spring-cloud-gcp-pubsub-example-HelloPubSubPublisher.java

@Component
public class HelloPubSubPublisher extends PubSubPublisher {

    @Autowired
    public HelloPubSubPublisher(PubSubTemplate pubSubTemplate) {
        super(pubSubTemplate);
    }

    @Override
    protected String topic() {
        return "hello-pubsub";
    }

}