Como convertir un objeto XML Document a un String

import org.dom4j.Document;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;
import java.io.ByteArrayOutputStream;


   public String Document2String(Document doc) {

        String xml = "";

        try {
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            OutputFormat format = OutputFormat.createPrettyPrint();
            XMLWriter writer = new XMLWriter(out, format);
            writer.write(doc);
            writer.close();
            xml = out.toString();
            out.close();

        } catch (Exception e) {
        }
        return xml;
    }