Detach an entity from JPA/EJB3 persistence context

Question

What would be the easiest way to detach a specific JPA Entity Bean that was acquired through an EntityManager. Alternatively, could I have a query return detached objects in

Answer 1

If there aren't too many properties in the bean, you might just create a new instance and set all of its properties manually from the persisted bean.

This could be implemented as a copy constructor, for example:

public Thing(Thing oldBean) {
  this.setPropertyOne(oldBean.getPropertyOne());
  // and so on
}

Then:

Thing newBean = new Thing(oldBean);