Ehcache jsr107:defaults not applying to programmatically created caches - spring-boot

Question

Based on my findings in my previous SO question, I'm trying to setup JCaches in a mix of declarative and imperative configuration, to limit the max size of caches declaratively.
I keep a list of the caches and the duration (TTL) for their entries in my application.yaml, which I get with a property loader. I then create my caches with the code below:
#Bean
public List<javax.cache.Cache<Object, Object>> getCaches() {
javax.cache.CacheManager cacheManager = this.getCacheManager();
List<Cache<Object, Object>> caches = new ArrayList();
Map<String, String> cacheconfigs = //I populate this with a list of cache names and durations;
Set<String> keySet = cacheconfigs.keySet();
Iterator i$ = keySet.iterator();
while(i$.hasNext()) {
String key = (String)i$.next();
String durationMinutes = (String)cacheconfigs.get(key);
caches.add((new GenericDefaultCacheConfigurator.GenericDefaultCacheConfig(key, new Duration(TimeUnit.MINUTES, Long.valueOf(durationMinutes)))).getCache(cacheManager));
}
return caches;
}
#Bean
public CacheManager getCacheManager() {
return Caching.getCachingProvider().getCacheManager();
}
private class GenericDefaultCacheConfig {
public GenericDefaultCacheConfig(String cacheName, Duration duration) {
public GenericDefaultCacheConfig(String id, Duration duration, Factory expiryPolicyFactory) {
CACHE_ID = id;
DURATION = duration;
EXPIRY_POLICY = expiryPolicyFactory;
}
private MutableConfiguration<Object, Object> getCacheConfiguration() {
return new MutableConfiguration<Object, Object>()
.setTypes(Object.class, Object.class)
.setStoreByValue(true)
.setExpiryPolicyFactory(EXPIRY_POLICY);
}
public Cache<Object, Object> getCache(CacheManager cacheManager) {
CacheManager cm = cacheManager;
Cache<K, V> cache = cm.getCache(CACHE_ID, Object.class, Object.class);
if (cache == null)
cache = cm.createCache(CACHE_ID, getCacheConfiguration());
return cache;
}
}
I try limiting the cache size with the following ehcache.xml:
<config
xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
xmlns='http://www.ehcache.org/v3'
xmlns:jsr107='http://www.ehcache.org/v3/jsr107'
xsi:schemaLocation="
http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.0.xsd
http://www.ehcache.org/v3/jsr107 http://www.ehcache.org/schema/ehcache-107-ext-3.0.xsd">
<service>
<jsr107:defaults default-template="heap-cache" enable-management="true" enable-statistics="true">
</jsr107:defaults>
</service>
<cache-template name="heap-cache">
<resources>
<heap unit="entries">20</heap>
</resources>
</cache-template> </config>
I set the following declaration in my application.yaml:
spring:
cache:
jcache:
config: classpath:ehcache.xml
However, my caches don't honor the imposed limit. I validate with the following test:
#Test
public void testGetCacheMaxSize() {
Cache<Object, Object> cache = getCache(MY_CACHE); //I get a cache of type Eh107Cache[myCache]
CacheRuntimeConfiguration<Object, Object> ehcacheConfig = (CacheRuntimeConfiguration<Object, Object>)cache.getConfiguration(
Eh107Configuration.class).unwrap(CacheRuntimeConfiguration.class);
long size = ehcacheConfig.getResourcePools().getPoolForResource(ResourceType.Core.HEAP).getSize(); //Returns 9223372036854775807 instead of the expected 20
for(int i=0; i<30; i++)
commonDataService.getAllStates("ENTRY_"+i);
Map<Object, Object> cachedElements = cacheManagerService.getCachedElements(MY_CACHE);
assertTrue(cachedElements.size().equals(20)); //size() returns 30
}
Can somebody point out what I am doing wrong? Thanks in advance.

Answer 1

The issue comes from getting the cache manager as:
Caching.getCachingProvider().getCacheManager();
By setting the config file URI on cache manager's initialization I got it to work:
cachingProvider = Caching.getCachingProvider();
configFileURI = resourceLoader.getResource(configFilePath).getURI();
cacheManager = cachingProvider.getCacheManager(configFileURI, cachingProvider.getDefaultClassLoader());
I was under the expectation that Spring Boot would automatically create the cache manager based on the configuration file included given in property spring.cache.jcache.config,
but that was not the case because I get the cache manager as described above instead of simply auto-wiring it and letting Spring create it.