www.JavaBluetooth.org
Thanks to Mike for the pointer.
From the site:
The JavaBluetooth Stack is a 100% (no native) Java implementation of the Bluetooth Specifications Version 1.1. It currently supports HCI, L2CAP and SDP. Support for RFCOMM, TCS, and SCO, as well as implementations of specific Bluetooth Profiles such as the Handsfree-Profile and the Generic Audio/Video Distribution Profiles are planned.