Java Kotlin question about NonNull and primitive arrays ``` kotlinlang #announcements

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alex

07/16/2019, 11:57 AM

Java/Kotlin question about NonNull and primitive arrays:

@Value
public final class Url {
  @NonNull
  private URL url;
  @NonNull 
  private byte[] signature;
}

but in Kotlin it's always treated like

ByteArray!

. Apart from that, NonNull is marked with warning: primitive type members cannot be annotated. Any idea what could be wrong? NonNull annotations are from checker framework.

kralli

07/16/2019, 12:09 PM

It works for me using the

org.jetbrains.annotations.NotNull

annotation. Maybe you should try the these ones instead https://mvnrepository.com/artifact/org.jetbrains/annotations/17.0.0

arekolek

07/16/2019, 12:15 PM

seems to work with

androidx.annotation.NonNull

too

I tried it with this though:

public interface Url {

    @NonNull
    URL getUrl();

    void setUrl(@NonNull URL url);

    @NonNull
    byte[] getSignature();

    void setSignature(@NonNull byte[] signature);

}

assuming it’s what

@Value

would do

kralli

07/16/2019, 12:18 PM

Given that there is an issue about a similar case, I don’t think that they’re fully respected yet: https://youtrack.jetbrains.com/issue/KT-11456

But I can confirm that it does exactly the same when as you described (both Kotlin and IDE) when using the checker framework, so its most likely very buggy

alex

07/16/2019, 1:12 PM

I suppose I can fill an issue then, checker framework annotations are considered to be replacement for findbugs javax.annotation, so

https://youtrack.jetbrains.com/issue/KT-32695

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