title: How to find out efficiently the auto-generated id for a new object when using JPA?
body: <p>I have an attribute which is annotated with @Id. The ID is going to be generated automatically when persisting the object. That means that the ID-value is not defined before I persist the object. After persisting it, it has an ID (in the database), but unfortunately the field still remains null as long as I don't reload it from the DB.
  is there any easy way to find out the generated id? Or better: To configure that it will be written into the field?</p>
  
  <p>Thanks in advance</p>