Hi Tim,
Since the database is providing the value, you will need to do an explicit
action to pull the values from the table. Try doing the em.refresh(entity)
after the commit call. The em.persist() invocation does not push anything
to the database until a flush() or commit() is performed. So, there would
be nothing to refresh from the database until the flush/commit is
performed. That should work for you.
Another idea is to do an em.find(), but since you have the entity handy, you
should be able to get by with the refresh() call.
HTH,
Kevin
On Tue, Oct 11, 2011 at 8:05 PM, Tim Watts <t...@cliftonfarm.org> wrote:
> Hello,
>
> I'm sure this problem comes down to me not fully groking the JPA way:
> Using OpenJPA (2.0.1), how do I get a call to persist() to automatically
> populate non-nullable, non-key fields whose values are generated by the
> database? Here are the particulars:
>
> DDL:
> modified timestamp not null default current_timestamp,
>
> Entity:
> @Temporal (TemporalType.TIMESTAMP)
> @Column (insertable=false, updatable=false)
> private Calendar modified;
>
> Relevant JPA Property:
> openjpa.AutoDetach=close,commit,nontx-read
>
> Databases:
> PostgreSQL 8.4, Derby 10.8
>
> Test (which fails):
> ...{set fields, but not 'modified'}...
> et = em.getTransaction();
> et.begin();
> em.persist(entity);
> et.commit();
> assertNotNull(entity.getModified());
>
> A query on the table, of course, shows a value for modified.
>
> Some things I've tried that haven't worked:
> * Immediately after persist, entity.getModified();
> * Immediately after persist, em.refresh(entity);
>
> On a possibly related note, I'm puzzled as to why I'm seeing the
> following message when I run my tests despite the fact that I'm running
> the enhancer on my domain classes via the openjpa-maven-plugin
> (codehaus):
>
> INFO [main] openjpa.Enhance - You have enabled runtime
> enhancement, but have not specified the set of persistent
> classes. ...
>
> I've inspected the .class file and it has a pcGetmodified among other
> things. So it looks like the classes are indeed getting enhanced.
>
> Any insights? Do I need a post processor to populate 'modified'?
>
>
>
