How can i fix this error retrieving data from firebase

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• Read each name in Array list to create seperate object for

  I have a file that has student names, age, and an id number. I have a student class that holds the everything above for each student object. I stored all the names, id numbers. and age separately in an array list. Now im trying to assign the info to create a student object.

  public class Student {
      private String lName;
      private int idNumber;
      private int age;
  
      public Student() {
          lName = "";
          idNumber = 0;
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          age = a;
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      public void setName(String last) {
          lName = last;
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      public String getName() {
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      public void setIdNum(int num) {
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      public int getIdNum() {
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      public void setAge(int a) {
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      public int getAge() {
          return age;
      }
  }
  

  My Text File looks something like this: This info is stored in parallel array lists. I don't quite get how to implement this into an object to pass it into my second contractor method.

    Josh          2134         19
    Smith         5256         21
    Rogers        9248         19
    Andrew        7742         20
  

  Here's what I've tried;

  public static void main(String[] args) {
      String file = "studentData.txt";
      Scanner reader = new Scanner(file);
  
      ArrayList<String> lastNames = lNames(file);
      ArrayList<Integer> idNumbers = idNum(file);
      ArrayList<Integer> ageList = ages(file);
  
      Scanner input = new Scanner(System.in);
  
      Student s1 = new Student();
  
      // confused about how to implement this constructor with the textile info
      for (int i = 0; i<idNumbers.size(); i++) {
          Student user = new Student(lastNames.get(i), idNumbers.get(i), ageList.get(i));
      }
  
      //user enters idNumber to display age
      System.out.println("Enter ID Number"); //exception handling to be added
      int idNum = input.nextInt();
  
      for (int i = 0; i<idNumbers.size(); i++) {
          if (idNum == idNumbers.get(i)) {
              s1.setAge(ageList.get(i));
              System.out.println(s1.getAge());
  
          }
      }
  }
  
• Using EdittextPreference for Goto search

  sorry for my poor English. I want to use EditTextPreference in my bottom nav like the pic below, ![screenshot][1]

  I have recycleview xml in my project with in many sub cardview layouts(which is scrollable) and I want to create item in the bottom nav which is called "Goto". When the "Goto" item is clicked i want it to pop-up like the screenshot. And when user enters a number(according to the cardviews i.e if the number of cardview is 40 user must enter 1-40) I want to search the cardview by its ID. Thank you and I hope u got it, If u have any questions let me know [1]: https://i.stack.imgur.com/grK8P.jpg

  My xml format look like this. As you see in the blow since the cardviews are huge in number it is not cool to scroll all the way down that is why i need Goto item in the bottom nav to search it by its ID when the user click number in the EditTextPreference as u see in the screenshot. i.e The screenshot is not from my app

  <LinearLayout>
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   <LinearLayout>
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  <LinearLayout>
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    <LinearLayout>
    <androidx.cardview.widget.CardView>
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      <RealtiveLayout>
   </androidx.cardview.widget.CardView>
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    ..
    ..
  
    ..
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• How to get remaining time of the day in java?

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  Expected answer: 18:10:19 or 65419 (in seconds).

  How can I achieve this with efficiently using java 8?
• Updating a Single Column In Room Database

  That's the function I'm using for updat

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• How can I fixed my problem"FirebaseError: Firebase: Error (auth/invalid-api-key)."

  My environment variable is ok. No comas and name mistakes but they given me error like "FirebaseError: Firebase: Error (auth/invalid-api-key)". How can I fixed it. Please Help me...

  This my .env file

  REACT_APP_apiKey=AIzaSyBWobnhbdeMdNpXXXXXXXXXXXXXXXXXXXX
  REACT_APP_authDomain=XXXXX.firebaseapp.com
  REACT_APP_projectId=XXXX
  REACT_APP_storageBucket=XXXXX.appspot.com
  REACT_APP_messagingSenderId=4997390XXXXX
  REACT_APP_appId=1:4997390XXXXX:web:cc7bc80aa1bdb78fXXXXXX
  REACT_APP_measurementId=G-M1XDXXXXXX
  

  This my firebase config file

  const firebaseConfig = {
    apiKey: process.env.REACT_APP_apiKey,
    authDomain: process.env.REACT_APP_authDomain,
    projectId: process.env.REACT_APP_projectId,
    storageBucket: process.env.REACT_APP_storageBucket,
    messagingSenderId: process.env.REACT_APP_messagingSenderId,
    appId: process.env.REACT_APP_appId,
    measurementId: process.env.REACT_APP_measurementId,
  };
  
  when I debugging firebaseConfig object
  
  console.log(firebaseConfig.apiKey);  ==========> undefined 
  console.log(firebaseConfig.authDomain);  ==========> undefined 
  console.log(firebaseConfig.projectId);  ==========> undefined 
  console.log(firebaseConfig.storageBucket); ==========> undefined 
  console.log(firebaseConfig.measurementId); ==========> undefined 
  console.log(firebaseConfig.appId); ==========> undefined 
  console.log(firebaseConfig.measurementId); ==========> undefined 
  
  

  client side given error this "FirebaseError: Firebase: Error (auth/invalid-api-key)"
• How to order comments in firebase firestore by createdAt

  I have a document in which there is a comments array of objects and each object has createdAt property. I want to sort all the comments that are inside the comments array using the createdAt property, so, a new comment comes to the top.

  I did some research and found that we can do this in firebase's real-time database but I want to do the ordering of data using firestore.

  Here is my code:

  import { useEffect, useRef, useState } from "react"
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  import { doc, onSnapshot, orderBy, query } from "firebase/firestore"
  
  import { db } from "../firebase/config"
  
  export const useDocument = (c, id, o) => {
    const [document, setDocument] = useState(null)
    const [error, setError] = useState(null)
  
    // realtime document data
    useEffect(() => {
      let docRef = doc(db, c, id)
  
      if (o) {
        docRef = query(docRef, orderBy("createdAt", "desc")) // this is not working
      }
  
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        docRef,
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          if (snapshot.data()) {
            setDocument({ ...snapshot.data(), id: snapshot.id })
            setError(null)
          } else {
            setError("No such document exists")
          }
        },
        (err) => {
          console.log(err.message)
          setError("failed to get document")
        }
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      // unsubscribe on unmount
      return () => unsubscribe()
    }, [c, id])
  
    return { document, error }
  }
  
  

  createdAt property:
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  I am making a chat application in flutter using firebase. I want to show a header with the date whenever the date changes. How can I group messages in flutter coming from firebase on the basis of date and show a header with the changed date?

  I have tried GroupedListView package but I was not able to retrieve the chatmessages successfully.
• Parse external JSON using Firebase Functions

  I just started using Firebase a couple of days ago for my mobile app, so I’m sorry if this might come off as a stupid question, I’m still learning :)

  Basically, what I want to achieve is to download and parse a JSON from an API and then store the parsed content in the Real Time Firebase Database, so I can later use it in my app. I want to achieve this with Firebase Functions, cause the JSON is pretty large and don’t want to process it on device, it would slow down the app. Basically I’d like for the parsing and storing to be done by one function, which would then automatically execute one time per day, at a given time. Is this something doable? Or should I be looking into Google Cloud for this type of thing.

  I’m also new to JavaScript, so an example function would be really useful, to get a sense of how things look and feel.

  Thank you so much!
• Why getting firebase is not defined error?

  Here's the code for firebase.js file where I m getting this error in spite of strictly adhering to the official documentation of firebase.

  Firebase.js

  import { initializeApp } from 'firebase/app';
  import { getFirestore ,getDocs} from 'https://www.gstatic.com/firebasejs/9.6.3/firebase-firestore.js' 
  import { collection} from 'https://www.gstatic.com/firebasejs/9.6.3/firebase-firestore.js' 
  // TODO: Add SDKs for Firebase products that you want to use
  // https://firebase.google.com/docs/web/setup#available-libraries
  
  // Your web app's Firebase configuration
  const firebaseConfig = {
    //config
  };
  
  // Initialize Firebase
  firebase.initializeApp(firebaseConfig);
  
• How to get the name of child realtime database kotlin

  I am trying to get the email (in this case mikeyreid2002@gmail.com) however I don't see any method I can use that gets me the name of the child instead of the value.

  https://i.stack.imgur.com/uzonn.png
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  Both the Http and Https firewall rules are enabled Whe I run the command

  sudo systemctl status apache2
  

  This is the result I get

  netstat -tulpn | grep LISTEN
  

  

  enter code here
  

  Any ideas on what the issue might be will be really helpful
• (Terraform) Error 400: Invalid request: instance name (pg_instance)., invalid

  On GCP, I'm trying to create a Cloud SQL instance with this Terraform code below:

  resource "google_sql_database_instance" "postgres" {
      name                = "pg_instance"
      database_version    = "POSTGRES_13"
      region              = "asia-northeast1"
      deletion_protection = false
  
      settings {
          tier      = "db-f1-micro"
          disk_size = 10
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  resource "google_sql_user" "users" {
      name     = "postgres"
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      password = "admin"
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  But I got this error:

  Error: Error, failed to create instance pg_instance: googleapi: Error 400: Invalid request: instance name (pg_instance)., invalid

  Are there any mistakes for my Terraform code?
• Apache beam FixedWindow doesn't do anything after GroupByKey transform

  I built a pipeline which reads from confluent kafka it processes the records and then use side outputs to split them into rejected and approved pcollections, then the approved pcollections gets written to bigquery, but I want to persist the approved records and write them into a file on gcs.

  The code is:

  windowing=(aproved
  | 'Create_window'  >> beam.WindowInto(window.FixedWindows(60))
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  | 'remove_key' >> beam.FlatMap(ret_key)
  | 'AddTimeStamp' >> beam.Map(lambda record: beam.window.TimestampValue(record,time.time()))
  | 'Write' >> WriteToFiles(path=MY_BUCKET,file_naming=destination_prefix_naming('.ppl'))
  )
  

  This works when I test it reading from a file and using direct runner, but when I use dataflow and streaming it just doesn't do anything after the GroupByKey transform, it says on the graph that 20 element were added, but the next transform ('remove_key') never gets an element after that