XML in string format to org.w3c.dom.Document in Java

Question

I am trying to convert a samlResponse in string format to org.w3c.dom.Document to validate it. But it yields null even though I have used couple of different ways.
One way is as below: Here even the inputStream is null.
BasicParserPool bpp = new BasicParserPool(); bpp.setNamespaceAware(true); Document doc= bpp.parse(new ByteArrayInputStream(samlResponse.getBytes())); Element responseElement = doc.getDocumentElement();

where the string samlResponse is as below (just a snippet):

String samlResponse = "<saml2p:Response xmlns:saml2p=\"urn:oasis:names:tc:SAML:2.0:protocol\"  xmlns:xs=\"http://www.w3.org/2001/XMLSchema\" Version=\"2.0\">   <saml2:Issuer etc etc

Any thoughts where I am going wrong?

also, don't convert xml strings to bytes in order to parse as you can break the character encoding. use a StringReader instead. — jtahlborn
– jtahlborn, Commented Sep 23, 2014 at 19:52

Raskolnikov · Accepted Answer · 2014-09-23 19:31:29Z

2

BasicParserPool is an OpenSAML class, and I haven't used OpenSAML, so I can't say why it isn't working.

I can give you a simple alternative that works for me however.

I convert Strings to org.w3c.dom.Document using javax.xml.parsers.DocumentBuilderFactory and javax.xml.parsers.DocumentBuilder:

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
Document result = dbf.newDocumentBuilder().parse(new ByteArrayInputStream(xml.getBytes()));

where "xml" is the String to convert. There is some exception-catching that I have left out.

The API is here: DocumentBuilder API

Hope this helps.

answered Sep 23, 2014 at 19:31

Raskolnikov

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Karthikeyan Subramanian · Accepted Answer · 2014-09-24 08:39:02Z

Hope this piece of below code helps

import java.io.IOException;
import java.io.StringReader;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

/**
 *
 * @author karthikeyan.s1
 */
public class Parser {

    public Document getDomElement(String xml) {
        Document doc = null;
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        dbf.setCoalescing(true);
        dbf.setNamespaceAware(true);
        try {

            DocumentBuilder db = dbf.newDocumentBuilder();
            InputSource is = new InputSource();
            is.setCharacterStream(new StringReader(xml));
            doc = db.parse(is);
        } catch (ParserConfigurationException e) {
            // Log.e("Error: ", e.getMessage());
            return null;
        } catch (SAXException e) {
            // Log.e("Error: ", e.getMessage());
            return null;
        } catch (IOException e) {
            //  Log.e("Error: ", e.getMessage());
            return null;
        }

        return doc;
    }
}

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