Returns the Cached value stored under the specified {@code key} or
{@code null} if there is no Cache entry for that {@code key}.
@param key the key that the value was previous added with
@return the cached object or {@code null} if there is no entry for the specified {@code key}
@throws CacheException if there is a problem accessing the underlying cache system
Returns the Cached value stored under the specified {@code key} or {@code null} if there is no Cache entry for that {@code key}.
@param key the key that the value was previous added with @return the cached object or {@code null} if there is no entry for the specified {@code key} @throws CacheException if there is a problem accessing the underlying cache system