Getting NullPointerException for AccessToken

[BaljitKarwal]

I am new to firebase however I did setup service account in console and used "messaging.java". Downloaded proper json file and updated all required variables in file.

I am getting this error now for getting access token from GoogleCredentials. I am unable to figure out what am I missing. Is it any variable misisng in my credentials file? or scope?

java.lang.NullPointerException at Messaging.getAccessToken

Can someone please advise? Below is my code:

` private static final String PROJECT_ID = "";
private static final String BASE_URL = "https://fcm.googleapis.com";
private static final String FCM_SEND_ENDPOINT = "/v1/projects/" + PROJECT_ID + "/messages:send";

private static final String MESSAGING_SCOPE = "https://www.googleapis.com/auth/firebase.messaging";
private static final String[] SCOPES = { MESSAGING_SCOPE };

private static final String TITLE = "FCM Notification";
private static final String BODY = "Notification from FCM";
public static final String MESSAGE_KEY = "message";
public static final String FIREBASE_SERVICE_PATH = "firebase_service_account/google-services.json";

/**

• Retrieve a valid access token that can be use to authorize requests to the FCM REST
• API.
• @return Access token.
• @throws IOException
  */
  private static String getAccessToken() throws IOException {
  GoogleCredentials googleCredentials = GoogleCredentials
  .fromStream(new FileInputStream(FIREBASE_SERVICE_PATH));
  try {
  googleCredentials.getAuthenticationType();
  googleCredentials.refreshAccessToken();
  } catch (IOException e) {
  e.printStackTrace();
  }
  return googleCredentials.getAccessToken().getTokenValue();
  }`

Regards
Baljit

[BaljitKarwal]

I found solution for this, using below code of line before calling AccessToken();
googleCredentials.refreshIfExpired();
and removed googleCredentials.refreshAccessToken();

[huSSooxXx]

I found solution for this, using below code of line before calling AccessToken(); googleCredentials.refreshIfExpired(); and removed googleCredentials.refreshAccessToken();

I just changed below and its worked

        googleCredentials.refreshIfExpired();
        //googleCredentials.refreshAccessToken();

Thank you @BaljitKarwal

[SEOJAEHWA]

I found solution for this, using below code of line before calling AccessToken(); googleCredentials.refreshIfExpired(); and removed googleCredentials.refreshAccessToken();

It works. thanks.

[dineshsraman]

I'm also using similar code, but its throwing error. Any help?

Code:
private static String getAccessToken() throws IOException {
String[] SCOPES = {"https://www.googleapis.com/auth/firebase.messaging"};

    GoogleCredentials googleCredentials = GoogleCredentials.fromStream(new FileInputStream("./src/service-account.json")).createScoped(Arrays.asList(SCOPES));
    //googleCredentials.refresh();
    try {
    	googleCredentials.getAuthenticationType();
    	googleCredentials.refreshIfExpired();
    } catch (IOException e) {
    	e.printStackTrace();
    }
    
    return googleCredentials.getAccessToken().getTokenValue();
    
	}

Error from refreshIfExpired call: Error getting access token for service account: Remote host terminated the handshake, iss: firebase-adminsdk-jnf15@*****

[BaljitKarwal]

I'm also using similar code, but its throwing error. Any help?

Code: private static String getAccessToken() throws IOException { String[] SCOPES = {"https://www.googleapis.com/auth/firebase.messaging"};

    GoogleCredentials googleCredentials = GoogleCredentials.fromStream(new FileInputStream("./src/service-account.json")).createScoped(Arrays.asList(SCOPES));
    //googleCredentials.refresh();
    try {
    	googleCredentials.getAuthenticationType();
    	googleCredentials.refreshIfExpired();
    } catch (IOException e) {
    	e.printStackTrace();
    }
    
    return googleCredentials.getAccessToken().getTokenValue();
    
	}

Error from refreshIfExpired call: Error getting access token for service account: Remote host terminated the handshake, iss: firebase-adminsdk-jnf15@*****

I would suggest checking your JAVA_HOME and TLS versions.

[thuannd97]

I found solution for this, using below code of line before calling AccessToken(); googleCredentials.refreshIfExpired(); and removed googleCredentials.refreshAccessToken();

It's worked for me. Thank u