Firebase Cloud Messaging (FCM) Access Token Issue

[mostafamahmoud2015]

Hello,

i'm trying to send message via Firebase Cloud Messaging but i received the below error so can you please help in fixing this issue

java.util.concurrent.ExecutionException: com.google.firebase.messaging.FirebaseMessagingException: Error while calling FCM backend service
..

Caused by: java.io.IOException: Error getting access token for service account: connect timed out

code snippets :-
FileInputStream serviceAccount =
new FileInputStream("serviceAccountKey.json");

			FirebaseOptions options = new FirebaseOptions.Builder()
			  .setCredentials(GoogleCredentials.fromStream(serviceAccount))
			  .setDatabaseUrl("https://testnf-42343.firebaseio.com")
			  .build();

	FirebaseApp defaultApp =FirebaseApp.initializeApp(options);
	System.err.println(defaultApp.getName());
	
	UUID uuid = UUID.randomUUID();

	String registrationToken = FirebaseAuth.getInstance().createCustomToken(uuid.toString());


	// See documentation on defining a message payload.
	Message message = Message.builder()
	    .putData("score", "850")
	    .putData("time", "2:45")
	    .setToken(registrationToken)
	    .build();

	// Send a message to the device corresponding to the provided
	// registration token.
	FirebaseMessaging instance = FirebaseMessaging.getInstance();
	String response;
	try {
		response = instance.sendAsync(message).get();

// response = instance.send(message);
// Response is a message ID string.
System.out.println("Successfully sent message: " + response);
} catch (Exception e) {
e.printStackTrace();
}

[codyoss]

To me this sounds like a firewall issue with the timeout. Can you run curl -I "https://oauth2.googleapis.com/token" from where ever your code is running?

[mostafamahmoud2015]

Hello, After debugging inside sdk I found that it is trying to connect to https://oauth2.googleapis.com/token but this URL is not working. Is this URL is correct? I tried to open it but I got bttp error 404 with/without firewall

…

On Tue, Dec 17, 2019, 7:30 PM Cody Oss ***@***.***> wrote: To me this sounds like a firewall issue with the timeout. Can you run curl -I "https://oauth2.googleapis.com/token" from where ever your code is running? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#917?email_source=notifications&email_token=AD5HJ557NFNO54H4EABLHZTQZD5CBA5CNFSM4J3GZ27KYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEHDEBZY#issuecomment-566640871>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AD5HJ56WQLKRWZZVZXQBBOLQZD5CBANCNFSM4J3GZ27A> .

[codyoss]

Yes that is correct, although Firebase does have its own auth as well: https://firebase.google.com/docs/auth Are you still having issues?

[mostafamahmoud2015]

it was firewall issue , thanks alot

…

On Fri, Jan 3, 2020 at 1:38 AM Cody Oss ***@***.***> wrote: Yes that is correct, although Firebase does have its own auth as well: https://firebase.google.com/docs/auth Are you still having issues? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#917?email_source=notifications&email_token=AD5HJ57TG5ZO64XTSK67E7TQ3ZUFHA5CNFSM4J3GZ27KYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEH7VKDA#issuecomment-570381580>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AD5HJ57YDLTJRHO5DYVOV3TQ3ZUFHANCNFSM4J3GZ27A> .

[willian-kaminski]

hy guys!

I'm trying to notify my app using the FCM but when i send the request i'm surprised by an exception.

My send code:

`
try{

        Message message = Message.builder()
                .putData("test", "test")
                .putData("test", "test")
                //.setToken("dla3GnhWQjc:APA91bH3dE2St0dLPMmhhTThgrpYSx7yY7gkR7sx_xL8DcQcDiCla_DtoJrhG-_uJFn9pmdwm78-0UcHIwJz1oplOb7n-P2n3FZY2vh1d1YP_Nirtt7NLVbQgDObQyLNwLQ0fr1JBEA6")
                .setTopic(topic)
                .build();

        // Send a message to the device corresponding to the provided
        // registration token.
        String response = FirebaseMessaging.getInstance().send(message);
        // Response is a message ID string.
        System.out.println("Successfully sent message: " + response);

    }catch (FirebaseMessagingException e) {
        System.out.println(e.getMessage());
    }

`

Excepiton:

java.io.IOException: Error getting access token for service account:
Error while calling FCM backend service

can you help me?

[willian-kaminski]

I've already checked the credentials and firewall issue

[codyoss]

Please open a new issue as this is a different exception.