Develop Reference

Why can't I return true? am I making a mistake in the database query part?

I have tried all kinds of combinations since morning but I can't return any true value. The information I entered is completely correct.
Help me pls why can't I return true? am I making a mistake in the database query part?
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.Statement;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JOptionPane;
import java.sql.ResultSet;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* #author seyme
*/
public class para_ekle extends javax.swing.JFrame {
private boolean ahmet;
/**
* Creates new form para_ekle
*/
public para_ekle() {
initComponents();
}
static boolean ekle = false;
public void kontrol() throws SQLException{
Connection connect = null;
dbbaglanti db = new dbbaglanti();
connect = db.getConnection();
Statement oku = ( Statement) connect.createStatement();
String cekilenid = idtext4.getText();
int cevrilenid = Integer.parseInt(cekilenid);
String sifrebilgisi = sifretext4.getText();
String tutarbilgisi = idtext4.getText();
int cevrilentutar = Integer.parseInt(tutarbilgisi);
try {
}catch(Exception e){
JOptionPane.showMessageDialog(null, "Bilgilerde Bir Hata Bulunuyor!");
}
ResultSet rs;
rs = oku.executeQuery("SELECT count(id) as \"giris\" FROM dbkullanici.kullanicilar WHERE id ="+ cevrilenid +" && sifre = '"+sifrebilgisi+"'" +";");
while (rs.next()) {
int id = rs.getInt("giris");
if(id == 1){ boolean ahmet = ekle == true; } else if (id == 0 ){boolean ahmet = ekle == false;}
}
if(ahmet == true){
erortext.setText("verilerdogru");
}else if(ahmet == false){
erortext.setText("Bilgileriniz Veritabanımızda ki veriler ile eşleşmedi");
}
}
/**
* 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.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel5 = new javax.swing.JLabel();
jLabel6 = new javax.swing.JLabel();
idtext4 = new javax.swing.JTextField();
sifretext4 = new javax.swing.JTextField();
jLabel7 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
jLabel3 = new javax.swing.JLabel();
tutartext = new javax.swing.JTextField();
erortext = new javax.swing.JLabel();
jButton2 = new javax.swing.JButton();
jLabel4 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setFont(new java.awt.Font("Segoe UI Black", 1, 36)); // NOI18N
jLabel1.setText("ISSEY FİNANS SİSTEMİ");
jLabel2.setFont(new java.awt.Font("Ink Free", 1, 14)); // NOI18N
jLabel2.setText("ISSEY ile paralarınız daha değerli");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap(37, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 428, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(32, 32, 32))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 214, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(128, 128, 128))))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(22, 22, 22)
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 18, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
jLabel5.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel5.setText("Hesap Şifreniz: ");
jLabel6.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel6.setText("Hesap İd Numaranızı Yazınız: ");
idtext4.setText("jTextField1");
sifretext4.setText("jTextField2");
jLabel7.setText("İd Numaranızı Bilmiyorsanız Kullanıcı listeleme panelinden görüntüleyebilirsiniz.");
jButton1.setText("Ana Menü'ye Dön");
jLabel3.setFont(new java.awt.Font("Tahoma", 0, 12)); // NOI18N
jLabel3.setText("Eklemek İstediğiniz Tutar");
tutartext.setText("jTextField1");
erortext.setForeground(new java.awt.Color(255, 0, 0));
jButton2.setText("Para Ekle");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
jLabel4.setForeground(new java.awt.Color(102, 102, 102));
jLabel4.setText(" Para Eklemi işlemi için tüm bilgileri büyük küçük harf ve boşluk dahil doğru girmelisiniz.");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(erortext, javax.swing.GroupLayout.PREFERRED_SIZE, 390, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(55, 55, 55))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(0, 0, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel7)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jLabel6, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, 188, javax.swing.GroupLayout.PREFERRED_SIZE))
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 142, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(26, 26, 26)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(idtext4)
.addComponent(sifretext4)
.addComponent(tutartext, javax.swing.GroupLayout.PREFERRED_SIZE, 124, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(layout.createSequentialGroup()
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 119, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 118, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(8, 8, 8)))
.addGap(61, 61, 61))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 408, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(23, 23, 23))))))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel7)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, 34, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(idtext4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(sifretext4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3)
.addComponent(tutartext, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jLabel4)
.addGap(16, 16, 16)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(erortext, javax.swing.GroupLayout.DEFAULT_SIZE, 50, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
try {
kontrol();
} catch (SQLException ex) {
Logger.getLogger(para_ekle.class.getName()).log(Level.SEVERE, null, ex);
}
}
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(para_ekle.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(para_ekle.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(para_ekle.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(para_ekle.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new para_ekle().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel erortext;
private javax.swing.JTextField idtext4;
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel6;
private javax.swing.JLabel jLabel7;
private javax.swing.JPanel jPanel1;
private javax.swing.JTextField sifretext4;
private javax.swing.JTextField tutartext;
// End of variables declaration
}

Multiple errors generated by netbeans auto-code when inserting jButton event through GUI

I've made a jFrame and jPanel with many buttons with the Netbeans assistant.
After hours of work, in a perfectly working code, each time I try to insert a new event, the code generated by the assistant produces hundreds of errors all around the class.
Anyone have experienced this issue?
Anyone got a fix?
Thanks.
The generated code:
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package prog08notes;
/**
*
* #author Diego
*/
public class VentanaMenu extends javax.swing.JFrame {
String action = "";
String historic = "";
/**
* Creates new form VentanaMenu
*/
public VentanaMenu() {
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.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPopupMenu1 = new javax.swing.JPopupMenu();
jMenu1 = new javax.swing.JMenu();
jMenu2 = new javax.swing.JMenu();
popupMenu1 = new java.awt.PopupMenu();
jMenu3 = new javax.swing.JMenu();
jMenu4 = new javax.swing.JMenu();
jPopupMenu2 = new javax.swing.JPopupMenu();
jPanel1 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
jButton4 = new javax.swing.JButton();
jButton5 = new javax.swing.JButton();
jButton6 = new javax.swing.JButton();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jLabel5 = new javax.swing.JLabel();
jLabel6 = new javax.swing.JLabel();
jLabel7 = new javax.swing.JLabel();
codAl = new javax.swing.JTextField();
inXAR = new javax.swing.JTextField();
inWEB = new javax.swing.JTextField();
inMSO = new javax.swing.JTextField();
inPROG = new javax.swing.JTextField();
jScrollPane1 = new javax.swing.JScrollPane();
output = new javax.swing.JTextArea();
jLabel8 = new javax.swing.JLabel();
jLabel9 = new javax.swing.JLabel();
jLabel10 = new javax.swing.JLabel();
jLabel11 = new javax.swing.JLabel();
jLabel12 = new javax.swing.JLabel();
introAs = new javax.swing.JComboBox<>();
jComboBox2 = new javax.swing.JComboBox<>();
jLabel13 = new javax.swing.JLabel();
jScrollPane2 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
jMenu1.setText("jMenu1");
jMenu2.setText("jMenu2");
popupMenu1.setLabel("popupMenu1");
jMenu3.setText("jMenu3");
jMenu4.setText("jMenu4");
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setLocationByPlatform(true);
jLabel1.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
jLabel1.setText("Menú de opciones");
jButton1.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jButton1.setText("1");
jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jButton1MouseClicked(evt);
}
});
jButton2.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jButton2.setText("0");
jButton3.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jButton3.setText("2");
jButton3.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jButton3MouseClicked(evt);
}
});
jButton4.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jButton4.setText("3");
jButton4.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jButton4MouseClicked(evt);
}
});
jButton5.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jButton5.setText("4");
jButton6.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jButton6.setText("5");
jLabel2.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel2.setText("Introducir en la lista de alumnos");
jLabel3.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel3.setText("Visualizar la nota media del módulo");
jLabel4.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel4.setText("Visualizar medias de todos los alumnos");
jLabel5.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel5.setText("Salir");
jLabel6.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel6.setText("Visualizar nota determinada del alumno");
jLabel7.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel7.setText("Informe global del curso");
output.setEditable(false);
output.setColumns(20);
output.setRows(5);
jScrollPane1.setViewportView(output);
jLabel8.setText("COD AL");
jLabel9.setText("SiPROG");
jLabel10.setText("SiMSO");
jLabel11.setText("SiWEB");
jLabel12.setText("SiXAR");
introAs.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "SiPROG", "SiMSO", "SiWEB", "SiXAR" }));
introAs.addItemListener(new java.awt.event.ItemListener() {
public void itemStateChanged(java.awt.event.ItemEvent evt) {
introAsItemStateChanged(evt);
}
});
introAs.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
introAsActionPerformed(evt);
}
});
jComboBox2.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
jComboBox2.addItemListener(new java.awt.event.ItemListener() {
public void itemStateChanged(java.awt.event.ItemEvent evt) {
jComboBox2ItemStateChanged(evt);
}
});
jLabel13.setText("SALIDA");
jTextArea1.setEditable(false);
jTextArea1.setBackground(getBackground());
jTextArea1.setColumns(20);
jTextArea1.setRows(5);
jTextArea1.setText("INSTRUCCIONES:\nIntroducir los datos (si se requieren) en las casillas \no menús correspondientes.\nPulsar el botón del menú deseado.\nLos datos se mostrarán en la ventana inferior.");
jTextArea1.setBorder(null);
jScrollPane2.setViewportView(jTextArea1);
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 163, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jButton2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, 256, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(0, 0, Short.MAX_VALUE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jScrollPane1, javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel1Layout.createSequentialGroup()
.addComponent(jButton4)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 242, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel1Layout.createSequentialGroup()
.addComponent(jButton1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 242, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel1Layout.createSequentialGroup()
.addComponent(jButton3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 242, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(35, 35, 35)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(2, 2, 2)
.addComponent(jLabel8)
.addGap(47, 47, 47)
.addComponent(jLabel9)
.addGap(44, 44, 44)
.addComponent(jLabel10)
.addGap(58, 58, 58)
.addComponent(jLabel11)
.addGap(54, 54, 54)
.addComponent(jLabel12))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(codAl, javax.swing.GroupLayout.PREFERRED_SIZE, 74, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(inPROG, javax.swing.GroupLayout.PREFERRED_SIZE, 74, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(inMSO, javax.swing.GroupLayout.PREFERRED_SIZE, 74, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(14, 14, 14)
.addComponent(inWEB, javax.swing.GroupLayout.PREFERRED_SIZE, 74, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(inXAR, javax.swing.GroupLayout.PREFERRED_SIZE, 74, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(introAs, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGap(312, 312, 312)))))
.addGap(0, 0, Short.MAX_VALUE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jButton5)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel7, javax.swing.GroupLayout.PREFERRED_SIZE, 242, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jButton6)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, 242, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(35, 35, 35)
.addComponent(jComboBox2, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
.addGap(18, 18, 18)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 294, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap())))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(18, 18, 18)
.addComponent(jLabel13, javax.swing.GroupLayout.PREFERRED_SIZE, 75, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 0, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(20, 20, 20)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel8)
.addComponent(jLabel9)
.addComponent(jLabel10)
.addComponent(jLabel11)
.addComponent(jLabel12))
.addGap(10, 10, 10)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jLabel2, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jButton3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(inXAR, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(inWEB, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(inMSO, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(inPROG, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(codAl, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton4, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(introAs, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton5)
.addComponent(jLabel7, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton6)
.addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jComboBox2, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addComponent(jScrollPane2))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton2)
.addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(37, 37, 37)
.addComponent(jLabel13, javax.swing.GroupLayout.PREFERRED_SIZE, 22, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 306, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void introAsActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jComboBox2ItemStateChanged(java.awt.event.ItemEvent evt) {
// TODO add your handling code here:
}
private void introAsItemStateChanged(java.awt.event.ItemEvent evt) {
String asignatura = (String) introAs.getSelectedItem();
if (asignatura.equals("SiPROG")) {cod = 1; };
if (asignatura.equals("SiMSO")) {cod = 2; };
if (asignatura.equals("SiWEB")) {cod = 3; };
if (asignatura.equals("SiXAR")) {cod = 4; };
}
private void jButton4MouseClicked(java.awt.event.MouseEvent evt) {
float media = pn.mitjanaModul(cod);
writeConsole("La nota media del módulo " + introAs.getSelectedItem()+ " es " + media + ".");
}
private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {
//Creación de alumno
boolean check = true;
if (Alumno.validaCodi(codAl.getText())) {
try{
float f1 = Float.parseFloat(inPROG.getText());
if (!(0 <= f1 && 10 >= f1)) {check =false;};
float f2 = Float.parseFloat(inMSO.getText());
if (!(0 <= f2 && 10 >= f2)) {check =false;};
float f3 = Float.parseFloat(inWEB.getText());
if (!(0 <= f3 && 10 >= f3)) {check =false;};
float f4 = Float.parseFloat(inXAR.getText());
if (!(0 <= f4 && 10 >= f4)) {check =false;};
if (check) {
float grades []= {f1,f2,f3,f4};
pn.inserirAlumne(codAl.getText(), grades);
writeConsole("Insertado el alumno " + codAl.getText());
}
private void jButton3MouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
}
else { writeConsole("Las notas deben estar entre 0 y 10.");};}
catch (Exception ex) {
writeConsole("Debes rellenar correctamente los campos del alumno.");
}}
else writeConsole("El código de alumno está formado por 3 mayúsculas y 2 dígitos.");
}
//Método de escritura en la consola
public void writeConsole (String s){
action = s;
historic = historic + "\n" + action;
output.setText(historic);
}
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(VentanaMenu.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(VentanaMenu.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(VentanaMenu.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(VentanaMenu.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
//</editor-fold>
//</editor-fold>
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new VentanaMenu().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTextField codAl;
private javax.swing.JTextField inMSO;
private javax.swing.JTextField inPROG;
private javax.swing.JTextField inWEB;
private javax.swing.JTextField inXAR;
private javax.swing.JComboBox<String> introAs;
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JButton jButton4;
private javax.swing.JButton jButton5;
private javax.swing.JButton jButton6;
private javax.swing.JComboBox<String> jComboBox2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel10;
private javax.swing.JLabel jLabel11;
private javax.swing.JLabel jLabel12;
private javax.swing.JLabel jLabel13;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel6;
private javax.swing.JLabel jLabel7;
private javax.swing.JLabel jLabel8;
private javax.swing.JLabel jLabel9;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenu jMenu2;
private javax.swing.JMenu jMenu3;
private javax.swing.JMenu jMenu4;
private javax.swing.JPanel jPanel1;
private javax.swing.JPopupMenu jPopupMenu1;
private javax.swing.JPopupMenu jPopupMenu2;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTextArea jTextArea1;
private javax.swing.JTextArea output;
private java.awt.PopupMenu popupMenu1;
// End of variables declaration
//Variables propias
Prog08Notes pn = new Prog08Notes();
byte cod = 1;
}

JFrame not printing properly

I am making a movie ticket management system. And for that, I want to generate a PDF. But the PDF is not making properly. When I set the visibility of my jframe true, I see that my jframe is updated properly. But when i generate PDF from that , it does not show me the updated value. It show me the default value in my PDF. How can I solve this?
Here I cannot show you all my code because of the limit of words in a post. In UserHistoryPanel.java, I want that when I pressed jButton1, PrintTicket jframe should be printed.
Here is my code:
UserHistoryPanel.java
package paneles;
import cambodia.raven.DateChooser;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
public class UserHistoryPanel extends javax.swing.JPanel {
String UserName, theatreName, theatreAddress;
Integer UserId;
/**
* Creates new form UserHistoryPanel
*/
public UserHistoryPanel() {
initComponents();
}
public UserHistoryPanel(String userName) {
initComponents();
UserName = userName;
DefaultTableModel model = (DefaultTableModel)HistoryTable.getModel();
model.setRowCount(0);
show_history();
jTextField1.setText("");
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
int i = HistoryTable.getSelectedRow();
TableModel model = HistoryTable.getModel();
String OrderId = model.getValueAt(i, 0).toString();
String movieName = model.getValueAt(i, 3).toString();
theatreName = model.getValueAt(i, 4).toString();
String hall = model.getValueAt(i, 5).toString();
String date = model.getValueAt(i, 1).toString();
String time = model.getValueAt(i, 2).toString();
find_theatreDeatils();
new PrintTicket(OrderId,UserName, movieName, theatreName, hall, theatreAddress, date, time).setVisible(true);
PrinterJob job = PrinterJob.getPrinterJob();
job.setJobName("Cineplex Management System");
job.setPrintable(new Printable(){
public int print(Graphics pg,PageFormat pf, int pageNum){
pf.setOrientation(PageFormat.LANDSCAPE);
if(pageNum>0){
return Printable.NO_SUCH_PAGE;
}
Graphics2D g2 = (Graphics2D)pg;
g2.translate(pf.getImageableX(), pf.getImageableY());
g2.scale(1,1.1);
JPanel jPanel1 = new PrintTicket().getjPanel1();
jPanel1.paint(g2);
return Printable.PAGE_EXISTS;
}
});
boolean ok = job.printDialog();
if(ok){
try{
job.print();
}
catch (PrinterException ex){
}
}
}
// Variables declaration - do not modify
private javax.swing.JTable HistoryTable;
private cambodia.raven.DateChooser dateChooser1;
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton3;
private javax.swing.JButton jButton5;
private javax.swing.JButton jButton6;
private javax.swing.JLabel jLabel7;
private javax.swing.JPanel jPanel2;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JSeparator jSeparator3;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}
PrintTicket.java
package paneles;
import javax.swing.JPanel;
public class PrintTicket extends javax.swing.JFrame {
/**
* Creates new form PrintTicket
*/
public PrintTicket() {
initComponents();
}
public PrintTicket(String OrderId,String UserName, String Movie, String Theatre, String Hall, String TheatreAddress, String Date, String Time) {
initComponents();
orderId.setText(OrderId);
userName.setText(UserName);
movie.setText(Movie);
theatre.setText(Theatre);
hall.setText(Hall);
theatreAddress.setText(TheatreAddress);
date.setText(Date);
time.setText(Time);
}
public JPanel getjPanel1() {
return jPanel1;
}
public void setjPanel1(JPanel jPanel1) {
this.jPanel1 = jPanel1;
}
/**
* 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.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jLabel5 = new javax.swing.JLabel();
jLabel6 = new javax.swing.JLabel();
jLabel7 = new javax.swing.JLabel();
jLabel8 = new javax.swing.JLabel();
jLabel9 = new javax.swing.JLabel();
jLabel10 = new javax.swing.JLabel();
jLabel11 = new javax.swing.JLabel();
date = new javax.swing.JLabel();
orderId = new javax.swing.JLabel();
userName = new javax.swing.JLabel();
movie = new javax.swing.JLabel();
theatre = new javax.swing.JLabel();
hall = new javax.swing.JLabel();
theatreAddress = new javax.swing.JLabel();
time = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setMinimumSize(new java.awt.Dimension(654, 723));
getContentPane().setLayout(null);
jLabel2.setFont(new java.awt.Font("Tahoma", 1, 24)); // NOI18N
jLabel2.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
jLabel2.setText("Ticket and Invoice");
jLabel3.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
jLabel3.setText("Order Id:");
jLabel4.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
jLabel4.setText("Username:");
jLabel5.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
jLabel5.setText("Movie:");
jLabel6.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
jLabel6.setText("Theatre:");
jLabel7.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
jLabel7.setText("Hall:");
jLabel8.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
jLabel8.setText("Theatre Address:");
jLabel9.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
jLabel9.setText("Date:");
jLabel10.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
jLabel10.setText("Time:");
jLabel11.setFont(new java.awt.Font("Tahoma", 1, 36)); // NOI18N
jLabel11.setText("Cineplex Mangement System");
date.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
orderId.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
userName.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
movie.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
theatre.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
hall.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
theatreAddress.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
time.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addGap(0, 58, Short.MAX_VALUE)
.addComponent(jLabel11, javax.swing.GroupLayout.PREFERRED_SIZE, 572, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(20, 20, 20))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(37, 37, 37)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, 108, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, 108, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(75, 75, 75)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(userName, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 390, Short.MAX_VALUE)
.addComponent(movie, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(theatre, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(orderId, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
.addComponent(jLabel9, javax.swing.GroupLayout.PREFERRED_SIZE, 123, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel8, javax.swing.GroupLayout.PREFERRED_SIZE, 177, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel7, javax.swing.GroupLayout.PREFERRED_SIZE, 108, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel10, javax.swing.GroupLayout.PREFERRED_SIZE, 123, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(hall, javax.swing.GroupLayout.DEFAULT_SIZE, 390, Short.MAX_VALUE)
.addComponent(theatreAddress, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(date, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(time, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 108, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 108, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(76, 76, 76)
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 456, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel11, javax.swing.GroupLayout.PREFERRED_SIZE, 69, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 47, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 68, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(orderId, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 54, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(userName, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, 68, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(movie, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(theatre, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel7, javax.swing.GroupLayout.PREFERRED_SIZE, 68, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(hall))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel8, javax.swing.GroupLayout.PREFERRED_SIZE, 68, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(theatreAddress, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel9, javax.swing.GroupLayout.PREFERRED_SIZE, 68, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(date, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel10, javax.swing.GroupLayout.PREFERRED_SIZE, 68, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(time, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(45, 45, 45))
);
getContentPane().add(jPanel1);
jPanel1.setBounds(0, 0, 650, 720);
pack();
}// </editor-fold>
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(PrintTicket.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(PrintTicket.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(PrintTicket.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(PrintTicket.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new PrintTicket().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel date;
private javax.swing.JLabel hall;
private javax.swing.JLabel jLabel10;
private javax.swing.JLabel jLabel11;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel6;
private javax.swing.JLabel jLabel7;
private javax.swing.JLabel jLabel8;
private javax.swing.JLabel jLabel9;
private javax.swing.JPanel jPanel1;
private javax.swing.JLabel movie;
private javax.swing.JLabel orderId;
private javax.swing.JLabel theatre;
private javax.swing.JLabel theatreAddress;
private javax.swing.JLabel time;
private javax.swing.JLabel userName;
// End of variables declaration
}

Java Create an empty .ser file on resource folder if not exists yet

I want to create an empty .ser file to store an arraylist of objects if not created yet, to use later in program .I will add if not exist check later after figuring out my current problem.I am having a nullpointer exception on my File = new File(etc etc) row.Here is a better explanation with the screenshot.
edit:Added source codes
/*
* To change this license header, choose License Headers in Project
Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package dark.rusty;
import java.awt.Color;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
/**
*
* #author UoD
*/
public class Gui extends javax.swing.JFrame {
/**
* Creates new form Gui
*/
public Gui() {
initComponents();
setLocationRelativeTo(null);
setTitle("CMS - Dark&Rusty");
this.getContentPane().setBackground(new Color(190, 190, 190));
MenuItem a = new MenuItem("temp", 0, 0);
ArrayList<MenuItem> tempAList = new ArrayList<MenuItem>();
createFileIFN();
}
private void createFileIFN() {
try {
File myFile = new File((this.getClass().getResource("/text/menu.ser").toString());
if (myFile.createNewFile()) {
System.out.println("File is created!");
} else {
System.out.println("File already exists.");
}
} catch (IOException e) {
e.printStackTrace();
}
}
private ArrayList<MenuItem> getArrList(File tempFile) {
ArrayList<MenuItem> items = new ArrayList<MenuItem>();
MenuItem tempItem;
try {
FileInputStream fileIn = new FileInputStream(tempFile);
ObjectInputStream in = new ObjectInputStream(fileIn);
tempItem = (MenuItem) in.readObject();
in.close();
fileIn.close();
} catch (IOException i) {
i.printStackTrace();
} catch (ClassNotFoundException c) {
System.out.println("Employee class not found");
c.printStackTrace();
}
return items;
}
private void writeItemtoFile(MenuItem a, File tempFile) {
try {
FileOutputStream fos = new FileOutputStream(tempFile);
ObjectOutputStream oos = new ObjectOutputStream(fos);
// write object to file
oos.writeObject(a);
// closing resources
oos.close();
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 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.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jButton7 = new javax.swing.JButton();
jButton8 = new javax.swing.JButton();
jPanel2 = new javax.swing.JPanel();
jScrollPane2 = new javax.swing.JScrollPane();
jList2 = new javax.swing.JList<>();
jButton6 = new javax.swing.JButton();
jPanel3 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jLabel5 = new javax.swing.JLabel();
jLabel6 = new javax.swing.JLabel();
jButton9 = new javax.swing.JButton();
jButton10 = new javax.swing.JButton();
jScrollPane3 = new javax.swing.JScrollPane();
jList3 = new javax.swing.JList<>();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setBackground(new java.awt.Color(190, 190, 190));
setResizable(false);
setSize(new java.awt.Dimension(800, 600));
jPanel1.setBackground(new java.awt.Color(190, 190, 190));
jPanel1.setPreferredSize(new java.awt.Dimension(800, 50));
jButton7.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/if_Sidebar_Left_Interface_Menu_Window_1654369.png"))); // NOI18N
jButton7.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
jButton7.setMargin(new java.awt.Insets(2, 20, 2, 20));
jButton7.setPreferredSize(new java.awt.Dimension(32, 32));
jPanel1.add(jButton7);
jButton8.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/if_TaskStroke_1737368.png"))); // NOI18N
jButton8.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
jButton8.setMargin(new java.awt.Insets(2, 20, 2, 20));
jButton8.setPreferredSize(new java.awt.Dimension(32, 32));
jPanel1.add(jButton8);
jPanel2.setBackground(new java.awt.Color(190, 190, 190));
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 800, Short.MAX_VALUE)
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 100, Short.MAX_VALUE)
);
jScrollPane2.setPreferredSize(new java.awt.Dimension(300, 120));
jList2.setBackground(new java.awt.Color(190, 190, 190));
jList2.setBorder(javax.swing.BorderFactory.createMatteBorder(2, 2, 2, 2, new java.awt.Color(240, 240, 240)));
jList2.setFont(new java.awt.Font("Rockwell", 1, 14)); // NOI18N
jList2.setModel(new javax.swing.AbstractListModel<String>() {
String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
public int getSize() { return strings.length; }
public String getElementAt(int i) { return strings[i]; }
});
jList2.setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION);
jList2.setPreferredSize(new java.awt.Dimension(290, 80));
jScrollPane2.setViewportView(jList2);
jButton6.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/if_Tick_1737369 (1).png"))); // NOI18N
jButton6.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
jButton6.setPreferredSize(new java.awt.Dimension(32, 32));
jButton6.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton6ActionPerformed(evt);
}
});
jPanel3.setBackground(new java.awt.Color(190, 190, 190));
jPanel3.setPreferredSize(new java.awt.Dimension(290, 136));
jLabel1.setFont(new java.awt.Font("Poiret One", 1, 24)); // NOI18N
jLabel1.setForeground(new java.awt.Color(51, 102, 0));
jLabel1.setText("Kalan:");
jLabel1.setPreferredSize(new java.awt.Dimension(120, 30));
jLabel2.setFont(new java.awt.Font("Poiret One", 1, 24)); // NOI18N
jLabel2.setForeground(new java.awt.Color(204, 0, 51));
jLabel2.setText("Odenen:");
jLabel2.setPreferredSize(new java.awt.Dimension(120, 30));
jLabel3.setFont(new java.awt.Font("Poiret One", 1, 24)); // NOI18N
jLabel3.setForeground(new java.awt.Color(0, 153, 255));
jLabel3.setText("0");
jLabel3.setToolTipText("");
jLabel3.setPreferredSize(new java.awt.Dimension(120, 30));
jLabel4.setFont(new java.awt.Font("Poiret One", 1, 24)); // NOI18N
jLabel4.setForeground(new java.awt.Color(51, 102, 0));
jLabel4.setText("5.00");
jLabel4.setPreferredSize(new java.awt.Dimension(120, 30));
jLabel5.setFont(new java.awt.Font("Poiret One", 1, 24)); // NOI18N
jLabel5.setForeground(new java.awt.Color(204, 0, 51));
jLabel5.setText("13.00");
jLabel5.setPreferredSize(new java.awt.Dimension(120, 30));
jLabel6.setFont(new java.awt.Font("Poiret One", 1, 24)); // NOI18N
jLabel6.setForeground(new java.awt.Color(0, 153, 255));
jLabel6.setText("İptal:");
jLabel6.setPreferredSize(new java.awt.Dimension(120, 30));
javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
jPanel3.setLayout(jPanel3Layout);
jPanel3Layout.setHorizontalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel3Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel3Layout.createSequentialGroup()
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 40, Short.MAX_VALUE)
.addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel3Layout.createSequentialGroup()
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel3Layout.createSequentialGroup()
.addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap())
);
jPanel3Layout.setVerticalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel3Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 13, Short.MAX_VALUE)
.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap())
);
jButton9.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/if_Dollar_1737376(1).png"))); // NOI18N
jButton9.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
jButton9.setPreferredSize(new java.awt.Dimension(32, 32));
jButton10.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/if_Wrong_1737371.png"))); // NOI18N
jButton10.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
jButton10.setPreferredSize(new java.awt.Dimension(32, 32));
jScrollPane3.setPreferredSize(new java.awt.Dimension(300, 120));
jList3.setBackground(new java.awt.Color(190, 190, 190));
jList3.setBorder(javax.swing.BorderFactory.createMatteBorder(2, 2, 2, 2, new java.awt.Color(240, 240, 240)));
jList3.setFont(new java.awt.Font("Rockwell", 1, 14)); // NOI18N
jList3.setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION);
jList3.setPreferredSize(new java.awt.Dimension(290, 80));
jScrollPane3.setViewportView(jList3);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addGap(6, 6, 6)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jButton6, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton9, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(0, 0, Short.MAX_VALUE)
.addComponent(jButton10, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(10, 10, 10)))
.addGap(0, 0, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, 300, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jButton6, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addComponent(jButton9, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton10, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addComponent(jScrollPane3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 182, Short.MAX_VALUE)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
);
pack();
}// </editor-fold>
private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Gui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Gui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Gui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Gui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Gui().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton10;
private javax.swing.JButton jButton6;
private javax.swing.JButton jButton7;
private javax.swing.JButton jButton8;
private javax.swing.JButton jButton9;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel6;
private javax.swing.JList<String> jList2;
private javax.swing.JList<String> jList3;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JPanel jPanel3;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JScrollPane jScrollPane3;
// End of variables declaration
}

this.getClass().getResource("/text/menu.ser")
will return null if "/text/menu.ser" does not exists. Consequently,
this.getClass().getResource("/text/menu.ser").toString()
will result in a NullPointerException.
Moreover, getResource returns an URL instance and an URL's string reprensentation (e.g. file:/home/user3524633/text/menu.ser) is not the same as a local file system path (which is what you want to use with the File constructor).
Why are you using getResource in the first place? Are you trying to determine a path relative to your application's classes?

Set a JFrame to appear in center not working?

I am developing a swing application and I created a log in form. I set it appear in center of the screen but not working :( I tried two ways (1) and (2) but both not working.
I cant understand why. Because both of the solutions were in this site.
My Code:
public class LoginForm extends javax.swing.JFrame {
public LoginForm() {
/*Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
this.setLocation(dim.width/2-this.getSize().width/2, dim.height/2- this.getSize().height/2);*/ // ----> (1)
setLocationRelativeTo(null); // ----> (2)
initComponents();
}
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JPanel jPanel1;
private javax.swing.JPasswordField jPasswordField1;
private javax.swing.JTextField jTextField1;
private java.awt.Label label1;
private void initComponents() {
setUndecorated(true);
jPanel1 = new javax.swing.JPanel();
jTextField1 = new RoundJTextField(20);
jPasswordField1 = new RoundJPasswordField(20);
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
label1 = new java.awt.Label();
jButton2 = new javax.swing.JButton();
jButton1 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setBackground(new java.awt.Color(255, 255, 255));
setBounds(new java.awt.Rectangle(5, 0, 0, 0));
setName("LogInFrame"); // NOI18N
setResizable(false);
jPanel1.setBackground(new java.awt.Color(255, 255, 255));
jPanel1.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));
jLabel1.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
jLabel1.setText("Username");
jLabel2.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
jLabel2.setText("Password");
label1.setFont(new java.awt.Font("SansSerif", 1, 18)); // NOI18N
label1.setText("UAC Login");
jButton2.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/windows_close_program.png"))); // NOI18N
jButton2.setActionCommand("loginExit");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
jButton1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/go.JPG"))); // NOI18N
jButton1.setActionCommand("LoginButton");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/join.JPG"))); // NOI18N
jButton3.setText("jButton3");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(60, 60, 60)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 104, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel2))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jPasswordField1, javax.swing.GroupLayout.DEFAULT_SIZE, 198, Short.MAX_VALUE)
.addComponent(jTextField1)
.addComponent(label1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(21, 21, 21)
.addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 262, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 55, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 81, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(22, 22, 22))))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(20, 20, 20)
.addComponent(label1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(2, 2, 2)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 207, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(46, Short.MAX_VALUE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(57, 57, 57)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(40, 40, 40)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(jPasswordField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 24, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(34, 34, 34))))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(0, 0, Short.MAX_VALUE)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 0, 0))
);
pack();
}// </editor-fold>
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
System.exit(0);
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
this.setVisible(false);
this.dispose();
new RegistrationForm();
}
public static void main(String args[]) {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Synth".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(LoginForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(LoginForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(LoginForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(LoginForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new LoginForm().setVisible(true);
}
});
}
}

Your order is off:
Add components first.
Then pack()
Then setLocationRelativeTo(null) -- you're doing this too early
Then setVisible(true)

setLocationRelativeTo will use the frames current size to determine how best to achieve the desired results. Seen as you've not actually added anything to the frame AND you've not set it's size, the only value it has to go on is 0x0 (size).
Try move setLocationRelativeTo after initComponents, but adding pack before you call it, for example...
public LoginForm() {
/*Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
this.setLocation(dim.width/2-this.getSize().width/2, dim.height/2- this.getSize().height/2);*/ // ----> (1)
initComponents();
pack();
setLocationRelativeTo(null); // ----> (2)
}

If you are using **netBeanIDE 7.**3. you may do this as.
->in design ,right click -> select properties and
and checked generate center.it will solve your problem without looking into code.
Hope it may help u.