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From David Goodenough <>
Subject Re: Audit log with OpenJPA
Date Thu, 07 Jul 2011 14:35:45 GMT
On Thursday 07 Jul 2011, Bengt Rodehav wrote:
> I'm using OpenJPA for persistence and would like to audit log any changes
> made to my entities. I serialize the objects to JSON (with Gson) and store
> them in a separate table in the database. Since the audit log needs to have
> the correct id's, the audit logging must take place after the entity has
> been persisted.
> I was hoping I could use the @PostPersist and @PostUpdate life cycle
> callbacks for this. I do seem to have the right information available and
> the serialization works fine but I don't know how I can persist my audit
> log entries at this point. From what I've read, I'm not allowed to use the
> entity manager in a "Post" lifecycle callback which of course makes this
> hard.
> What do you recommend? Is there a good place in JPA/OpenJPA where I
> automatically can trigger the storing of an audit log entry as described
> above. Of course I can move this logic up from the persistence layer to a
> place where I can first have the entity manager persist my entity and then
> explicitly call another service to do the audit log. However, this is a
> pretty general mechanism that I would like to have automatic support for in
> my framework which is why I would like to have it pushed down into the
> persistence layer.
> Any ideas?
> /Bengt
You could of course cheat.

While you can not access the entiry manager, there is nothing to stop you
using JDBC.  It would probably not be a good idea to access a table that
JPA is using, but if this audit trail is write only for this app and only
read elsewhere that would solve the problem.


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