I have a question about merge and persist. I understand the basic difference
between the two, but I am trying to undertand a bit more of the behavior of
merge.
I modified the User.java class in the seam-registration example and added an Id
field.
| @Id @GeneratedValue(strategy=GenerationType.AUTO)
| public Long getId() {
| return id;
| }
|
The problem I ran into is the "detached entity passed to persist" as I was
trying to register multiple users. I guess persist expects the id field not to
be set. At least that is what I gathered from other posts.
I switched to merge, and it works. I don't understand why it should work
though. Since User is a session scoped entity bean, doesn't it mean it should
remain alive during the whole session. in which case shouldn't the merge just
update the same user instead of creating a new one. I inspected the database,
and it does indeed create multiple users.
Can someone point to the hole in my understanding.
-hc
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