Akula

Underside leaf color and even the color of the fruit are not perfect tells to differentiate between Blue Java and Pisang Awak (Tall Namwa). I always thought the blue fruit were the obvious tell but I visited a fellow member a week ago and his Blue Java fruit did not look like Crazy Banana's avatar despite the plant being from CB. More like a super dark green than a blue to me. Maybe it was the light. Local growing conditions have a pretty big influence on this plant's demonstratable characteristics and taste it seems to me. In my opinion individual banana attachment to the peduncle seems to me to be the best way to differentiate between Blue Java and Pisang Awak/Namwah.

I think the OP's plant is a Namwah.