Cache configuration in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to enable caching in a Spring Boot application.

Spring Boot

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.[1](Application.class, args);
    }
}

Drag options to blanks, or click blank then click option'

Arun

Bstart

Claunch

Dexecute

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'start' or 'launch' instead of 'run' causes errors.

Forgetting to call any method to start the app.

The SpringApplication.run() method starts the Spring Boot application.

2fill in blank

medium

Complete the annotation to enable caching in a Spring Boot application.

Spring Boot

@Configuration
@[1]
public class CacheConfig {
}

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AEnableCaching

BCacheable

CCacheConfig

DEnableCache

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Cacheable on configuration class instead of @EnableCaching.

Misspelling the annotation name.

The @EnableCaching annotation activates Spring's annotation-driven cache management capability.

3fill in blank

hard

Fix the error in the cacheable method annotation to cache the result.

Spring Boot

@Service
public class ProductService {

    @Cacheable(cacheNames = "products", key = "#[1]")
    public Product getProductById(Long id) {
        // fetch product
    }
}

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Akey

BproductId

Cid

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a key that does not match any parameter causes runtime errors.

Omitting the '#' in the SpEL expression.

The method parameter is named id, so the key expression must use #id to cache by that parameter.

4fill in blank

hard

Fill both blanks to configure a cache manager bean using ConcurrentMapCacheManager.

Spring Boot

@Configuration
public class CacheConfig {

    @Bean
    public CacheManager cacheManager() {
        return new [1](List.of("[2]"));
    }
}

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AConcurrentMapCacheManager

BRedisCacheManager

Cproducts

Dusers

Attempts:

3 left

💡 Hint

Common Mistakes

Using RedisCacheManager without Redis dependencies.

Mismatching cache names causes cache misses.

The ConcurrentMapCacheManager is a simple cache manager using a concurrent map. The cache name here is 'products'.

5fill in blank

hard

Fill all three blanks to create a cacheable method that caches by user ID and cache name 'users'.

Spring Boot

@Service
public class UserService {

    @Cacheable(cacheNames = "[1]", key = "#[2]")
    public User getUserById(Long [3]) {
        // fetch user
    }
}

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Ausers

Bid

CuserId

Dproducts

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for key and parameter causes cache failures.

Using wrong cache names leads to no caching.

The cache name is 'users'. The method parameter is named 'id', so the key expression uses '#id'. The parameter name in the method must match 'id'.