In your class autowire (@@Autowired for Spring or @Inject for Guice)
@Autowired
private IMessagingFactory messagingFactory;
import io.gitbub.devlibx.easy.helper.json.JsonUtils;
Object logEvent = ...
messagingFactory.getProducer("updateUserEvent")
.ifPresent(producer -> producer.send(key, JsonUtils.asJson(logEvent)));