java jackson 自定義_java – 如何在自定義反序列化器中使用jackson ObjectMapper？

我嘗試編寫自定義jackson反序列化器.我希望“檢視”一個字段并對類執行自動反序列化,請參閱下面的示例：

import com.fasterxml.jackson.core.JsonParser;

import com.fasterxml.jackson.core.JsonProcessingException;

import com.fasterxml.jackson.core.ObjectCodec;

import com.fasterxml.jackson.databind.DeserializationContext;

import com.fasterxml.jackson.databind.JsonDeserializer;

import com.fasterxml.jackson.databind.JsonNode;

import com.mypackage.MyInterface;

import com.mypackage.MyFailure;

import com.mypackage.MySuccess;

import java.io.IOException;

public class MyDeserializer extends JsonDeserializer {

@Override

public MyInterface deserialize(JsonParser jp, DeserializationContext ctxt)

throws IOException, JsonProcessingException {

ObjectCodec codec = jp.getCodec();

JsonNode node = codec.readTree(jp);

if (node.has("custom_field")) {

return codec.treeToValue(node, MyFailure.class);

} else {

return codec.treeToValue(node, MySuccess.class);

}

}

}

的POJO：

public class MyFailure implements MyInterface {}

public class MySuccess implements MyInterface {}

@JsonDeserialize(using = MyDeserializer.class)

public interface MyInterface {}

我得到了StackOverflowError.了解codec.treeToValue調用相同的反序列化器.有沒有辦法在custom deseralizer中使用codec.treeToValue或ObjectMapper.readValue(String,Class< T>)？