We are configuring 9iAS with RAC and I recently learned that J2EE .ear files do not use tnsnames to contact and create sessions in the database. Rather a config file called data_source.xml is used instead.
My problem is my understanding that tnsnames.ora is used to configure load balancing (and failover) to the two database nodes. But tnsnames.ora is not used with .ear files.
Does anyone have any experience/insight to this?