Nothing happens, unable to generate from OpenAPI JSON Schema

I am trying to leverage the OpenAPI JSON Schema, to validate some user provided OpenAPI definitions. When trying to use the maven-plugin or the jsonschema2pojo website, I get no results.

JSON Schema: https://raw.githubusercontent.com/OAI/OpenAPI-Specification/main/schemas/v3.1/schema.json

             <plugin>
                <groupId>org.jsonschema2pojo</groupId>
                <artifactId>jsonschema2pojo-maven-plugin</artifactId>
                <version>1.1.2</version>
                <configuration>
                    <sourceType>jsonschema</sourceType>
                    <sourceDirectory>${basedir}/src/main/resources/schemas</sourceDirectory>
                    <targetPackage>com.example.openapi</targetPackage>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

[eirnym]

Yes, this has been changed since version 2019-09. Versions below (e.g. draft-0[1-7]) has this explicit restriction

[joelittlejohn]

It’s possible to have a JSON schema with no meaningful rules or types to generate. This means the plugin has done its work but there is nothing to do.

Until recent versions, the JSON schema spec explicitly mentioned that the presence of $ref in a schema should mean that all other keys in the schema must be ignored. So this is what jsonschema2pojo does. I believe that this may have changed in recent versions of the JSON schema spec, however we should find an explicit reference.