Annotation Interface Nullable
null under some circumstance. Leverages JSR 305 meta-annotations to
indicate nullability in Java to common tools with JSR 305 support and used by Kotlin to infer nullability of Spring API.
Should be used at parameter, return value, and field level. Methods override should repeat parent
unless they behave differently.
Can be used in association with
NonNullApi to override the default non-nullable semantic to nullable.