A 1.0 version of JSR-275 has been released. The GeoAPI dependency should be upgraded.
Tried an upgrade to version 0.9.1 (the 1.0.0 version is actually a deployment mistake). A change in Unit.getConverterTo(Unit<?>) method signature seems to block the usage of JSR-275 API with unit that are unknown at compile-time. Sent an email to Jean-Marie and waiting for reply.
Upgrated to JSR-275 version 0.9.3 as of revision 1525.