Java Jackson使用生成器模式继承反序列化

我有一个基础班( Foo )有两个孩子( A B ).它们看起来像这样:

public abstract class Foo {
  private String fooString;
  public Foo(String fooString) {
    this.fooString = fooString;
  }
  //getter
}

@JsonDeserialize(builder = A.ABuilder.class)
public class A extends Foo {
  private int amount;
  public A(String fooString, int amount) {
    super(fooString);
    this.amount = amount;
  }
  //getter

  @JsonPOJOBuilder
  public static class ABuilder {
    private String fooString;
    private int amount;

    public ABuilder withFooString(final String fooString) {
        this.fooString = fooString;
        return this;
    }

    public ABuilder withAmount(final int amount) {
        this.amount = amount;
        return this;
    }

    public A build() {
      return new A(fooString, amount);
    }
  }
}

@JsonDeserialize(builder = B.BBuilder.class)
public class B extends Foo {
  private String type;
  public B(String fooString, String type) {
    super(fooString);
    this.type = type;
  }
  //getter

  @JsonPOJOBuilder
  public static class BBuilder {
    private String fooString;
    private String type;

    public BBuilder withFooString(final String fooString) {
        this.fooString = fooString;
        return this;
    }

    public BBuilder withType(final String type) {
        this.type = type;
        return this;
    }

    public B build() {
      return new B(fooString, type);
    }
  }
}

在我的控制器中,我有以下端点:

@PutMapping
private ResponseEntity<Foo> doSomething(@RequestBody Foo dto) {
    //stuff
}

但每当我尝试通过json有效负载发送时:

{
   "fooString":"test",
   "amount":1
}

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.test.Foo` (no Creators, like default construct, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information
 at [Source: (String)"{"fooString":"test","amount":1}; line: 1, column: 1]
    at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:67)
    at com.fasterxml.jackson.databind.DeserializationContext.reportBadDefinition(DeserializationContext.java:1451)
    at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1027)
    at com.fasterxml.jackson.databind.deser.AbstractDeserializer.deserialize(AbstractDeserializer.java:265)
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4013)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3004)
    at AbstractJackson.main(AbstractJackson.java:11)

如何让jackson将json反序列化到适当的子类中?我做错了什么?