First, please verify that the JDBC driver you were using before is either the same one you've uploaded and deployed into your new environment (MII Menu -> System Resources -> JDBC drivers) or is the right one for the version of Oracle DB you have.
For the Data Server please share the screenshot of your configuration if it's IDBC type (MII Menu -> Data Services -> Data Servers; select your connection) and if it's a Data Source type please share the resource configuration screen where you have the connection setup.
Finally, what are the errors that you are seeing when it does fail?
Sam