using jaxb to create deepcopies of objects, and build them from strings

DeepCopier.java

import javax.xml.bind.*;
import javax.xml.bind.util.JAXBSource;
import javax.xml.namespace.QName;
import javax.xml.transform.stream.StreamSource;

public class DeepCopier<T> {
    private static QName qname = new QName("deepcopy");
    private Unmarshaller unmarshaller;
    private JAXBElement<T> contentObject;
    private Marshaller marshaller;
    private Class<T> clazz;

    public DeepCopier(Class<T> clazz) {
        this.clazz = clazz;
        contentObject = new JAXBElement<T>(qname, clazz, null);

        try {
            JAXBContext jaxbContext = JAXBContext.newInstance(clazz);
            unmarshaller = jaxbContext.createUnmarshaller();
            marshaller = jaxbContext.createMarshaller();
        } catch(JAXBException e) {
            throw new RuntimeException(e);
        }
    }

    public T deepCopy(T object) {
        if(object==null) return null;

        contentObject.setValue(object);
        try {
            return unmarshaller.unmarshal(new JAXBSource(marshaller,contentObject),clazz).getValue();
        } catch (JAXBException e) {
            throw new RuntimeException(e);
        }
    }

/*
  new DeepCopier<XMLGregorianCalendar>(XMLGregorianCalendar.class).readXML(new StreamSource(new StringReader(new StringBuilder().append("<x>").append(time).append("2010-08-25T09:26:00").toString())));
*/

    public T readXML(StreamSource source) throws JAXBException {
        JAXBElement<T> root = unmarshaller.unmarshal(source, clazz);
        return root.getValue();
    }

}