@Target(value={METHOD,PARAMETER,FIELD}) @Retention(value=RUNTIME) @Documented @Nonnull(when=MAYBE) @TypeQualifierNickname public @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 @Nullable
annotations unless they behave differently.
Can be used in association with NonNullApi
or @NonNullFields
to
override the default non-nullable semantic to nullable.
NonNullApi
,
NonNullFields
,
NonNull