使用GSON将JSON反序列化为Java会导致字段为空

public class MyObject {
    @SerializedName("json_field")
    private String javaField;
    // ...
}

public class MyObject {
    private String javaField = "";
    // ...
}

public class MyObjectDeserializer implements JsonDeserializer<MyObject> {
    @Override
    public MyObject deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
        JsonObject jsonObject = json.getAsJsonObject();
        String fieldValue = jsonObject.get("json_field").getAsString();
        
        // 处理字段为空的情况
        if (fieldValue == null) {
            fieldValue = "";
        }
        
        MyObject myObject = new MyObject();
        myObject.setJavaField(fieldValue);
        
        return myObject;
    }
}

Gson gson = new GsonBuilder()
        .registerTypeAdapter(MyObject.class, new MyObjectDeserializer())
        .create();
MyObject myObject = gson.fromJson(jsonString, MyObject.class);