My compiler warns me about `A default nullness annotation has not been specified for the package`. I'm using Juno with Java 7.

The documentation stats you should add `@NonNullByDefault` as a package option, but I don't know what that means.

Can I somehow set `NonNullByDefault` for the whole package? In Eclipse I can't right click on a package and say `add option` or something similar.

Or do I just add `@NonNullByDefault` to any class in a package and then it's valid for all beans in that package? Or do I have to create some meta info file in the pakage to add package options? I must be blind because I can't find any help online....

A small example would be great.