You really should consult Hibernate's documentation and especially understand the persistent object
lifecycle (Java Persistence with Hibernate is an excellent book). Saving an object will persist it
to the database (probably including generating an ID and updating the object). Saving it again will
try to save an object with the same ID to the database - thus the error. What you want is something
like Hibernate's update() or saveOrUpdate() or JPA's merge().
Uli
On 08.02.2010 11:39 schrieb Dominik Gätjens:
for sure, but if i persist an object in the http session, i've got the same
object again after page reload? So i should be able to save it in the hibernate
session because it is the same Object?
e.g.
first page load -> get ObjectA from DB -> save ObjectA in http-Session
second page load -> get ObjectA from http-Session -> save ObjectA in DB
but this throws an "a different object with the same identifier value was already
associated with the session:" Exception.
So according to Jose i don't get the right Object (that is bound to the
hibernate-session) from the http-session!?
-----Ursprüngliche Nachricht-----
Von: Ulrich Stärk [mailto:u...@spielviel.de]
Gesendet: Montag, 8. Februar 2010 11:31
An: Tapestry users
Betreff: Re: AW: Updating Hibernate Entites
@Persist is for persisting objects in the Http session, not for persisting
entities in a database.
Uli
On 08.02.2010 10:28 schrieb Dominik Gätjens:
I'm using the chenillekit hibernate daos, and there is no explicit update
method, so i thought save() should do this job.
I don't understand why there is a new Object if I annotade the config with
@Persist. Shouldn't it be saved in the Session?
btw: i found a possible solution with page activation context:
void onActivate(Long configId){
config=configDAO.doRetrieve(configId,false);
}
Long onPassivate(){
return config.getId();
}
but I still want to know why it won't work with @Persist?
-----Ursprüngliche Nachricht-----
Von: Jose Luis Sanchez [mailto:joseluis.sanc...@m-centric.com]
Gesendet: Montag, 8. Februar 2010 10:21
An: Tapestry users
Betreff: Re: Updating Hibernate Entites
You are trying to save a new object while using the old object id ,
what would end in two entities with same id - something not possible.
You should call your DAO update method , instead of save.
Hello List,
i'm trying to update an Hibernate-Object but alway get an "a different object with
the same identifier value was already associated with the session:" Exception.
My Form-Code looks like:
@Inject
private ConfigurationDAO configDAO;
@Persist
@Property
private Configuration config;
void onSuccessFromConfigForm(){
config.setEditDate(new Date());
configDAO.doSave(config);
}
void onActivate(Long configId){
config=configDAO.doRetrieve(configId,false);
}
void onActivate(){
configs = configDAO.findAll();
if(config==null)
config=new de.leomedia.leotipp.model.Configuration();
}
can anyone give me a lead into the right direction?
thanks, Dominik
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