I'm trying to use caffeine cache on my springboot 3.1.4 application but it seems it doesn't work at all
The method is called every time and the cache it always empty
I have my cache configuration class
@Configuration
@EnableCaching
public class CacheConfig {
@Bean
public Caffeine<Object, Object> caffeineConfig() {
return Caffeine.newBuilder().expireAfterWrite(60, TimeUnit.MINUTES);
}
@Bean
public CacheManager cacheManager(Caffeine<Object, Object> caffeine) {
CaffeineCacheManager caffeineCacheManager = new CaffeineCacheManager();
caffeineCacheManager.setCaffeine(caffeine);
return caffeineCacheManager;
}
}
I have a cacheable method
public class Utils {
@Cacheable
public Integer test (Integer id) {
System.out.println("Not in cache : " + id);
return id + 2;
}
}
I'm trying to call it from a controller and print out cache content
@RestController
public class TestController {
@Autowired
CacheManager cacheManager;
@GetMapping("/test")
public void test() {
Utils utils = new Utils();
System.out.println(utils.test(3));
System.out.println(utils.test(3));
System.out.println(utils.test(4));
CaffeineCache caffeineCache = (CaffeineCache) cacheManager.getCache("JSON");
Cache<Object, Object> nativeCache = caffeineCache.getNativeCache();
for (Map.Entry<Object, Object> entry : nativeCache.asMap().entrySet()) {
System.out.println("Key = " + entry.getKey());
System.out.println("Value = " + entry.getValue());
}
}
}
Output :
Not in cache : 3
5
Not in cache : 3
5
Not in cache : 4
6
Do you have any idea of what I'm doing wrong ?
Spring Boot 101: anything is SpringBoot will only work when you autowire it (checkout proxy pattern to understand why). The second you use new - none of SpringBoot magic works (because Spring works via proxying your defined classes - Spring managed beans).
Solution: make Utils a Spring managed Component (give it a better name while you are at it):
@Service
public class Utils {
@Cacheable
public Integer test (Integer id) {
System.out.println("Not in cache : " + id);
return id + 2;
}
}
And then use it via @Autowired:
@RestController
public class TestController {
@Autowired
CacheManager cacheManager;
@Autowired
Utils utils;
@GetMapping("/test")
public void test() {
System.out.println(utils.test(3));
System.out.println(utils.test(3));
System.out.println(utils.test(4));
// ...