Jackson:beandserializerModifier基于接口/抽象类的反序列化

我需要反序列化JSON,但能够控制对象实例化。因为我需要窥视JSON对象内容来构造对象,所以我使用了一个 JsonDeserializer ,的 ValueInstantiator TreeNode ,所以我有个习惯 .

AbstractDeserializer 无法反序列化到对象中。我正在反序列化一个接口/抽象类类型,它有getter和setter,类似于

interface MyInterface {
  String getName();
  void setName(String name);
}

我不知道怎样才能达到我所需要的。这是我使用的代码的草图

SimpleModule module = new SimpleModule();
objectMapper.registerModule(module);
module.setDeserializerModifier(new BeanDeserializerModifier() {
    @Override
    public JsonDeserializer<?> modifyDeserializer(DeserializationConfig config, BeanDescription beanDesc, JsonDeserializer<?> deserializer) {
        if (special.contains(beanDesc.getBeanClass())) {
            return new MyDeserializer(deserializer);
        }
        return deserializer;
    }
});


public class MyDeserializer extends JsonDeserializer {
    @Override
    public Object deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
        ObjectCodec codec = jsonParser.getCodec();
        JsonNode treeNode = codec.readTree(jsonParser);
        JsonNode jsonNode = treeNode.get("someAttribute");
        Object reference = //...
        jsonParser = codec.treeAsTokens(treeNode);
        jsonParser.nextToken();
        return defaultDeserializer.deserialize(jsonParser, deserializationContext, reference);
    }
}

我得到了例外

java.lang.UnsupportedOperationException: Can not update object of type com.example.MyObject (by deserializer of type com.fasterxml.jackson.databind.deser.AbstractDeserializer)
    at com.fasterxml.jackson.databind.JsonDeserializer.deserialize(JsonDeserializer.java:126) ~[jackson-databind-2.8.8.jar:2.8.8]
    at com.example.MyDeserializer.deserialize(MyDeserializer.java) ~[classes/:na]