Here's the situation:
I have an entity that refers to other entities, like this:
@Entity public class Invoice implements Serializable {
| @ManyToOne private transient Customer customer;
| }
It must implement Serializable so I can send it to message queues.
I labeled the customer field as transient, because I don't want it to serialize
and send the entire Customer object every time (that object has a bunch of its
own fields).
So, because that's transient, this Invoice entity shows up, is de-seriaiized,
and the customer field is null of course.
I then do
invoice = entityManager.merge(invoice);
to re-attach this now-detached entity. But when I do that, the customer field
gets set to null in the DB. It is taking the state from the un-serialized
object and writing over what's in the DB.
That's not what I want it to do, of course.
What's the right way to do this kind of thing? An easy work around I have is
to use entityManager.find(Invoice.class, invoice.getId()) but that seems wrong.
Ideas?
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