Spring Boot使用JdbcTemplate的queryForList异常：Incorrect column count: expected 1, actual 3

org.springframework.jdbc.IncorrectResultSetColumnCountException: Incorrect column count: expected 1, actual 3

	at org.springframework.jdbc.core.SingleColumnRowMapper.mapRow(SingleColumnRowMapper.java:110)
	at org.springframework.jdbc.core.RowMapperResultSetExtractor.extractData(RowMapperResultSetExtractor.java:94)
	at org.springframework.jdbc.core.RowMapperResultSetExtractor.extractData(RowMapperResultSetExtractor.java:61)
	at org.springframework.jdbc.core.JdbcTemplate$1QueryStatementCallback.doInStatement(JdbcTemplate.java:440)
	at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:376)
	at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:452)
	at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:462)
	at org.springframework.jdbc.core.JdbcTemplate.queryForList(JdbcTemplate.java:485)
	at com.secbro.service.impl.OrderServiceImpl.findAll(OrderServiceImpl.java:50)
	at com.secbro.service.OrderServiceTest.findAll(OrderServiceTest.java:54)

@Override
	public List<Order> findAll() {
		return jdbcTemplate.queryForList("select * from tb_order", Order.class);
	}

/**
 * @param elementType the required type of element in the result list
 * (for example, {@code Integer.class})
 */
<T> List<T> queryForList(String sql, Class<T> elementType) throws DataAccessException;

jdbcTemplate.query("select * from tb_order", new OrderRowMapper());

class OrderRowMapper implements RowMapper<Order> {

	@Override
	public Order mapRow(ResultSet rs, int rowNum) throws SQLException {
		// 对数据的返回处理
		Order order = new Order();
		order.setId(rs.getInt("id"));
		order.setOrderNo(rs.getString("orderNo"));
		order.setAmount(rs.getInt("amount"));
		return order;
	}
}