netbeans gui problem

[Trabajo]

Hi,

I wrote a program without GUI and now I'm trying to implement it in a GUI. I developed a GUI with the netbeans gui editor.

While implementing, i've got no errors but at runtime I get the following exception:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

I think it's because my objects aren't properly initialized. I don't know where to initialize them in the gui code of netbeans.

Here is a part of the main class:

public class frame_wysiwyg extends javax.swing.JFrame 
{
        /** Creates new form frame_wysiwyg */
    public frame_wysiwyg() 
    {
        initComponents();
     
    }
    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc=" Generated Code ">                          
    private void initComponents() {
        frameCreateEvent = new javax.swing.JFrame();
        wizardCreateEvent = new javax.swing.JPanel();
        jLabel12 = new javax.swing.JLabel();
        jLabel13 = new javax.swing.JLabel();
etc...

In this part I get the exception:

private void addConversationButtonActionPerformed(java.awt.event.ActionEvent evt) {                                                      
// TODO add your handling code here:
        vier = (int)((Integer.parseInt(valueIdOne.getText())));
        vijf = (int)((Integer.parseInt(valueIdTwo.getText())));
        gui_event.nieuwGesprek(vier,vijf); <--HERE I GET THE EXCEPTION
        int temp_aantal_gesprekken = (int)((Integer.parseInt(nrofconversations.getText())));
        temp_aantal_gesprekken++ ;
        nrofconversations.setText(Integer.toString(temp_aantal_gesprekken));
        frameAddConversation.dispose();
    }

and the main code where all parts of the gui are initialized

public static void main(String args[]) 
    {
       java.awt.EventQueue.invokeLater(new Runnable() 
       {
            public void run() 
            {
                new frame_wysiwyg().setVisible(true);
            }
       });

// Variables declaration - do not modify                     
    private javax.swing.JMenuBar MenuBar;
    private javax.swing.JButton addConversationButton;
    private javax.swing.JMenuItem addConversationMenuItem;
    ...
    ...
    }

I tried every position to initialize my objects from outside of the gui. Does someone know what I do wrong?
(The code without the gui is working properly so that's not the problem)

[ComputerJy]

NullPointerException:
Thrown when an application attempts to use null in a case where an object is required. These include:

* Calling the instance method of a null object.
* Accessing or modifying the field of a null object.
* Taking the length of null as if it were an array.
* Accessing or modifying the slots of null as if it were an array.
* Throwing null as if it were a Throwable value.

Applications should throw instances of this class to indicate other illegal uses of the null object.