Java Capstone Project

Congratulations — you have reached the final lesson of the Java course. This capstone project brings together everything you learned across core Java, OOP, Spring Boot, REST APIs, Hibernate, and database integration.

This lesson is designed to simulate how Java is used in real companies. Instead of learning isolated concepts, you will now see how everything works together as a complete backend system.

Project Overview

You will build a User Management Backend System. This is a simplified version of systems used in real applications such as:

• Employee management platforms
• Admin dashboards
• Customer management systems
• Internal company tools

The backend will expose REST APIs and store data in a database.

Project Features

• Create new users
• View all users
• Update user information
• Delete users
• Store data using Hibernate

This project reflects what junior Java backend developers build in real-world jobs.

Project Architecture

The application follows the standard layered architecture:

• Controller – handles HTTP requests
• Service – contains business logic
• Repository – handles database operations
• Entity – represents database tables

This structure keeps the application clean and scalable.

Entity Class

The User entity represents the database table.

@Entity
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;

    private String name;
    private String email;
}

Repository Layer

The repository connects Hibernate with the database.

public interface UserRepository 
        extends JpaRepository {
}

Service Layer

The service layer contains business logic.

@Service
public class UserService {

    private final UserRepository userRepository;

    public UserService(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    public List getAllUsers() {
        return userRepository.findAll();
    }

    public User saveUser(User user) {
        return userRepository.save(user);
    }

    public void deleteUser(int id) {
        userRepository.deleteById(id);
    }
}

Controller Layer

The controller exposes REST APIs.

@RestController
@RequestMapping("/users")
public class UserController {

    private final UserService userService;

    public UserController(UserService userService) {
        this.userService = userService;
    }

    @GetMapping
    public List getUsers() {
        return userService.getAllUsers();
    }

    @PostMapping
    public User addUser(@RequestBody User user) {
        return userService.saveUser(user);
    }

    @DeleteMapping("/{id}")
    public void deleteUser(@PathVariable int id) {
        userService.deleteUser(id);
    }
}

How This Works in Real Life

A frontend application sends HTTP requests to these APIs.

• POST /users → create user
• GET /users → fetch users
• DELETE /users/{id} → remove user

The backend processes requests and communicates with the database.

What You Have Achieved

By completing this project, you have learned how to:

• Design backend architecture
• Build REST APIs
• Use Hibernate for database access
• Write clean, maintainable Java code

This skill set is enough to apply for Java backend and Spring Boot roles.

Career Perspective

Most Java backend interviews expect candidates to explain:

• Spring Boot architecture
• REST API flow
• Hibernate mapping and CRUD
• Layered application design

You now have practical knowledge of all these areas.

Next Steps

From here, you can:

• Build larger Spring Boot projects
• Add authentication and security
• Connect frontend frameworks
• Explore microservices

Java is a vast ecosystem — this course has given you a strong foundation.