Spring Boot Tutorial 0/110 lessons ~6 min read Lesson 17“Production-grade backends”

CRUD API Development

Time to ship a real CRUD API: Create, Read, Update, Delete for a Product resource — the workhorse pattern of every backend job interview.

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Focus

2 guided sections

Practice signal

Examples included

Career prep

Foundation builder

Introduction

Time to ship a real CRUD API: Create, Read, Update, Delete for a Product resource — the workhorse pattern of every backend job interview.

Informative example

Controller, service, repository — full vertical slice:

// Entity
@Entity @Table(name = "products")
public class Product {
  @Id @GeneratedValue Long id;
  @Column(nullable = false) String name;
  @Column(nullable = false) int priceCents;
  // getters / setters or use Lombok @Data
}

// Repository
public interface ProductRepository extends JpaRepository<Product, Long> {
  Page<Product> findByNameContainingIgnoreCase(String q, Pageable p);
}

// DTOs
record ProductDto(Long id, String name, int priceCents) {}
record NewProduct(@NotBlank String name, @Positive int priceCents) {}

// Service
@Service @Transactional
public class ProductService {
  private final ProductRepository repo;
  public ProductService(ProductRepository repo) { this.repo = repo; }

  public ProductDto create(NewProduct cmd) {
    var saved = repo.save(new Product(cmd.name(), cmd.priceCents()));
    return new ProductDto(saved.getId(), saved.getName(), saved.getPriceCents());
  }
  // findById, update, delete ...
}

// Controller
@RestController @RequestMapping("/api/v1/products")
class ProductController {
  private final ProductService svc;
  // ... GET / POST / PUT / DELETE wired to svc
}

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