The last black stain was removed. JVx didn't fully support connection pools. It was because of our internal statement cache mechanism and load-on-demand.
We had inofficial support for connection pooling but it wasn't a solution without problems (we weren't proud of it).

With next JVx release or next nightly build, you will be able to use connection pools with same caching mechanism and with full backwards compatibility. We still support load-on-demand for storage records and binary data e.g. BLOBs.

We've some documentation for you:

Connection pooling

and for another new JVx (server-side) feature:

Server-side Call events

Thanks for your patience