@Gary Hu, this appears to no longer be an issue – there's nothing to fix upstream. That Loader code now looks like:

		catch ( SQLException sqle ) {
			session.getTransactionCoordinator().getJdbcCoordinator().release( st );
			throw sqle;
		}
		catch ( HibernateException he ) {
			session.getTransactionCoordinator().getJdbcCoordinator().release( st );
			throw he;
		}

session.getTransactionCoordinator().getJdbcCoordinator().release( st ) does not throw a new exception – it catches, logs, and returns early. So, the re-thrown original Exception will still come through from Loader.