Jackson序列化不包含异常字段的类型信息

public abstract class Shape {
    protected String type;
    
    // getters and setters
}

public class Circle extends Shape {
    private double radius;
    
    // getters and setters
}

public class Rectangle extends Shape {
    private double width;
    private double height;
    
    // getters and setters
}

public class Drawing {
    @JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, include = JsonTypeInfo.As.PROPERTY, property = "@class")
    private List<Shape> shapes;
    
    // getters and setters
}

public class Main {
    public static void main(String[] args) throws JsonProcessingException {
        Circle circle = new Circle();
        circle.setType("circle");
        circle.setRadius(5.0);

        Rectangle rectangle = new Rectangle();
        rectangle.setType("rectangle");
        rectangle.setWidth(10.0);
        rectangle.setHeight(8.0);

        Drawing drawing = new Drawing();
        drawing.setShapes(Arrays.asList(circle, rectangle));

        ObjectMapper mapper = new ObjectMapper();
        String json = mapper.writeValueAsString(drawing);
        
        System.out.println(json);
    }
}

{
  "shapes": [
    {
      "@class": "com.example.Circle",
      "type": "circle",
      "radius": 5.0
    },
    {
      "@class": "com.example.Rectangle",
      "type": "rectangle",
      "width": 10.0,
      "height": 8.0
    }
  ]
}