Learn
Software Engineering
Web Platform
Java Spring Boot
Tutorials
Quick Start

Quick Start

Learn core Spring Boot concepts and web development patterns. This Quick Start teaches essential Spring Boot skills.

🎯 What You’ll Learn

By the end of this tutorial, you’ll understand:

  • REST controllers and request mapping
  • Dependency injection
  • Configuration properties
  • JPA and database access

📋 Prerequisites

🛣️ REST Controllers 

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

    @GetMapping
    public List<User> getAllUsers() {
        return userService.findAll();
    }

    @GetMapping("/{id}")
    public User getUser(@PathVariable Long id) {
        return userService.findById(id);
    }

    @PostMapping
    public User createUser(@RequestBody User user) {
        return userService.save(user);
    }

    @PutMapping("/{id}")
    public User updateUser(@PathVariable Long id, @RequestBody User user) {
        return userService.update(id, user);
    }

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

🔧 Dependency Injection 

@Service
public class UserService {
    private final UserRepository userRepository;

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

    public List<User> findAll() {
        return userRepository.findAll();
    }
}

⚙️ Configuration Properties

Create src/main/resources/application.properties:

server.port=8080
spring.application.name=myapp

# Database
spring.datasource.url=jdbc:postgresql://localhost:5432/mydb
spring.datasource.username=postgres
spring.datasource.password=secret

# JPA
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true

Or use application.yml:

server:
  port: 8080

spring:
  application:
    name: myapp
  datasource:
    url: jdbc:postgresql://localhost:5432/mydb
    username: postgres
    password: secret
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true

📊 JPA and Database 

@Entity
@Table(name = "users")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(nullable = false)
    private String name;

    @Column(nullable = false, unique = true)
    private String email;

    // Getters and setters
}

public interface UserRepository extends JpaRepository<User, Long> {
    Optional<User> findByEmail(String email);
    List<User> findByNameContaining(String name);
}

✅ Next Steps

You now understand Spring Boot essentials!

  1. Try the examples: Build REST APIs and services
  2. Explore By Example: Java Spring Boot By Example

🎯 Self-Assessment

After completing this Quick Start, you should be able to:

  • Create REST controllers
  • Use dependency injection
  • Configure application properties
  • Work with JPA and databases
Last updated
Initial Setup