javax.persistence.Entitymanager: remove() method

Question

Does remove(Object entity) method of EntityManager work only on those objects got from find() method?

I have following code snippet:

Answer 1

With JPA, you can remove an entity without retrieving it by simply executing a delete statement:

javax.persistence.Query query = entityManager.createQuery("delete from A where id = :id");
query.setParameter("id", "value of id to delete");
int deletedRows = query.executeUpdate();