Where can I get "serviceAccountCredentials.json" for Firebase Admin?

Here is said what I need to setup Firebase on java:

FirebaseOptions options = new FirebaseOptions.Builder()
    .setDatabaseUrl("https://databaseName.firebaseio.com")
    .setServiceAccount(new FileInputStream("path/to/serviceAccountCredentials.json"))
    .build();
FirebaseApp.initializeApp(options);

But where can I get serviceAccountCredentials.json ?

UPDATED: I found that this file seems should have this fields, but where get this values?

{
  "type": "",
  "project_id": "",
  "private_key_id": "",
  "private_key": "",
  "client_email": "",
  "client_id": "",
  "auth_uri": "",
  "token_uri": "",
  "auth_provider_x509_cert_url": "",
  "client_x509_cert_url": ""
}

Found details about this in this link

[UPDATED 30.11.2021] > To generate a private key file for your service account: > > In the Firebase console, open Settings > Service Accounts. > > Click Generate New Private Key, then confirm by clicking Generate Key. > > Securely store the JSON file containing the key. > > When authorizing via a service account, you have two choices for > providing the credentials to your application. You can either set the > GOOGLE_APPLICATION_CREDENTIALS environment variable, or you can > explicitly pass the path to the service account key in code. The first > option is more secure and is strongly recommended.

NB: When you generate a new private key, the old key will stop working immediately

To create the a new private key file you need to go to this link

https://console.firebase.google.com/project/**YOUR_PROJECT**/settings/serviceaccounts/adminsdk

[OLD]

Quote from firebase docs: > 2. Navigate to the Service Accounts tab in your project's settings page.
> 3. Click the Generate New Private Key button at the bottom of the Firebase Admin SDK section of the Service Accounts tab. > > After you click the button, a JSON file containing your service > account's credentials will be downloaded. You'll need this to > initialize the SDK in the next step. > > Warning: Use extra caution when > handling service account credentials in your code. Do not commit them > to a public repository, deploy them in a client app, or expose them in > any way that could compromise the security of your Firebase project. > > This file is only generated once. If you lose or leak the key, you can > repeat the instructions above to create a new JSON key for the service > account.

You can directly go to your Firebase portal --> Project Settings then Service accounts. I made a tutorial that explain all the details : How to get my Firebase Service Account Key file