Ehcache is not being refreshed by cacheDecorator - spring

Question

I am using ehcache to refresh it from DB, but seems its not being refreshed.
ehcache.xml file ->
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="ehcache.xsd"
updateCheck="true"
monitoring="autodetect"
dynamicConfig="true">
<diskStore path="java.io.tmpdir"/>
<defaultCache
maxElementsInMemory="100"
eternal="false"
timeToIdleSeconds="120"
timeToLiveSeconds="120"
overflowToDisk="true"
diskSpoolBufferSizeMB="30"
maxElementsOnDisk="10000000"
diskPersistent="false"
diskExpiryThreadIntervalSeconds="120"
memoryStoreEvictionPolicy="LRU"/>
<!-- The cache configuration for our Currency cache -->
<cache name="cachename"
maxElementsInMemory="3000"
eternal="false"
timeToIdleSeconds="120"
timeToLiveSeconds="120"
overflowToDisk="true"
diskPersistent="false" >
<persistence strategy="localTempSwap" synchronousWrites="true" />
<cacheDecoratorFactory class="net.sf.ehcache.constructs.refreshahead.RefreshAheadCacheFactory"
properties="name=myCacheRefresher,
timeToRefreshSeconds=180,
batchSize=10,
numberOfThreads=4,
maximumBacklogItems=100,
evictOnLoadMiss=true" />
</cache>
</ehcache>
config.xml
<ehcache:annotation-driven cache-manager="ehcache" />
<bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager">
<property name="cacheManager" ref="ehcache" />
</bean>
<bean id="ehcache" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean" >
<property name="configLocation" value="ehcache.xml" />
</bean>
<bean id="cachingAttributeSource" class="org.springmodules.cache.annotations.AnnotationCachingAttributeSource" />
CatchFetch.java
#GET
#Path("/Mymethod")
#WebMethod(operationName = "mymethodforUI")
public List<Object> mymethodforUI() {
LOGGER.info("Getting mymethod.");
return dao.mymethod("keyname");
}
CacheDAO.java
#Cacheable(value = "cachename", key = "#key")
public List<Object> mymethod(String key) {
List<Object> res -> a slow query getting from Db
return res;
}
Question 1: The caching is working good for first 180 seconds, but after 180 seconds, the cache is supposed to refresh. That behaviour is not being reflected. Can someone figure out why ?
Question 2: Is there any way I can log the timestamps when the cache refresh occurs defined by cacheDecoratorFactory?

Answer 1

Can you confirm that you aren't getting UnsupportedOperationException stating that refresh-ahead not supported under transactions or with GAE?

Answer 2

In order to have refresh ahead working you need to have a cache loader defined. Otherwise, how do you expect the cache to know how to populate a mapping?
A setup without a loader should probably throw an exception as it will not work.