# UnknownNull

Artifact: [androidx.media3:media3-common](https://developer.android.com/jetpack/androidx/releases/media3) [View Source](https://cs.android.com/search?q=file:androidx/media3/common/util/UnknownNull.java+class:androidx.media3.common.util.UnknownNull)

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```
@Nonnull(when = When.UNKNOWN)
@TypeQualifierDefault(value = ElementType.TYPE_USE)
@Retention(value = RetentionPolicy.CLASS)
@UnstableApi
public annotation UnknownNull
```

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Annotation for specifying unknown nullness. Useful for clearing the effects of an automatically propagated `https://docs.oracle.com/javase/8/docs/api/javax/annotation/Nonnull.html` annotation.