authTokenNodeList = doc.getElementsByTagName("authToken");
        return authTokenNodeList.item(0);
    }

The NodeList is empty.

After researching on the web, everybody uses this code to parse a string to a Document. I do not have any exception but after calling the method parse(), the value of doc is set to [#document: null] DeferredDocumentImpl.

I am using everything from the org.w3c.dom.

xml is a string that contains

<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Header>
<context xmlns="urn:zimbra">
<session id="36" type="admin">36</session>
<change token="251"/>
</context>
</soap:Header>
<soap:Body>
<AuthResponse xmlns="urn:zimbraAdmin">
<authToken>...</authToken>
<lifetime>...</lifetime>
<a n="zimbraIsDomainAdminAccount">false</a>
<session id="36" type="admin">36</session>
</AuthResponse>
</soap:Body>
</soap:Envelope>

Here is how I built the string after a SOAP call:

String xml = indentXML(responseAuth.getSOAPPart().getContent());

What am I doing wrong?

This is what I am trying to do in a simple way:

StringBuilder soapResponse = new StringBuilder(...
...
...
);

        org.w3c.dom.Document doc = null;
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory
                    .newInstance();
            factory.setNamespaceAware(true);
            DocumentBuilder builder;
            builder = factory.newDocumentBuilder();
            doc = (org.w3c.dom.Document) builder.parse(new InputSource(
                    new StringReader(soapResponse.toString())));
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        }
        NodeList authTokenNodeList = doc.getElementsByTagName("authToken");
        Node n = authTokenNodeList.item(0);
        String s = n.getNodeValue();

What is in the contents of the File, and what is the varialbe xml ? — RMT
– RMT, Commented Jun 17, 2011 at 14:55
Could you also show us the complete code of your import like Jon Skeet said in his answer — RMT
– RMT, Commented Jun 17, 2011 at 15:00
Just edited my message, thank you for your help guys, I really don't understand what's wrong. — user393381
– user393381, Commented Jun 17, 2011 at 15:09
if the XML is from a file, have you tried reading it from the file using the parse method?? — RMT
– RMT, Commented Jun 17, 2011 at 15:11
The XML is the one I received after making a SOAP call. String xml = indentXML(responseAuth.getSOAPPart().getContent()); — user393381
– user393381, Commented Jun 17, 2011 at 15:14

Jon Skeet · Accepted Answer · 2011-06-17 15:42:15Z

EDIT: Looking at your updated code, I think this is the problem:

String s = n.getNodeValue();

If you look at the docs for Node you'll see that getNodeValue() is defined to return null for elements... hence the problem. My sample code uses getTextContent() instead, which works fine.

It looks like that's just going to defer expanding in-memory objects until they're required.

Have you tried calling methods on the returned document rather than just looking in the debugger? I suspect everything is actually working as intended. If not, please post a short but complete program which shows it misbehaving. (Note that in the sample you've given, you haven't even shown how builder is set, and you haven't used factory.)

EDIT: The code you've given works for me. Here's a quick-and-dirty - but importantly, complete - program (using Guava to load the XML file into a string) which shows the node being found successfully:

import org.w3c.dom.*;
import org.xml.sax.*;
import java.text.*;
import java.util.*;
import javax.xml.parsers.*;
import java.io.*;
import com.google.common.base.*;
import com.google.common.io.*;

public class Test {

    public static void main(String[] args) throws Exception {
        String xml = Files.toString(new File("test.xml"), Charsets.UTF_8);
        Node node = getAuthToken(xml);
        System.out.println(node.getTextContent());
    }

    private static Node getAuthToken(String xml) throws Exception {
        Document doc = getXMLFromString(xml);
        NodeList authTokenNodeList = doc.getElementsByTagName("authToken");
        return authTokenNodeList.item(0);
    }

    public static Document getXMLFromString(String xml) throws Exception {
        Document doc = null;
        DocumentBuilderFactory factory = DocumentBuilderFactory
            .newInstance();
        factory.setNamespaceAware(true);
        DocumentBuilder builder;
        builder = factory.newDocumentBuilder();
        doc = builder.parse(new InputSource(new StringReader(xml)));
        return doc;
    }
}

Yes I did try to call the getElementsByTagName() method, with a tag element that I know exists.
@user393381: No, please post a short but complete program - something I can compile and run, which will show the problem.
@user393381: I've now updated my answer with a short but complete program of my own. You may want to try that...
I just posted a code thqt doesn't work for me. I still don't understand. I will try your code.
@Jon Skeet: You were right about everything. As you suspected, it was working properly already, and I was using the getNodeValue() instead of getTextContent(). The text content is what I want, I am trying to get the difference between the two.

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