@Documented
@Retention(value=CLASS)
@Target(value={METHOD,PARAMETER,FIELD,LOCAL_VARIABLE,ANNOTATION_TYPE,PACKAGE})
public @interface Nullable
When decorating a method call parameter, this denotes that the parameter can legitimately be null and the method will gracefully deal with it. Typically used on optional parameters.
When decorating a method, this denotes the method might legitimately return null.
This is a marker annotation and it has no specific attributes.