Hello Dmitry,
Can you send the code that performs the update? Can you provide the source for the Grade class as well? How are the PK's structured?
--Gordon
-----Original Message-----
From: Dmitry Mozheyko [mailto:mozheyko_d_at_mail.ru]
Sent: Friday, May 26, 2006 4:09 AM
To: persistence_at_glassfish.dev.java.net
Subject: Empty references object
I use glassfish b48.
I need two classes with unidirectional ManyToOne relation:
Pupil -> Grade
###### Pupil.java ########
...
@Entity
public class Pupil extends Person {
...
@ManyToOne(targetEntity=Grade.class)
private Grade grade;
...
}
When i change Pupil-instance grade attribute from 'A' to 'B' grade attribute in pupil instance, database updates successfully, but grade attribute of Pupil instance contents Grade-class instance with all NULL fields, and
em.createQuery("select o from Grade o where order by o.name").getResultList();
returns Collection with all Grade objects, but on the 'B-object-place' i see object with all fields = null.
i.e.
#########################
id name
"1" "A"
"" ""
"3" "C"
##########################
I tried to run on various platforms and glassfish versions, on JavaDB and PostgreSQL database, various CascadeType's - same result.
When i redeploy my application(or restart server;-)) all is ok.
When is my problem?