How to use Jackson JsonSubTypes annotation in Kotlin

Question

I'm trying to convert some Java code that uses Jackson's @JsonSubTypes annotation to manage polymorphism.

Here is the working Java code:

@JsonTypeInfo(     use = JsonTypeInfo.Id.NAME,     include = JsonTypeInfo.As.PROPERTY,     property = "type") @JsonSubTypes({     @JsonSubTypes.Type(value = Comment.class, name = "CommentNote"),     @JsonSubTypes.Type(value = Photo.class, name = "PhotoNote"),     @JsonSubTypes.Type(value = Document.class, name = "DocumentNote") }) public abstract class Note implements Identifiable {     [...] 

Here is the Kotlin code I think would be equivalent:

JsonTypeInfo(     use = JsonTypeInfo.Id.NAME,     include = JsonTypeInfo.As.PROPERTY,     property = "type") JsonSubTypes(     JsonSubTypes.Type(value = javaClass<Comment>(), name = "CommentNote"),     JsonSubTypes.Type(value = javaClass<Photo>(), name = "PhotoNote"),     JsonSubTypes.Type(value = javaClass<Document>(), name = "DocumentNote") ) abstract class Note : Identifiable {     [...] 

But I get the following errors on each of the three "JsonSubTypes.Type" lines :

Kotlin: An annotation parameter must be a compile-time constant Kotlin: Annotation class cannot be instantiated 

Any idea?

Answer 1

I believe this has been resolved and nowadays you can write it like this:

import com.fasterxml.jackson.annotation.JsonSubTypes import com.fasterxml.jackson.annotation.JsonTypeInfo  @JsonTypeInfo(    use = JsonTypeInfo.Id.NAME,    include = JsonTypeInfo.As.PROPERTY,    property = "type")    @JsonSubTypes(        JsonSubTypes.Type(value = Comment::class, name = "CommentNote"),        JsonSubTypes.Type(value = Photo::class, name = "PhotoNote"),        JsonSubTypes.Type(value = Document::class, name = "DocumentNote")) interface Note 

Note the missing @ and class notation in the JsonSubTypes.Type.