import org.gradle.internal.resource.transfer.ExternalResourceConnector;

import java.util.Collections;
import java.util.Set;

import static java.util.Collections.emptySet;

public class GcsConnectorFactory implements ResourceConnectorFactory {

    @Override
    public Set<String> getSupportedProtocols() {
        return Collections.singleton("gcs");
    }

    @Override

    }

    private static class GlobalScopeServices implements ServiceRegistrationProvider {
        @Provides
        ResourceConnectorFactory createGcsConnectorFactory() {
            return new GcsConnectorFactory();
        }
    }

Class <org.gradle.internal.resource.transport.gcp.gcs.GcsConnectorFactory> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (GcsConnectorFactory.java:0)
Class <org.gradle.internal.resource.transport.gcp.gcs.GcsResource> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (GcsResource.java:0)