Have a look at my post if you missed it. Working Java Example DepthStream and PointStream
I put that bit of code together using the same approach as you.
I’ve moved to OpenNI so I can run on a Raspberry pi, there is a halfway decent java example in Open NI that enumerates avaliable configurations from the device. I’ve adapted that example quite easily to generate a point cloud. I also posted that to the forum.