[Opensymphony-oscache] problem with caching

1) 
To avoid a deadlock scenario to have to add the try-finally clause in the catch NeedsRefreshException block, see http://wiki.opensymphony.com/display/CACHE/API+Usage

2)
In generell you will get a NRE always, if you try to access a cache object which isn't in the cache yet. I think that you are getting the NRE with "cache.memory = true" too.

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