public @interface DefaultAnnotation
Indicates that all members of the class or package should be annotated with
the default value of the supplied annotation class.
This would be used for behavior annotations such as @NonNull, @CheckForNull,
In particular, you can use @DefaultAnnotation(NonNull.class) on a class or
package, and then use @Nullable only on those parameters, methods or fields
that you want to allow to be null.