Multiple classes error

Hi,

I have a class made to vote on a form i have on my website and the code works as is. I am trying to break the methods down into different classes so that i can work on the code easier. When i run the new class that calls methods from other classes i get a "Exception in thread "main" java.lang.NullPointerException" error in the console. The error occurs whenever i try up update a JLabel in any of my new classes. here is how my current project is set up with the first set of bullets being the packages:

• back_end
  
  • randomuser.java
  • timer_functions.java
  • tor_connect.java
  • variables.java
  • vote.java
• bot
  
  • start_gui_bot.java
• GUI_components
  
  • label_set.java

And here is the code for the main class (start_gui_bot.java):

Code:

---

package bot;

import javax.swing.JFrame;
import javax.swing.JPanel;

import back_end.timer_functions;
import back_end.tor_connect;
import back_end.variables;
import back_end.vote;
import GUI_components.label_set;

public class start_gui_bot extends JFrame{
       
        variables call_vars = new variables();
       
        public start_gui_bot (String url) throws Exception {

                variables.bUrl = url;
                call_vars.timeRemaining = variables.timertime;
               
                setDefaultCloseOperation(EXIT_ON_CLOSE);
            setSize(480, 250);
           
            call_vars.panel = new JPanel();
           
            call_vars.panel.setLayout(null);
           
        }

public static void main(String[] args) throws Exception {
       
        start_gui_bot vb = new start_gui_bot (variables.form_url);
        variables call_vars = new variables();
        label_set ls = new label_set();
        tor_connect tc = new tor_connect();
        vote cv = new vote();
        timer_functions tf = new timer_functions();
               
                ls.add_labels();
                if ( variables.set_tor == "true" ) {
                        tc.setTor();
                }
                for (int i = 1; i <= variables.make_vote_number; i++){
                        cv.vote ();
                        tf.start();
                        tf.stop();
                        tf.reset();
                }
                call_vars.label.setText("Done!");
            }
        }

---

the error is thrown at ls.add_labels(); so here is its code:

Code:

---

package GUI_components;

import javax.swing.JFrame;
import javax.swing.JLabel;
import back_end.variables;

@SuppressWarnings("serial")
public class label_set extends JFrame{
       
        variables call_vars = new variables();
       
       
        public void add_labels(){
               
            call_vars.timerheadinglabel = new JLabel("Time till next vote:");
            call_vars.votecountlabel = new JLabel("Waiting");
            call_vars.label = new JLabel("Waiting");
            call_vars.iplabel = new JLabel("Waiting");
            call_vars.userlabel = new JLabel("Waiting");
            call_vars.lastvoteinfolabel = new JLabel("Last Vote Info");
            call_vars.totaltallylabel = new JLabel("Total Tally");

            call_vars.timerheadinglabel.setBounds(175, 47, 150, 14);
            call_vars.label.setBounds(214, 70, 60, 14);
            call_vars.iplabel.setBounds(90, 125, 150, 14);
            call_vars.userlabel.setBounds(90, 150, 120, 14);
            call_vars.votecountlabel.setBounds(250, 125, 100, 20);
            call_vars.lastvoteinfolabel.setBounds(95, 100, 100, 14);
            call_vars.totaltallylabel.setBounds(250, 100, 100, 14);
               
            call_vars.panel.add(call_vars.label);
            call_vars.panel.add(call_vars.timerheadinglabel);
            call_vars.panel.add(call_vars.userlabel);
            call_vars.panel.add(call_vars.iplabel);
            call_vars.panel.add(call_vars.votecountlabel);
            call_vars.panel.add(call_vars.lastvoteinfolabel);
            call_vars.panel.add(call_vars.totaltallylabel);

            add(call_vars.panel);
            setVisible(true);
        }
}

---

here the error is thrown at call_vars.panel.add(call_vars.label); I understand the the call_cars.label is empty and they is why i am getting the error, what i dont know is how i can go about fixing it. Thanks for any help you guys can give!

Nat