Cache configuration in Spring Boot - Mini Project: Build & Apply

Cache configuration

📖 Scenario: You are building a Spring Boot application that needs to cache user data to improve performance. Caching helps store data temporarily so the app can quickly access it without fetching it repeatedly from the database.

🎯 Goal: Create a simple cache configuration in Spring Boot to cache user information using the built-in caching support.

📋 What You'll Learn

Create a cache manager bean

Enable caching in the Spring Boot application

Use a cacheable method to store user data in the cache

Configure cache properties in the application

💡 Why This Matters

🌍 Real World

Caching is used in real applications to speed up data retrieval and reduce load on databases or external services.

💼 Career

Understanding cache configuration is important for backend developers working with Spring Boot to build efficient and scalable applications.

1

Enable caching in the Spring Boot application

Add the @EnableCaching annotation to the main application class called CacheApplication.

Spring Boot

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

// Add @EnableCaching annotation below
@SpringBootApplication
public class CacheApplication {
    public static void main(String[] args) {
        SpringApplication.run(CacheApplication.class, args);
    }
}

Need a hint?

The @EnableCaching annotation activates Spring's cache support.

2

Create a cache manager bean

In a new configuration class called CacheConfig, create a method cacheManager() that returns a ConcurrentMapCacheManager bean with cache name users.

Spring Boot

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.cache.concurrent.ConcurrentMapCacheManager;

@Configuration
public class CacheConfig {
    // Create cacheManager bean here
    // Your code here
}

Need a hint?

The ConcurrentMapCacheManager manages caches stored in memory using a concurrent map.

3

Add a cacheable method to store user data

Create a service class called UserService with a method getUserById that takes a Long id parameter and returns a String. Annotate this method with @Cacheable("users") and return a string like "User" + id.

Spring Boot

import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

@Service
public class UserService {
    // Add cacheable method getUserById here
    // Your code here
}

Need a hint?

The @Cacheable annotation tells Spring to cache the result of this method using the cache named "users".

4

Configure cache properties in application.properties

Add the line spring.cache.cache-names=users to the application.properties file to declare the cache name.

Spring Boot

# Add cache name configuration below
# Your code here

Need a hint?

This property tells Spring Boot which cache names to recognize and manage.