Ref to another json schema doesn`t work

[HalinaPichukha]

Hello :)

I want to implement referensing to the child json schema from the parent one.

I have main json schema "parent-validation-schema.json":
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"title": "parentschema",
"type": "object",
"properties": {
"myProperty": {
"$ref": "./child-validation-schema.json"
}
}
}

and the child-validation-schema.json:
{
"title": "child schema",
"type": "object",
"properties": {
"myProperty": {
"type": "String"
}
}
}

Also I configured JsonSchemaFactory and JsonSchema (it works grait for the single json schema):

public class JsonSchemaValidator implements EventValidator {

private final JsonSchema jsonSchema;

public JsonSchemaValidator() {
final var factory = JsonSchemaFactory.getInstance(V202012);
jsonSchema = factory.getSchema(JsonSchemaValidator.class.getResourceAsStream("/parent-validation-schema.json"));
jsonSchema.createExecutionContext().getExecutionConfig().setFormatAssertionsEnabled(true);
}
}

They are located on the same directory.

I`m basing on the test cases in your repo:
https://github.com/networknt/json-schema-validator/blob/master/src/test/resources/schema/main/main.json
https://github.com/networknt/json-schema-validator/blob/master/src/test/resources/schema/common/child.json
https://github.com/networknt/json-schema-validator/blob/master/src/test/resources/schema/common/child2.json

But I get error: URI is not absolute.

I case I use "$ref": "file:./child-validation-schema.json" or "$ref": "classpath./child-validation-schema.json" I don`t get any errors, but only the main (parent) validation schema works, and the nested (child) is ignored.

Could you please help me with this issue? :)
Thanks a lot!

[justin-tay]

A relative IRI $ref needs a base IRI to resolve. As you are using an InputStream to load your parent schema and there is no $id defined there is no base IRI.

Instead of

jsonSchema = factory.getSchema(JsonSchemaValidator.class.getResourceAsStream("/parent-validation-schema.json"));

You can try

jsonSchema = factory.getSchema(SchemaLocation.of("classpath:/parent-validation-schema.json"));

Also this line doesn't do anything meaningful as you created an execution context and set the config but never stored the reference to it in order to pass it somewhere.

jsonSchema.createExecutionContext().getExecutionConfig().setFormatAssertionsEnabled(true);

Typically this is done by passing a lambda as a parameter to validate if you want to customize the execution context for that run.

Set<ValidationMessage> messages = schema.validate(inputData, InputFormat.JSON, executionContext -> {
    executionContext.getExecutionConfig().setFormatAssertionsEnabled(true);
});