Ask HN: What programming language is Watson written in?

I am very curious about what programming language was used to write the Watson software that IBM used to play Jeopardy. There is a screen of code at 1:49 in this, http://www-943.ibm.com/innovation/us/watson/what-is-watson/a-system-designed-for-answers.html video, but I couldn't make out the language and it could just be a filler. Has anybody seen anywhere it was mentioned?