Why my Realtime Database Data is not showing anything in Firebase?

Question

I am doing a Android Studio Project with Firebase but I can't view the data in the Realtime Database. It seems successfully connected because I can see my data in the Authentication (User) but not displaying in Realtime database. Please help me. I have also turn the rules into true. But still my Firebase data showing south-masalaa-default-rtbd:null

mAuth.createUserWithEmailAndPassword(CustEmail, CustPass)
    .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {

            if(task.isSuccessful())
            {
                User user = new User(CustName, CustEmail, CustPhoneNumber, CustPass );
                FirebaseDatabase.getInstance().getReference("User")
                        .child(FirebaseAuth.getInstance().getCurrentUser().getUid())
                        .setValue(user).addOnCompleteListener(new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        if(task.isSuccessful())
                        {
                            Toast.makeText(SignUp.this, "Successful Registered", Toast.LENGTH_LONG).show();
                        }
                        else
                        {
                            Toast.makeText(SignUp.this, "Not successful", Toast.LENGTH_LONG).show();
                        }
                    }
                });
            } else
            {
                Toast.makeText(SignUp.this, "Failed to register the user", Toast.LENGTH_LONG).show();
            }
        }
    });

Answer 1

You can specify the full database URL in the call to getInstance() like this:

FirebaseDatabase.getInstance("your database URL").getReference()