Grails ehache invalidation not working - grails

Question

I am testing ehcache for grails. I am not able to invalidate my cache.
My test code:
The service method:
#Transactional
class HelpService {
#Cacheable('newcache')
def inlineCacheService(def param) {
println ("I am in the function")
MyTestClass a = new MyTestClass()
a.paramA = new Date()
a.paramB = [
id: "1",
data: "f"
]
return a
}
The code in the controller:
render "<br/>4: " + helpService.inlineCacheService("test").paramA
Thread.sleep(2000)
CacheManager cm = CacheManager.getInstance();
Cache myCache = cm.getCache("newcache")
myCache.removeAll()
render "<br/>4: " + helpService.inlineCacheService("test").paramA
I am getting a null pointer exception on remove all. Why the newcache can not be found? I am using this name in the cachable annotation and have it in my CacheConfig.groovy.
My CacheConfig.groovy:
config = {
cache {
name 'inlinecache'
//Overwrite these, inherit rest
timeToLiveSeconds 20
}
cache {
name 'newcache'
//Overwrite these, inherit rest
timeToLiveSeconds 30
}
defaultCache {
//Just inherit from defaults
}
defaults {
timeToIdleSeconds 120
timeToLiveSeconds 120
eternal false
overflowToDisk false
maxElementsInMemory 10000
maxElementsOnDisk 10000000
memoryStoreEvictionPolicy="LRU"
}
}
With this code it works:
CacheManager.ALL_CACHE_MANAGERS.each { cm ->
println (cm.getName())
String[] names = cm.getCacheNames();
for (String name : names)
{
Cache cache = cm.getCache(name);
println (name)
cache.removeAll();
}
};
But isn't there a better solution?
Best regards
Peter

Answer 1

I am not a Grails specialist, but what you have is most likely two CacheManager defined:
one by Grails - most likely a named one
then in your code snippet the CacheManager.getInstance() ends up creating the default un-named CacheManager that does not know anything about your configured cache.
So I would look up the Ehcache configuration you are specifying and I would update the code in your snippet to get to the same CacheManager.
Use CacheManager.getCacheManager(String name) to get to an existing CacheManager. If you pass null, it will get the CacheManager named with CacheManager.DEFAULT_NAME.