io.micronaut.core.annotation

Annotation Type Nullable

@Target(value={METHOD,PARAMETER,FIELD,ANNOTATION_TYPE})
 @Retention(value=RUNTIME)
 @Documented
 @Nonnull(when=MAYBE)
 @TypeQualifierNickname
public @interface Nullable

A common 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 Micronaut API.

Should be used at parameter, return value, and field level. Methods override should repeat parent @Nullable annotations unless they behave differently.

Since:

2.4

Author:

graemerocher

See Also:

NonNull