So Jackson deserializer seems to handle this correctly, whereas Fauna Java driver deserialization does not. I want to create a data class for this response and assign the missing keys. The network response is a WebSocket Payload from Kraken and looks like a JSON array, that has elements without keys. If we compare to the Jackson deserialize/serialize library that is used to deserialize the request body from the frontend to my backend service, this is not a problem. For my Android app I try to parse a network response using Kotlinx serialization. In contrary to PolymorphicSerializer, all known subclasses with.
Could this be it? In Kotlin, when a field is non-nullable, the field needs to be set upon object creation (providing the value to the constructor normally). This class provides support for multiplatform polymorphic serialization of sealed classes. The problem seems to lie in that the deserialization process first instantiates the data class with no values (because this is OK in Java) and then sets the values on every field afterwards. It is a string value and it is correctly returned from Fauna and received in my application.
The value of the field in Fauna is not null. One of my Kotlin data classes has a field that does not allow null values - a feature of Kotlin language (see here: Null safety | Kotlin) - and thus causes an exception to be thrown when data from Fauna is fetched and deserialization process and creation of instance of Kotlin data class is attempted. I’m writing a backend service in Kotlin and Spring Boot, and for Fauna integration I’m using the Java driver ( GitHub - fauna/faunadb-jvm: Scala and Java driver for FaunaDB).
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