Many huge companies are already invested in java. Big data tools are overwhelmingly written in java. However java the language sucks and scala has a veneer of c

Many huge companies are already invested in java. Big data tools are overwhelmingly written in java. However java the language sucks and scala has a veneer of coolness that makes bigco developers feel like they are being innovative. (See walmart's recent use of scala for an example). I'd focus on hiring the best data scientists you can, and let them retool if they feel the need.