The user is not added to the database (Java, Mysql)?

Question

MySQL

I'm learning java. There was a problem, the user is not added to the database. There are no errors in the console.
Lesson
code:
DatebassHandler.java file

package sample;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
public class DatebassHandler extends Configs{
    Connection dbConnection;
    public Connection getDbConnection() throws ClassNotFoundException, SQLException {
        String connectionString = "jdbc:mysql://" + dbHost + ":" + dbPort + "/" + dbName +
                "?verifyServerCertificate=false"+
                "&useSSL=false"+
                "&requireSSL=false"+
                "&useLegacyDatetimeCode=false"+
                "&amp"+
                "&serverTimezone=UTC";
        Class.forName("com.mysql.cj.jdbc.Driver");
        dbConnection=DriverManager.getConnection(connectionString,dbUser,dbPass);
        return dbConnection;

    }
    public void signUpUser(User user){
        String insert = "INSERT INTO " + Const.USER_TABEL+"("+ Const.USER_LOGIN + ","+ Const.USER_CITY +","+ Const.USER_PASSWORD+ ","+
                Const.USER_GENDER+")"+ "VALUES(?,?,?,?)";
        try {
            PreparedStatement prSt = getDbConnection().prepareStatement(insert);
            prSt.setString(1, user.getLogin());
            prSt.setString(2, user.getCity());
            prSt.setString(3, user.getPassword());
            prSt.setString(4, user.getGender());
            prSt.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}

User.java:

package sample;

public class User {
    private String login;
    private String city;
    private String password;
    private String gender;

    public User(String login, String city, String password, String gender) {
        this.login = login;
        this.city = city;
        this.password = password;
        this.gender = gender;
    }

    public String getLogin() {
        return login;
    }

    public void setLogin(String login) {
        this.login = login;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }
}

SignUpController.java

package sample;

import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.CheckBox;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TextField;

public class SignUpController {

    @FXML
    private TextField login_field;

    @FXML
    private PasswordField password_field;

    @FXML
    private Button signUpButton;

    @FXML
    private TextField signUpCity;

    @FXML
    private CheckBox signUpCheckBoxMale;

    @FXML
    private CheckBox signUpCheckBoxFamale;

    @FXML
    void initialize(){
        signUpButton.setOnAction(event->{
        signUpNewuser();
        });
    }
    private void signUpNewuser() {
        DatebassHandler dbHandler = new DatebassHandler();
        String login = login_field.getText();
        String city = signUpCity.getText();
        String password = password_field.getText();
        String gender = "";
        if(signUpCheckBoxMale.isSelected())
            gender = "Male";
        else
            gender = "Female";
        User user = new User(login,city,password,gender);

        dbHandler.signUpUser(user);
    }
}