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Hi

Hibernate version: 3.05

i've just started to use the event listener classes in hibernate3 and am a little confused as to their intended use.

what i am trying to achieve is to trigger an additional update to the one being performed by the system. basically - if record type x is being updated, update record y also. i have tried using preinsert, preupdate and onflushentity events but the second update is not happening. i have added debug statements that show me that the listeners are being triggered after a commit is called and before the commit returns.

some sample code:


i have tried session.flush() both here and in the underlying tx mechanism that handles the tx control and closes the session at the end. no change.
when session.flush() is called i can see that the listeners are triggered again and so forth but the second object's record is not being updated.

do i have it all wrong - is there no intention to use the event listeners for further entity changes to be persisted?

any suggestions would be appreciated.

Takis

That prevents code from working.
As a rule of thumb: do not use == on objects.

For your code I suggest using
If( o instanceOf MyObject ){

}

Reason: at runtime H enhances persistent classes and therefore actual type of o is the subclass of MyObject class

Or use if ( “MyObjectClassName”.equals(event.getEntityClassName()) )

http://www.hibernate.org/hib_docs/v3/re ... vents.html

Hi

thanks for responding.

the reason i use it that way in this case is that there is in fact a number of entity types i'm checking against - its eaiser to loop through an array of class objects than a series of if instanceof else if etc.... object comparison in this case is not i believe an issue - indeed i've never had a problem.

someone may want to correct me if wrong here but according to the java spec there exists only one class object instance (as in MyObject.class or myObject.getClass()) of any particular object within a jvm so comparison of myObject.getClass and the MyObject.class will work regardless of how many MyObjects objects you have and wish to make a comparison or otherwise against.

in any case. this is not quite the issue i am having here. the use of the event framework doesn't seem to easily support what i'm trying to achieve in my original post (???).

any further suggestions would be appreciated.
thanks.

Takis

Very very outdated and hence wrong assumption. There might be any number of class objects for the same class within a JVM.
There likely to be one class definition per classloader hierarchy, but might be one class definition per classloader, even multiple class definition per classloader.