ID is required to invoke public resource.Metadata$Service.getId() #53

public class TestMetadata {

    public static void main(String arg[]){
        String privateEndPoint = "https://api.service.softlayer.com/rest/v3/";
        ApiClient client = new RestApiClient(privateEndPoint);

        Metadata.Service metadataService = Metadata.service(client);

        try {            
            long id = metadataService.getId();            
            System.out.println("This VSI ID is " + id);            
        } catch (Exception e) {            
            System.out.println("SoftlayerMetadata error in " + e);
        }
    }
}

        @ApiMethod(instanceRequired = true)
        public Long getId();