We currently don’t have up-to-date snappy/jpy support for Mac but we hope to be able to address this in May 2017.
The snappy setup script fails and opens a dialog asking for legacy Java SE 6 runtime to be installed
I have seen this on a Mac before in some other context. I guess goes back to time when JRE 6 where preinstalled on a Mac. This is misleading.
For time being, I suggest you try building jpy on your own. See its README on GitHub. Then copy the precompiled jpy module into your .snap/snappy folder (or some other place, where snappy is installed).
Regards
Norman