Writing clean and maintainable code is essential in any Java application, especially in microservices where modularity and simplicity matter most. The Lombok library is a powerful tool that helps Java developers reduce boilerplate code by automatically generating commonly used methods like getters, setters, constructors, and more. In this article, we’ll walk through how to build a simple Spring Boot microservice using Lombok to make your code more concise and readable — all while keeping things clean and production-ready.

Technologies Used:

• Spring Boot (REST)
• Lombok
• Maven
• Java 17+
• In-memory List for simplicity (no database)

1. Project Structure

src/
└── main/
    └── java/
        └── com/example/bookservice/
            ├── BookServiceApplication.java
            ├── controller/
            │   └── BookController.java
            ├── model/
            │   └── Book.java
            └── service/
                └── BookService.java

2. Book.java (Model Layer)

package com.example.bookservice.model;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Book {
    private String id;
    private String title;
    private String author;
}

What’s happening here?

• @Data: generates getters, setters, toString(), equals(), and hashCode().
• @NoArgsConstructor and @AllArgsConstructor: handle constructors.

3. BookService.java (Service Layer)

package com.example.bookservice.service;

import com.example.bookservice.model.Book;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;

@Service
public class BookService {

    private final List<Book> bookRepo = new ArrayList<>();

    public List<Book> getAllBooks() {
        return bookRepo;
    }

    public Book addBook(Book book) {
        bookRepo.add(book);
        return book;
    }
}

4. BookController.java (Controller Layer)

package com.example.bookservice.controller;

import com.example.bookservice.model.Book;
import com.example.bookservice.service.BookService;
import lombok.RequiredArgsConstructor;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
@RequestMapping("/api/books")
@RequiredArgsConstructor
public class BookController {

    private final BookService bookService;

    @GetMapping
    public List<Book> getBooks() {
        return bookService.getAllBooks();
    }

    @PostMapping
    public Book createBook(@RequestBody Book book) {
        return bookService.addBook(book);
    }
}

Explanation:

• @RestController: simplifies REST API creation.
• @RequiredArgsConstructor: auto-generates a constructor for final fields (like bookService).

5. Main Class

package com.example.bookservice;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class BookServiceApplication {
    public static void main(String[] args) {
        SpringApplication.run(BookServiceApplication.class, args);
    }
}

Test with Curl or Postman

GET all books

curl http://localhost:8080/api/books

POST new book