[Opensymphony-oscache] problem with caching

I can attach, but this is a standard code:
	        try
	        {
	            pc = (PostingCollection) cache.getFromCache(chid);
	        }
	        catch (NeedsRefreshException nre)
	        {
	            pf.Collect();
	            pc = pf.getPostings();
	            cache.putInCache(chid, pc, getChannelsGroups(pf.getChannels()));
	        }
where object cache is:
        GeneralCacheAdministrator admin = new GeneralCacheAdministrator();
        cache = admin.getCache();
cache is initialized once for application.

This works when i have cache.memory = true. When I have cache.memory = false i doesn't work

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