How to extract SOAP message's body's content as a new XML document.

Main.java

package com.semvoz.jdk8.jdom;

import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.JDOMException;
import org.jdom2.Namespace;
import org.jdom2.filter.Filters;
import org.jdom2.input.SAXBuilder;
import org.jdom2.output.Format;
import org.jdom2.output.XMLOutputter;
import org.jdom2.xpath.XPathExpression;
import org.jdom2.xpath.XPathFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.StringReader;
import java.util.Arrays;
import java.util.List;

/**
 * Created by Clement Bramy on 3/05/15.
 * Created for project: jdk8-tutorial
 *
 * Soap message:
    <?xml version="1.0"?>
    <soap:Envelope xmlns:soap="http://www.w3.org/2001/12/soap-envelope" soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">
        <soap:Body xmlns:m="http://www.example.org/stock">
            <m:GetStockPriceResponse>
                <m:Price>34.5</m:Price>
            </m:GetStockPriceResponse>
        </soap:Body>
    </soap:Envelope>
 */
public class Main {
    private final static Logger logger = LoggerFactory.getLogger(Main.class);

    // Namespaces
    private final static List<Namespace> namespaces = Arrays.asList(
            Namespace.getNamespace("m", "http://www.example.org/stock"),
            Namespace.getNamespace("soap", "http://www.w3.org/2001/12/soap-envelope")
    );

    // Xpath
    private final static String SOAP_BODY_CONTENT_XPATH = "/soap:Envelope/soap:Body/m:GetStockPriceResponse";

    public static void main(final String [] args) throws JDOMException, IOException {
        final String stockXml = LocalSoapUtil.getSoapMessage("stock-price-response.xml");

        final SAXBuilder builder = new SAXBuilder();
        final Document document = builder.build(new StringReader(stockXml));

        final XPathFactory factory = XPathFactory.instance();
        final XPathExpression<Element> expression = factory.compile(SOAP_BODY_CONTENT_XPATH, Filters.element(), null, namespaces);
        final Element response = expression.evaluateFirst(document);

        logger.info("\n" + new XMLOutputter(Format.getPrettyFormat()).outputString(new Document(response.detach())));
    }
}