private void startOperation() {
session = PersistenceUtility.openSession();
transaction = session.beginTransaction();
}
public void finishOperation() {
PersistenceUtility.close(session);
}
private void handleException(HibernateException e) throws DataAccessLayerException {
e.printStackTrace();
PersistenceUtility.rollback(transaction);
throw new DataAccessLayerException(e);
}
public EntityManager() {
PersistenceUtility.buildIfNeeded();
}