like the summary says, the current directory "." should be part of the classpath environment variable set by java-config, this makes things a lot more convinient when working with java.
It does, if you use --set-user-classpath. I does not if you use --set-system-classpath, as that would break too many ebuilds _and_ be a security hazard. I will add this to to the Java Guide.
Notification added to the Java Guide. Will appear on gentoo.org on the next refresh cycle.