Annotation Interface Nullable

A common Spring annotation to declare that annotated elements can be 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 @Nullable annotations unless they behave differently.

Can be used in association with @NonNullApi or @NonNullFields to override the default non-nullable semantic to nullable.

Sebastien Deleuze, Juergen Hoeller
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