JAXB Adapter from DOM nodes / elements

MyXmlAdapter.java

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import javax.xml.bind.annotation.adapters.XmlAdapter;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;


// XmlAdapter<Object,*> receives XML DOM nodes in org.w3c.dom.Element.
public class MyXmlAdapter extends XmlAdapter<Object, TargetClass> {
    private DocumentBuilder documentBuilder;

    public MyXmlAdapter() {
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            documentBuilder = factory.newDocumentBuilder();
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public TargetClass unmarshal(Object nodes) {
        Element element = (Element)nodes;
        TargetClass target = new TargetClass(...);
        // target....
        return target;
    }

    @Override
    public Object marshal(TargetClass v) {
        Document document = documentBuilder.newDocument();
        Element root = document.createElement("element");
        // element....
        return root;
    }
}

XmlAdapter<org.w3c.dom.Element, *> does work well.