我正在尝试查询相同的数据。但是preparedStatement抛出了关于错误索引的SQLException，即使该索引从文档中说的1开始。

这是函数：

public List<Paper1> search(String keyword) throws NotConnectedException {

    List<Paper1> papers = new ArrayList<>();

    try {
        PreparedStatement searchKeyword = 
        connection.prepareStatement("SELECT title, registered FROM paper "
        + "WHERE title LIKE '%?%'");
        searchKeyword.setString(1, keyword);
        ResultSet rs = searchKeyword.executeQuery();

        while (rs.next()) {
            Paper1 p = new Paper1();
            p.setTitle(rs.getString("title"));
            p.setRegistered(rs.getDate("registered").toLocalDate());
            papers.add(p);
        }
        return papers;
    } catch (SQLException e) {
        e.printStackTrace();
        return null;
    }
}

SQLException表示，错误的行是

searchKeyword.setString(1, keyword);

由于列索引错误