Redis as cache provider in Spring Boot - Mini Project: Build & Apply

Redis as cache provider

📖 Scenario: You are building a Spring Boot application that fetches product details from a database. To improve performance, you want to use Redis as a cache provider so that repeated requests for the same product do not hit the database every time.

🎯 Goal: Build a Spring Boot application that uses Redis as a cache provider to store and retrieve product details efficiently.

📋 What You'll Learn

Create a simple Product class with id and name fields

Configure Redis cache manager in Spring Boot

Enable caching in the Spring Boot application

Use @Cacheable annotation on the method fetching product details

💡 Why This Matters

🌍 Real World

Caching with Redis is common in web applications to reduce database load and improve response times for frequently requested data.

💼 Career

Many backend developer roles require knowledge of caching strategies and integrating Redis with Spring Boot for scalable applications.

1

Create Product class

Create a Java record called Product with two fields: Long id and String name.

Spring Boot

// Your code here

Need a hint?

A record is a simple way to create immutable data classes in Java 17+. Use the record keyword.

2

Enable caching and configure Redis

In your Spring Boot main application class, add the @EnableCaching annotation above the class declaration. Also, create a RedisCacheManager bean method named cacheManager that returns a default RedisCacheManager using RedisCacheManager.create(redisConnectionFactory). Assume redisConnectionFactory is injected as a method parameter.

Spring Boot

public record Product(Long id, String name) {}

// Your code here

Need a hint?

Use @EnableCaching on the main class to activate caching. Define a @Bean method returning RedisCacheManager.create(redisConnectionFactory).

3

Create ProductService with caching

Create a Spring service class called ProductService with a method getProductById(Long id) that returns a Product. Annotate this method with @Cacheable("products"). Inside the method, return a new Product with the given id and name as "Product" + id.

Spring Boot

public record Product(Long id, String name) {}

// Your code here

Need a hint?

Use @Cacheable("products") on the method to enable caching. Return a new Product with the id and name "Product" + id.

4

Use ProductService in a REST controller

Create a REST controller class called ProductController with a GET mapping /products/{id}. Inject ProductService and in the handler method getProduct(Long id), return the result of productService.getProductById(id). Annotate the class with @RestController and the method with @GetMapping("/products/{id}").

Spring Boot

public record Product(Long id, String name) {}

// Your code here

Need a hint?

Create a REST controller with a GET endpoint that calls the cached service method to return product details.