Hi,

I need to create a changelog of my database. Every time an instance of some entity changes, I need to persist the changes it in my changelog database.

The problem is that I need to know WHAT changed, and persist the old value and the new value to the changelog.

First, I've tried to use the Lifecycle callbacks, and at onUpdate, load the actual entity persisted state and compare it with memory state. Of course it doesn't work, probably because the persisted and in-memory entities instances have the same id.

Second, I tried to use the Interceptor. The onFlushDirty method receives an array of previousState properties. But this arrays always came null !!!

Anyone have already faced with this problem ?

Thanks in advance,

Joao

Look at the AuditInfo pattern on the wiki....(it uses the interceptor - and it works ;)

Ok, but the audit info (I'm almost sure) just uses time (like time created, time update anb so on) information.

It doesn't need to read already persisted data like I need. That's my problem. I couldn't compare persisted data with in memory data.

...hmm...the method overwritten in the AuditInfo allows yourself to "rememeber" the state of specific instances! Just put them in your own map and keep the bookkeeping ya'self ...should not be that hard ?