Jackson 自定义反序列化器委托恢复为默认值

Question

In a custom Jackson deserialiser, is there a way to delegate certain properties back to the default deserialiser?

@Override
public final T deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
    ObjectNode node = jp.getCodec().readTree(jp);

    T type = createType();
    //custom deserialise some fields here
    ...

    // Is there a way to delegate everything else back to Jackson?

    ObjectNode nodeToDelegate = node.get("someField");
    // delegate back to jackson and deserialise into `type`
    // nodeToDelegate can be anything - Number / Object / Array / etc.
}

ps I do need custom deserialiser and cannot use type annotations.

Answer 1

You can use following code to achieve this.

JsonParser parser = nodeToDelegate.traverse();
parser.setCodec(jp.getCodec());
parser.readValueAs(<Type>.class);