I’m writing an annotation processor using Kapt and...

# announcements

[Ian White]

I’m writing an annotation processor using Kapt and KotlinPoet; am I correct in thinking that there is no way to detect nullability on parameterized type values? i.e. I cannot distinguish myMap: Map<String,Any> from myMap: Map<String,Any?>, because both of those turn into Java Map<String,Object> from the standpoint of the annotation processor. Is there any way to distinguish them? As a workaround I’m considering adding an additional annotation @HasNullValue but it’s a bit of a hack.

[diesieben07]

You can read the kotlin.Metadata annotation and then use kotlinx.metadata.jvm to parse the metadata values and obtain precise kotlin types.
https://github.com/JetBrains/kotlin/tree/master/libraries/kotlinx-metadata/jvm

[Ian White]

Ah! That makes sense. Skimmed right over it. Thanks!