Configuration in Java EE application for connection to MDM backend system

Hi,

We're developing a support application to using the MDM java libraries that is transported using NWDI.

The application will have to connect to different MDM backend systems in dev, QA and production.

Where is the best place the parameters for which backend system to connect to (servername, port, username, password) ?

web.xml of the application ?

portal systems?

create admin configuration page in the application and store in java system's database?

We need to be sure that the connection properties are not overwritten when a new version of the application is transported using NWDI.

Regards

Dagfinn