Deserializing an abstract class in Gson

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I’d suggest adding a custom JsonDeserializer for Nodes:

Gson gson = new GsonBuilder()
    .registerTypeAdapter(Node.class, new NodeDeserializer())
    .create();

You will be able to access the JsonElement representing the node in the deserializer’s method, convert that to a JsonObject, and retrieve the field that specifies the type. You can then create an instance of the correct type of Node based on that.

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