The program can't find Connector J

Question

I want to connect to my DB, but always get an exeption: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

I've installed Connector J as a library on NetBeans: enter image description here

Here is the code in main:

import java.sql.SQLException;

public class Mavenproject2 {

    public static void main(String[] args) throws SQLException, ClassNotFoundException {
        
        try{
             Class.forName("com.mysql.jdbc.Driver").getDeclaredConstructor().newInstance();
             System.out.println("Connection succesfull!");
         }
         catch(Exception ex){
             System.out.println("Connection failed...");
              
             System.out.println(ex);
         }
        
        //DBHandler dbh = new DBHandler();
        //dbh.signUser("Andrei", "Ker", "test", "123456789");
    }
}

I always get "Connection failed...".

I deleted Class.forName as I was advised and lounched the main code, but got the new exeption: Exception in thread "main" java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/test_schema

But I could connect to this DB in NetBeans and see all its columns and rows. So if driver is preinstaled, what cause the exeption?

import java.sql.Connection;
import java.sql.DriverAction;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class DBHandler extends Configs {

    Connection dbCon;

    public Connection getDbConnection() throws ClassNotFoundException, SQLException {
        String connectionString = "jdbc:mysql://" + dbHost + ":"
                + Port + "/" + Name;
        //Class.forName("com.mysql.cj.jdbc.Driver");

        dbCon = DriverManager.getConnection(connectionString, User, Pass);
        return dbCon;
    }

    public void signUser(String name, String surename, String login, String pass) throws SQLException, ClassNotFoundException {
        String insert = "INSERT INTO " + Const.USER_TABLE + "(" + Const.USER_FIRSTNAME+")"+"VALUES(?)";
        PreparedStatement ps = getDbConnection().prepareStatement(insert);
        ps.setString(1, name);
        ps.executeUpdate();
    }
}