Java | Spring Boot Project | Firebase For Database | GitHub | Heroku To Deploy Project LIVE

STEP 1: Create Spring Boot Web Project

From your IDE:

• Create New Spring Starter Project

• Select Web

• Create packages:

com.example.demo
com.example.demo.controller
com.example.demo.dbinit
com.example.demo.model
com.example.demo.service

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STEP 2: Initialize Firebase

Create class in dbinit package:

@Service
public class InitializeFirebase {

    @PostConstruct
    public void initializeFirebase() throws IOException {
    }

}

@PostConstruct ensures the method runs automatically on app startup.

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STEP 3: Firebase Login & Firestore Setup

• Open Firebase Console

• Choose Cloud Firestore

• Click Start Collection

• Collection ID: beginner

• Document ID: anything (e.g., xyz123)

• Field example:
  id = "xyz123"

Document ID can be auto-generated or same as your model's ID.

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STEP 4: Firestore Connection Code

Go to:

Project Settings → Service Accounts → Java → Generate Code

Copy the code snippet provided.

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STEP 5: Initialize Firebase in Project

Paste code inside initializeFirebase():

@PostConstruct
public void initializeFirebase() throws IOException {

    FileInputStream serviceAccount =
        new FileInputStream("AAAAAAA.json");

    FirebaseOptions options = new FirebaseOptions.Builder()
        .setCredentials(GoogleCredentials.fromStream(serviceAccount))
        .setDatabaseUrl("https://BBBBBBB.com")
        .build();

    FirebaseApp.initializeApp(options);
}

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STEP 6: Add Firebase Dependencies

• Go to Maven Repository

• Search firebase-admin

• Use a compatible version (example: 6.11.0)

• Add in pom.xml

• Import Firebase classes

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STEP 7: Generate Private Key

In Service Accounts:

• Click Generate New Private Key

• Download the .json file

• Paste it inside the project root

• Replace:

FileInputStream serviceAccount =
    new FileInputStream("./<filename>.json");

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STEP 8: Create Model – Student

Fields:

id
name
age
place

Generate:

• constructors

• getters/setters

• toString()

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STEP 9: Create home.jsp

Path: src/main/webapp/home.jsp

<form action="/save">
    id: <input type="text" name="id" value="1000"><br>
    name: <input type="text" name="name"><br>
    age: <input type="text" name="age"><br>
    place: <input type="text" name="place"><br>
    <input type="submit" value="save">
</form>

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STEP 10: Controller Setup

@Controller
public class StudentController {

    @RequestMapping("/")
    public String home() {
        return "home.jsp";
    }
}

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STEP 11: Add Tomcat Jasper (for JSP)

If page doesn’t load, add Tomcat Jasper:

• Search tomcat-embed-jasper

• Version must match tomcat-embed-core

• Add dependency to pom.xml

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STEP 12: Relaunch Project

Now JSP loads properly at:

http://localhost:8080/

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STEP 13: Controller Save Method

@RequestMapping("/save")
public String saveStudent(Student student) {

    System.out.println("successfully saved");
    return "home.jsp";
}

Console prints "successfully saved" → Controller working.

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STEP 14: Create Service Class

@Service
public class StudentService {

    public static void saveStudent(Student student) {

    }
}

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STEP 15: Firebase Code to Save Data

public static void saveStudent(Student student) {

    Firestore dbFirestore = FirestoreClient.getFirestore();
    ApiFuture<WriteResult> future = dbFirestore
        .collection("beginner")
        .document(student.getId())
        .set(student);
}

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STEP 16: Call Service From Controller

@RequestMapping("/save")
public String saveStudent(Student student) {

    StudentService.saveStudent(student);
    System.out.println("successfully saved");
    return "home.jsp";
}

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STEP 17: Add Data to Firebase

• Relaunch project

• Submit form

• Check Firestore
  → Data stored successfully

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STEP 18: Push Project to GitHub

Commands:

cd "<path>"
git init
git remote add origin <repo-link>

# If reinitialized
rm -rf .git
git init

git add .
git commit -m "first commit"
git branch -M main
git push -u origin main

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STEP 19: Deploy Spring Boot App to Heroku

1. Login to Heroku

2. Create New App
   Example: test

3. Connect to GitHub

4. Authorize (first time only)

5. Select repository

6. Enable Automatic Deploy

7. Click Deploy Branch

8. After deployment → Heroku gives URL

Example:

https://test.herokuapp.com/

Your project is now LIVE.

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✔ End

-- Thanks --