@Documented
@Retention(value=SOURCE)
@Target(value={PACKAGE,TYPE})
public @interface NonNullByDefault
Nullable
annotations on fields, parameters or
methods that should not use the default.
NOTE: Eclipse does not yet handle defaults well (in particular, if you add this on a class which implements Comparable, then it will insist that your compare method is changing the nullness of the compare parameter, so you'll need to add @Nullable on it, which also is not right (since the method should have implied @NonNull and you do not need to check the parameter.). For now, it's best to individually annotate methods, parameters and fields.
This is a marker annotation and it has no specific attributes.