Remove the cache entry corresponding to the specified key.
@param key the key of the entry to be removed.
@return the previous value associated with the given {@code key} or {@code null} if there was previous value
@throws CacheException if there is a problem accessing the underlying cache system
Remove the cache entry corresponding to the specified key.
@param key the key of the entry to be removed. @return the previous value associated with the given {@code key} or {@code null} if there was previous value @throws CacheException if there is a problem accessing the underlying cache system