@Service annotation in Spring Boot - Mini Project: Build & Apply

Using the @Service Annotation in Spring Boot

📖 Scenario: You are building a simple Spring Boot application that manages a list of books. You want to separate the business logic from the controller by using a service class.

🎯 Goal: Create a service class annotated with @Service that provides a method to return a list of book titles.

📋 What You'll Learn

Create a class named BookService annotated with @Service.

Inside BookService, create a method getBookTitles() that returns a list of strings.

Initialize a list of book titles inside the service.

Use the service in a controller (not required to implement here, but keep the service ready).

💡 Why This Matters

🌍 Real World

In real applications, @Service classes hold business logic and data operations separate from controllers and repositories.

💼 Career

Understanding @Service is essential for building clean, maintainable Spring Boot applications and is a common requirement in Java backend developer roles.

1

Create the BookService class with a list of book titles

Create a class named BookService and inside it, create a private list of strings called bookTitles initialized with these exact values: "Spring Basics", "Java Fundamentals", "REST APIs".

Spring Boot

public class BookService {
    // Your code here
}

Need a hint?

Use Arrays.asList to create the list inside the class.

2

Add the @Service annotation to BookService

Add the @Service annotation above the BookService class declaration. Also, import org.springframework.stereotype.Service.

Spring Boot

import java.util.List;
import java.util.Arrays;

// Add @Service annotation here
public class BookService {
    private List bookTitles = Arrays.asList("Spring Basics", "Java Fundamentals", "REST APIs");
}

Need a hint?

The @Service annotation marks the class as a service component in Spring.

3

Create the getBookTitles() method

Inside the BookService class, create a public method named getBookTitles() that returns the bookTitles list.

Spring Boot

import java.util.List;
import java.util.Arrays;
import org.springframework.stereotype.Service;

@Service
public class BookService {
    private List bookTitles = Arrays.asList("Spring Basics", "Java Fundamentals", "REST APIs");

    // Create getBookTitles() method here
}

Need a hint?

The method should be public and return the list variable.

4

Complete the service class for Spring Boot use

Ensure the BookService class is public, annotated with @Service, and contains the bookTitles list and the getBookTitles() method as defined.

Spring Boot

import java.util.List;
import java.util.Arrays;
import org.springframework.stereotype.Service;

// Finalize the BookService class
public class BookService {
    private List bookTitles = Arrays.asList("Spring Basics", "Java Fundamentals", "REST APIs");

    public List getBookTitles() {
        return bookTitles;
    }
}

Need a hint?

Check that the class is annotated and all parts are present.