Help on cache mechanism when multiple classes sharing the same table

[Ha...@Countrywide.Com]

Hi,
I have several classname, sharing the same table in the databse. For 
example,

com.bp.accounting.user
com.bp.market.user

These two classes are using the same table S_USER in the database, using 
two classes instead of one is for the purpose of maintaince and 
performance.

If I have updated an object with class "accounting.user", I have to clear 
the cache of class "market.user", othwise then people retrieve 
"market.user" from cache, it will get wrong data.

What kind of cache mechanism should I use?

Thanks
Hanmin