Generate objects from JSON with Polymorphism

I have this JSON and I want to generate objects with it.

{
  "responseId": "response-id",
  "session": "projects/project-id/agent/sessions/session-id",
  "queryResult": {
    "queryText": "End-user expression",
    "parameters": {
      "orderNumber": "PQL7648194AAAAA",
      "lastName": "RIVERO"
    },
    "action": "order",
    "allRequiredParamsPresent": true,
    "intent": {
      "name": "projects/project-id/agent/intents/intent-id",
      "displayName": "[InfoVuelo] Dia-hora de salida - datos de orden"
    },
    "languageCode": "es"
  },
  "originalDetectIntentRequest": {}
}

The fields of "parameters" are variable. For example for one situation parameters could be

{
  "parameters": {
     "email":"example@example.com"
  }
}

Also, I could have

{
"parameters": {
		"orderNumber": "PQL7648194AAAAA",
		"lastName": "RIVERO"
    }
}

I made a class Parameters and 2 classes(OrderNumberAndLastNameParams and EmailParams) that extends Parameters

public class EmailParams implements Parameters {
    private String email;
}  

public class OrderNumberLastNameParams implements Parameters {
    private String orderNumber;

    private String lastName;
}

My method to create objects with a given JSON file

public static <T> T buildBodyFromJson(String filePath, Class<T> clazz) {
    ObjectMapper myMapper = new ObjectMapper();
    T jsonMapper = null;
    try {
      jsonMapper = myMapper.readValue(new ClassPathResource(filePath).getInputStream(), clazz);
    } catch (IOException e) {
      fail(e.getLocalizedMessage());
    }
    return jsonMapper;
  }

But when I try to build the object, It tries to instantiate Parameter object instead of children objects getting "Unrecognized field ... not marked as ignorable ".

I'm understanding that you don't really need two separated classes, the problem is that you need to generate a requestbody with this object that doesn't have null / empty fields.
Well, there is an annotation that may help you.

Create a single class for paramters with all the 3 properties and annotate with @JsonInclude(JsonInclude.Include.NON_EMPTY)

@JsonInclude(JsonInclude.Include.NON_EMPTY)
public class Parameters  {
    private String email;
    private String orderNumber;
    private String lastName;
}  

This annotation makes empty or null fields to not appears on the requestbody that you're creating.