从JPA/EJB3持久性上下文中分离实体

EntityManager em = ...;
MyEntity myEntity = ...;
em.detach(myEntity);

MyEntity myEntity = ...;
MyEntity detachedMyEntity = myEntity.clone();

MyEntity myEntity = ...;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(bos);
oos.writeObject(myEntity);
oos.flush();
byte[] byteData = bos.toByteArray();
bos.close();
oos.close();

ByteArrayInputStream bis = new ByteArrayInputStream(byteData);
ObjectInputStream ois = new ObjectInputStream(bis);
MyEntity detachedMyEntity = (MyEntity) ois.readObject();
ois.close();