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public static void initWithAppDefaultCredentials() {
  // ADC does not require any explicit credential files.
  FirebaseOptions options = new FirebaseOptions.Builder()
    .setCredentials(GoogleCredentials.getApplicationDefault())
    .build();
  FirebaseApp.initializeApp(options);
}

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public static void initWithServiceAccountCredentials() {
  // Service account must be specified explicitly.
  FileInputStream serviceAccount = new FileInputStream("path/to/serviceAccount.json");
  FirebaseOptions options = new FirebaseOptions.Builder()
    .setCredentials(GoogleCredentials.fromStream(serviceAccount))
    .build();
  FirebaseApp.initializeApp(options);
}

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{
  "rules": {
    "users": {
      "$uid": {
        ".write": "$uid === auth.uid"
      }
    }
  }
}

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public static void initWithLimitedPrivileges() {
  // Initialize the app with a custom auth variable, limiting the server's access
  Map<String, Object> auth = new HashMap<String, Object>();
  auth.put("uid", "my-service-worker");

  FirebaseOptions options = new FirebaseOptions.Builder()
    .setCredentials(GoogleCredentials.getApplicationDefault())
    .setDatabaseUrl("https://databaseName.firebaseio.com")
    .setDatabaseAuthVariableOverride(auth)
    .build();

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import com.google.api.core.ApiFuture;
import com.google.api.core.ApiFutureCallback;
import com.google.api.core.ApiFutures;

@Deprecated
public void addTaskCallbacks(Task<String> task) {
  task.addOnSuccessListener(new OnSuccessListener<String>() {
    @Override
    public void onSuccess(String result) {
      System.out.println("Operation completed with result: " + result);

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import com.google.api.core.ApiFunction;
import com.google.api.core.ApiFuture;
import com.google.api.core.ApiFutures;

@Deprecated
public Task<List<String>> continueWithTask(Task<String> task) {
  return task.continueWith(new Continuation<String, List<String>>() {
    @Override
    public List<String> then(Task<String> task) throws Exception {
      String result = task.getResult();

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import com.google.api.core.ApiFutures;
import com.google.firebase.tasks.Tasks;

String value = "value";
Exception error = new Exception("custom error");

// Wrap in Tasks
Task<String> valueTask = Tasks.forResult(value);
Task<String> exceptionTask = Tasks.forException(error);

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import com.google.firebase.tasks.Tasks;

@Deprecated
public String waitForTask(Task<String> task) {
  try {
    return Tasks.await(task);
  } catch (ExecutionException | InterruptedException e) {
    throw new RuntimeException("Error while waiting for task", e);
  }
}

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import com.google.api.core.SettableApiFuture;
import com.google.firebase.tasks.TaskCompletionSource;

@Deprecated
public Task<String> incompleteTask() {
  final TaskCompletionSource<String> source = new TaskCompletionSource<>();
  new Thread() {
    @Override
    public void run() {
      try {

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// Start listing users from the beginning, 1000 at a time.
ListUsersPage page = FirebaseAuth.getInstance().listUsersAsync(null).get();
while (page != null) {
  for (ExportedUserRecord user : page.getValues()) {
    System.out.println("User: " + user.getUid());
  }
  page = page.getNextPage();
}

// Iterate through all users. This will still retrieve users in batches,