Call .save() in PostPersist method

[Stephane Piette]

Hi,
I'm trying to automatically create a new object each time another
object is created. I decided to use @PostPersist annotation, here is
my code :

public class AdviceSheet extends GenericModel {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
public int id;
public String title;
public String city;

@PostPersist
public void postPersist() {
System.out.println(this.description);
new City(this.city).save();
}
}

public class City extends GenericModel {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
public int id;
public String name;

public City(String name){
this.name = name;
}
}



But with this code, if I try to create an AdviceSheet, I got an
exception :
play.exceptions.JavaExecutionException: null id in models.AdviceSheet
entry (don't flush the Session after an exception occurs)
at play.mvc.ActionInvoker.invoke(ActionInvoker.java:228)
at Invocation.HTTP Request(Play!)
....


What's the problem ?
Is there any workaround ?
Thanks

[Manuel Bernhardt]

see http://docs.jboss.org/hibernate/entitymanager/3.5/reference/en/html/listeners.html:
"A callback method must not invoke EntityManager or Query methods!" -
i.e., @PostPersist was apparently not designed for the purpose of
calling persistance operations.

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[Manuel Bernhardt]

About a workaround: I resorted to overriding the save() and create()
methods of the entity in which I want to do something after
persistance and performing additional operations in there.

[Stephane Piette]

Ok the answer is clear !
Thanks, I'll do like you

On 12 juil, 15:36, Manuel Bernhardt <bernhardt.man...@gmail.com>
wrote:

> About a workaround: I resorted to overriding the save() and create()
> methods of the entity in which I want to do something after
> persistance and performing additional operations in there.
>
> On Tue, Jul 12, 2011 at 3:34 PM, Manuel Bernhardt
>
>
>
>
>
>
>

> <bernhardt.man...@gmail.com> wrote:
> > seehttp://docs.jboss.org/hibernate/entitymanager/3.5/reference/en/html/l...