Applying schema defaults does not compute $ref

[ilPittiz]

More of a feature request than an issue: I followed the JSON Schema Walkers guide about applying defaults, and expected default values to be also computed when the related schema node is a reference, instead of 'inline' schema nodes as per PropertiesValidator#getDefaultNode(Map.Entry<String, JsonSchema>)

Example:

schema.json

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "",
  "type": "object",
  "properties": {
    "s": {
      "type": "string",
      "default": "S"
    },
    "ref": { "$ref": "#/$defs/r" }
  },
  "required": [ "s", "ref" ],

  "$defs": {
    "r": {
      "type": "string",
      "default": "REF"
    }
  }
}

Code:

JsonSchemaFactory schemaFactory = JsonSchemaFactory.getInstance(SpecVersion.VersionFlag.V202012);
SchemaValidatorsConfig schemaValidatorsConfig = new SchemaValidatorsConfig();
schemaValidatorsConfig.setApplyDefaultsStrategy(new ApplyDefaultsStrategy(true, true, true));
schemaValidatorsConfig.setLoadCollectors(true)
JsonSchema jsonSchema = schemaFactory.getSchema(getClass().getClassLoader().getResourceAsStream("schema.json"), schemaValidatorsConfig);

JsonNode inputNode = objectMapper.readTree('{}');
ValidationResult result = jsonSchema.walk(inputNode, true);

System.out.println(inputNode.toString());
System.out.println(result.getValidationMessages());

Output:

{"s":"S"}
[$.ref: is missing but it is required]

Having instead as output

{"s":"S","ref":"REF"}
[]

would be a total game-changer for me: the project I'm working on has a huge amount of shared 'components', referenced across all local JSON schemas validating user input, and adding the default values across these local JSON schemas is simply not doable.