[Opensymphony-oscache] Performance of throwing NeedsRefreshException for missing keys

Hi,

I would like to ask if someone has already measured how expensive the NeedsRefreshExceptions are.
Throwing an exception is AFAIK pretty expensive (as the StackTrace has to be filled in), so I wonder if it is a good idea to throw an exception for every new and stale cache entry.

E.g. if your application has a very low refresh time, this could become a bottleneck, couldn't it?

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