java连接数据库，能显示结果但是出现关闭不了的错误

package shuji;
import java.sql.*;
public class Date {

public static void main(String[] args) {
    // TODO Auto-generated method stub
    Connection conn=null;
    Statement stmt=null;
    String DB_URL="jdbc:mysql://localhost:3306/student";
    String user="root";
    String pass="******";
    try {
        Class.forName("com.mysql.cj.jdbc.Driver");
        conn = DriverManager.getConnection(DB_URL, user, pass);           
        stmt = conn.createStatement();
        String sql = "SELECT * FROM student";
        ResultSet rs = stmt.executeQuery(sql);//(4)
        while (rs.next()) {
            int id = rs.getInt("ID");
            String name = rs.getString("Name");
            String sex = rs.getString("Sex");
            String address = rs.getString("Address");
            System.out.print("ID: " + id);
            System.out.print(", 姓名: " + name);
            System.out.print(", 性别: " + sex);
            System.out.print(", 地址: " + address);
            System.out.print("\n");
        }
        rs.close();
        stmt.close();
        conn.close();
    } catch (Exception e) {
        System.out.print(e);
    }
}

}

在链接最后面添加&useSSL=false

参考：https://blog.csdn.net/qq_44096670/article/details/129566356

 String DB_URL="jdbc:mysql://localhost:3306/student?useSSL=false";