You are getting a connection from WebSpheres connection Pool. This wraps the underlying jdbc objects with it's own.
You will need to do some investigation and determine if the WebSphere ResultSet object has any access methods to get the wrapped resultset (Oracles) and get that. Second try configuring a different Provider for the DataSource (Oracles) check your server documentation for this.
Finally you may need to do a direct connection instead of getting it out of the pool to do this.