class UserDaoImpl implements UserDao {

    public final JdbcTemplate jdbcTemplate;

    @Transactional
    @Override
    public void update() {<FILL_FUNCTION_BODY>}

}

        jdbcTemplate.execute("update t_user set username = 'Petty' where id = 1");
        jdbcTemplate.execute("update t_user set username = 'Yoga' where id = 2");
        throw new RuntimeException("test exception");
    
<no_super_class>