I'm using Weblogic 6.1 and have a bunch of CMP entity beans. I want
to have this app clustered, such that any cluster instance can create
a new entity bean instance with the primary key generated
automatically. Ideally I'd like Weblogic to use a database-generated
primary key.

Using Weblogic 6.1, is this even possible? If so, how?

The db I am using is Postgresql, which is very similar to Oracle. So
I'd love to hear about any solution that works for either Postresql or
Oracle.