return null;
Object o; try { Map map = retrieveAll(); o = map.remove(key); saveAll(map); } catch (CannotRetrieveException e) { throw new CannotRemoveException(e, "Unable to pre-load existing store."); } catch (CannotPersistException e) { throw new CannotRemoveException(e, "Unable to pre-load existing store."); } return (Serializable) o;
    public Serializable  remove(Serializable key) throws CannotRemoveException    {	return null;    }