I am trying to compare old object values with new values using prevState parameters in hibernate interceptor function

public boolean onFlushDirty(Object entity, Serializable id, Object[] currState, Object[] prevState, String[] propertyNames, Type[] types) throws CallbackException


I have experienced that prevState parameter is always null.

Since it is null I retrieved the old state from database, however for the properties that are of collection type, the old state is already updated.

Any pointers on

1) why this prevState would be null
2) why would the collection property in database would already be in new state.

Hi ,

I have the same problem. Did you ever find an answer to this?

I do not know when previousState is null, but I think it is on an Insert operation. Because for my HistoryInterceptor where I'm just interested in changes compared to a previous version, I only evaluate


As this works for me, I do not have the experience that prevState !

I have found the prevState to be always null, whether its update/delete or insert.

Okay, I forgot to say: I'm working with detached objects, and so, when I do the updates on the server, I call EntityManager.merge() on the object the client sent to me. On this call, Hibernate reloads the previous state from the database and does it's comparisions on dirty attributes/objects.

So, in this context, I always have previous state values.

Carlolf ..that makes sense. Probably that is the reason why prevState is null in my case, I am not doing a merge


Thank you all!