[Opensymphony-oscache] NeedsRefreshException

Hi all
 
i'm implementing a cache manager to our application
i decided to try to work with OSCache but when i tried to getFromCache i get a NeedsRefreshException
although the object exists at the cache.
 
i'm using com.opensymphony.oscache.general.GeneralCacheAdministrator as the cache object
 
in the putInCache method i used the putInCache(String key, Object content, String[] groups)
in the getFromCache i used getFromCache(String key, int refreshPeriod, String cronExpiry)
when refreshPeriod=-1, cronExpiry= null.
in the configuration file i have only 3 properties define (all the other is OSCache defaults):         
                                                                                           cache.persistence.class=com.opensymphony.oscache.plugins.diskpersistence.DiskPersistenceListener, cache.capacity=1000
                                                                                           cache.path=<my path>
 
do you have any idea what is the problem??
what did i do wrong?
 
Thanks
    Tomer

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