I've been asked to add the ESS package for our HCM system, release ERP 605 latest stack (Abap only).
In older releases to use the ESS I remember was required a J2EE instance were to deploy the ESS packages.
Somewhere over the network I read that starting from EHP5 the webdympro architecture is changed and the J2EE instance could not be required anymore.
BUt it's not clear for me if it's mandatory to setup a separate Abap instance or I could use the Abap instance of the HCM system itself.
Any advise on this issue ? Which is better ?