Issue generating nested interface object

[patpatpat123]

Hello team,

I wanted to reach out highlighting an issue generating a nested interface object please.

Please allow me to show a simple concrete example.

I have a class Farm which contains one (it is an example) Animal (interface).

The concrete Animal would be a Cow, Sheep, whatever.

public class Farm {

    private String name;
    private int capacity;
    private Animal animal;

//getters and setters

public interface Animal {

}

public class Cow implements Animal {

    private String name;
    private int age;

//getters and setters

public class Sheep implements Animal {

    private String name;
    private String color;

//getters and setters

I am using this code in order to generate the schema:

public class GenerateSchemaTest {

    public static void main(String[] args) throws JsonProcessingException {
        ObjectMapper mapper = new ObjectMapper();
        JsonSchemaGenerator schemaGen = new JsonSchemaGenerator(mapper);
        JsonSchema schema = schemaGen.generateSchema(Farm.class);
        String schemaString = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(schema);
        System.out.println(schemaString);
    }

}

And I was hoping to get something like this: (Expected result)

{
  "type" : "object",
  "id" : "urn:jsonschema:com:schema:Farm",
  "properties" : {
    "name" : {
      "type" : "string"
    },
    "capacity" : {
      "type" : "integer"
    },
    "animal" : {
      "type" : "object",
     "id" : "urn:jsonschema:com:schema:Cow",
  "properties" : {
    "name" : {
      "type" : "string"
    },
    "age" : {
      "type" : "integer"
    }
  }
    }
  }
}

or the similar with the sheep, basically, the concrete class of Animal

However, I am getting this: (Actual result)

{
  "type" : "object",
  "id" : "urn:jsonschema:com:schema:Farm",
  "properties" : {
    "name" : {
      "type" : "string"
    },
    "capacity" : {
      "type" : "integer"
    },
    "animal" : {
      "type" : "object",
      "id" : "urn:jsonschema:com:schema:Animal"
    }
  }
}

I went through the list of examples in TestGenerateJsonSchema class, however, it seems there is no example showing a nested class with concrete implementation of interface.

May I ask how to generate the schema for a nested class please?

Thank you

[pjfanning]

Our issue tracker is not for answering usage questions. Use stackoverflow or mail the jackson user mailing list - https://groups.google.com/g/jackson-user

Please also read https://github.com/FasterXML/jackson-module-jsonSchema#future-plans-lack-thereof

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