Consider the following file:

/** @see #foo
*/
public class t {
    /** foo */
    private void foo() { }
}

If I run javadoc -private, then javadoc is happy. If I run javadoc normally,
javadoc complains about not being able to find foo(). This makes it harder to
use javadoc for documenting the code to people who need the -private stuff. I
should only be warned if foo does not exist at all. If it does exist, but is
inaccesible at my current javadoc level (-private, -package, etc.) the @see
should just be silently ignored.