Firebase Java Admin SDK don't work

Question

I am following the documentation on Firebase website on setting up an Java Admin SDK. So I add the dependency to the build.gradle, and added the following code:

Answer 1

below code is pushing data into firebase database using java async call api from firebase sdk but listeners code is not executing . I am running below code in server side backend.

 public enum Firebase {
INSTANCE;

FirebaseApp firebaseApp;


public void initilizeFirebaseApp(ConfigLoader configReader) {

    CountDownLatch done = new CountDownLatch(1);
    final AtomicInteger message1 = new AtomicInteger(0);
    InputStream firebaseSecret = getClass().getClassLoader().getResourceAsStream("ServiceAccount.json");
    final GoogleCredentials credentials;
    try {
        credentials = GoogleCredentials.fromStream(firebaseSecret);
    } catch (IOException e) {
        e.printStackTrace();
        System.out.println("Error while reading Firebase config file." + e.toString());
        throw new IllegalStateException(e);
    }

    Map auth = new HashMap<>();
    auth.put("uid", "my_resources");

    FirebaseOptions options = new Builder()
            .setConnectTimeout(1000)
            .setCredentials(credentials)
            .setDatabaseAuthVariableOverride(auth)
            .setDatabaseUrl(configReader.getFirebaseDatabaseURL())
            .setStorageBucket(configReader.getFirebaseStorageBucket())
            .setProjectId(configReader.getFirebseProjectId())
            .build();

    firebaseApp = FirebaseApp.initializeApp(options);


    System.out.println(firebaseApp.getName());
    //System.out.println(firebaseApp.getName());
    // Use the shorthand notation to retrieve the default app's service
    FirebaseAuth defaultAuth = FirebaseAuth.getInstance();
    FirebaseDatabase defaultDatabase = FirebaseDatabase.getInstance();


    // The app only has access as defined in the Security Rules
    DatabaseReference ref = FirebaseDatabase
            .getInstance()
            .getReference("/analyst_profiles");


    DateTime dt = new DateTime(java.util.Date.from(Instant.now()), java.util.TimeZone.getDefault());
    System.out.println(dt.getValue());
    //test data push
    // https://firebase.google.com/docs/database/admin/save-data
    AnalystProfiles analystProfilesObjTemp = new AnalystProfiles("test2", Long.toString(dt.getValue()), "dsds", "ds", "ds",
            "dsa2323", "32ddss232");

    ref.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            AnalystProfiles post = dataSnapshot.getValue(AnalystProfiles.class);
            System.out.println(post);
            //done.countDown();
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            System.out.println("The read failed: " + databaseError.getCode());
        }


    });


    CompletableFuture welcomeText = CompletableFuture.supplyAsync(() -> {
        try {
            ref.push().setValueAsync(analystProfilesObjTemp).get();
        } catch (ExecutionException | InterruptedException e) {
            throw new RuntimeException("Error while waiting for future", e);
        }
        return "ok";

    }).thenApply(x -> {
        System.out.println(x);
        System.out.println("Listeners code is not executing");
        return x;
    });


    done.countDown();
    try {
        System.out.println(welcomeText.get());
        done.await();
    } catch (InterruptedException e) {
        e.printStackTrace();
    } catch (ExecutionException e) {
        e.printStackTrace();
    }


}


public void testdataLoad() {

    // The app only has access as defined in the Security Rules
    DatabaseReference ref = FirebaseDatabase
            .getInstance()
            .getReference("/analyst_profiles");


    DateTime dt = new DateTime(java.util.Date.from(Instant.now()), java.util.TimeZone.getDefault());
    System.out.println(dt.getValue());
    //test data push
    // https://firebase.google.com/docs/database/admin/save-data
    AnalystProfiles analystProfilesObjTemp = new AnalystProfiles("test2", Long.toString(dt.getValue()), "dsds", "ds", "ashutsh",
            "dsa2323", "32ddss232");

    CompletableFuture welcomeText = CompletableFuture.supplyAsync(() -> {
        try {
            ref.push().setValueAsync(analystProfilesObjTemp).get();
        } catch (ExecutionException | InterruptedException e) {
            throw new RuntimeException("Error while waiting for future", e);
        }
        return "ok";

    }).thenApply(x -> {
        System.out.println(x);
        return x;
    });



    try {
        System.out.println(welcomeText.get());

    } catch (InterruptedException e) {
        e.printStackTrace();
    } catch (ExecutionException e) {
        e.printStackTrace();
    }

}

}