To deserialize a JSON string to an ArrayList using Gson in Kotlin, you can use a TypeToken. The specific use-case where I ran in to problems was with a sealed class, but the same issue could be encountered with any Kotlin object. This tutorial will teach us how to serialize Kotlin data classes containing default values into a JSON format. However, when attempting to deserialize a JSON array into an ArrayList of a specific object type, some additional steps may need to be taken in order to properly handle the data. For every class annotated with Serializable, the compiler generates a serializer on its companion object.

( val a: Box Box(42), val b: Box Box(Project('rialization', 'Kotlin')) ) Serializable data class Project(val.

not be easy to serialize a view, but you can copy all the necessary data to. Trying to serialize generic data class having with default value produces empty JSON object Easiest way to reproduce this issue is to try official generic classes example add data modifier to the clas. A serializer is a class that handles an object’s serialization and deserialization. For instance, you can access an internal class or a top-level declaration. Let’s begin with a quick recap of what an object is, and the expected behaviour.Ī Kotlin object is essentially a Singleton which can extend another class and provide custom behaviours to that class. The Kotlin Serialization library generates serializers for classes annotated with Serializable.

Objects are a useful part of the Kotlin language and there is actually a real gotcha when it comes to using them with the Java Serializer.

Kotlin serializable data class