Java/Kotlin question about NonNull and primitive a...

# announcements

[alex]

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]

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]

seems to work with androidx.annotation.NonNull too

[arekolek]

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]

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

[kralli]

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]

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

[alex]

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