Caching Issue with Spring Boot REST API using Ehcache - Unexpected Behavior
I keep running into I've been struggling with this for a few days now and could really use some help. This might be a silly question, but I'm facing a frustrating issue with caching in my Spring Boot application. I'm using Ehcache (version 3.9.6) for caching responses from a REST API endpoint. I've followed the official Spring documentation to set up caching, but it seems that cached responses are not being returned as expected. Specifically, I have a method that fetches user details based on a user ID, and I want to cache the results for faster access. Here’s a simplified version of what I have: ```java @Service public class UserService { @Cacheable(value = "users", key = "#userId") public User getUserById(Long userId) { simulateSlowService(); // Simulates a slow service call return userRepository.findById(userId).orElse(null); } private void simulateSlowService() { try { Thread.sleep(3000); // Simulate delay } catch (InterruptedException e) { throw new IllegalStateException(e); } } } ``` And here’s how I have configured Ehcache in my application: ```xml <ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://www.ehcache.org/ehcache.xsd"> <cache name="users" maxEntriesLocalHeap="100" eternal="false" timeToIdleSeconds="3600" timeToLiveSeconds="86400" memoryStoreEvictionPolicy="LRU"/> </ehcache> ``` After calling `getUserById(1L)` for the first time, it takes around 3 seconds as expected. However, when I call `getUserById(1L)` again, it still takes around 3 seconds instead of returning the cached result. I've checked that the caching is properly configured and that the method is indeed being annotated with `@Cacheable`. I also verified that the `userId` is consistent across calls. My configuration class enabling caching looks like this: ```java @Configuration @EnableCaching public class CacheConfig { @Bean public CacheManager cacheManager() { return CacheManagerBuilder.newCacheManagerBuilder() .withCache("users", CacheConfigurationBuilder.newCacheConfiguration(Long.class, User.class, ResourcePoolsBuilder.heap(100))) .build(true); } } ``` Despite all this, I’m still seeing the slow response time. Are there any best practices or common pitfalls with Ehcache in Spring Boot that I might be missing? Also, are there any debug logs I can enable to gain more insight into what’s happening under the hood? Any help would be greatly appreciated! For context: I'm using Java on macOS. What am I doing wrong? I'd really appreciate any guidance on this. Is there a better approach?