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. 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. Data class is a simple class which is used to hold data/state and contains standard functionality. this is thrown from val tmp Json. Example: destructuring declarations and maps.

You could also use the standard class Pair and have function() return Pair, but its often better to have your data named properly.

Mark the base class as sealed or register the serializer explicitly. rialization reduces the size of the JSON that results when serializing objects by omitting the default values of object properties. Since data classes automatically declare componentN() functions, destructuring declarations work here. 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. Data serialization in Kotlin refers to converting data from one format to another. : Class Foo is not registered for polymorphic serialization in the scope of Bar.

Data class serializable kotlin