[chii]

> Of course you cannot change the JDBC connector after it was compiled!

no, but you can add, dynamically at run time (such as from a user supplied file) a new implementation of the interface. And because as part of the JDBC interface, a connector is able to register itself too (via classloading magic).

JDBC is just an example of a common plugin architecture for extensible software. But perhaps one way to make this work with AOT is to bring along the AOT compiler, and AOT the connector jar when it is being loaded, and treat that binary same as any dynamically linked library!