So I'm wondering, what should the standard signature of this injection be? Always a field injection (as opposed to a constructor injection)? What about access (package or private)?

private @Logger Log log;

The reason I ask about access (and constructor injection) is because this could be the one pain in the side to unit testing a bean. Package access just makes it easier to inject a stub. What would be interesting is if the field could be seeded with a stub so that the logger just works in a unit test.

private @Logger Log log = new NoOpLogImpl();

The injection would overwrite this value. Just an idea.

-Dan