[Opensymphony-oscache] Urgent help required: Disk caching problem

I am ignoring the need for removeEntry now, just want to make first n objects in memory and extra ones in disk. I just can't make it happen no matter how I set the config value. I used Cache class then replaced it with GeneralCacheAdministrator class, my setting is as follows:

version 2.1, oscache-2.1.jar, (1/17/05)

cache.capacity=1
cache.unlimited.disk=false
cache.persistence.overflow.only=true
cache.persistence.class=com.opensymphony.oscache.plugins.diskpersistence.HashDiskPersistenceListener
cache.path=C:\\temp
cache.blocking=true
cache.memory=true

After I put 4 objects in cache, none appeared in my specified directory. 
However, I could make the disk-only cache work.

Please help!

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