react native firebase fcm (firebase messaging cloud) + java spring boot: how to push notification

@Slf4j @SpringBootTest public class FcmTests { @Autowired FirebaseMessaging firebaseMessaging; @Test public void test1() throws FirebaseMessagingException { log.info("FCM Sending..."); List<String> registrationTokens = Collections.singletonList("<your fcm token here>"); // iOS Config Aps aps = Aps.builder() .setContentAvailable(true) .build(); ApnsConfig apnsConfig = ApnsConfig.builder() .setAps(aps) .build(); // android config AndroidConfig androidConfig = AndroidConfig.builder() .setPriority(AndroidConfig.Priority.HIGH) .build(); MulticastMessage message = MulticastMessage.builder() .putData("title", "you can do everything") .putData("id", "1") .putData("body", "jumppp....") .setAndroidConfig(androidConfig) .setApnsConfig(apnsConfig) .addAllTokens(registrationTokens) .build(); BatchResponse response = firebaseMessaging.sendMulticast(message); // See the BatchResponse reference documentation // for the contents of response. log.info("FCM Send success count=[{}]", response.getSuccessCount()); } }