I am trying to serialize a JFrame , but its returning a java.io.NotSerializableException. I am designing an application and the following was just a poc on trying to serialize a jframe. The serialization is working fine for the employee subclass, but its not working for the swing JFrame. I am unable to understand why, since all the fields are static. Could someone please throw some light on this? Here is my code:
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JOptionPane;
/**
*
* @author SamDescartes
*/
public class SerDemo extends javax.swing.JFrame implements java.io.Serializable{
//private static final long serialVersionUID = 1L;
private static int empNo;
private static final String fileName="C:\\Users\\Public\\Documents\\AtlizerProjects\\tmp\\SerDemo.ser";
/**
* Creates new form SerDemo
*/
public SerDemo() {
initComponents();
initMine();
}
/**
* 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() {
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jTextField1 = new javax.swing.JTextField();
jTextField2 = new javax.swing.JTextField();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.DO_NOTHING_ON_CLOSE);
jLabel1.setText("Name: ");
jLabel2.setText("Aadhar No:");
jButton1.setText("Ok");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText("Show");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 188, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(layout.createSequentialGroup()
.addComponent(jButton1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton2))
.addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, 188, javax.swing.GroupLayout.PREFERRED_SIZE))))
.addContainerGap(11, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(19, 19, 19)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(jTextField1, 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(jLabel2)
.addComponent(jTextField2, 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(jButton1)
.addComponent(jButton2))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
e=new Employee();
e.name=jTextField1.getText();
e.aadharNo=jTextField2.getText();
this.empNo=this.empNo+1;
String empFileName="employee"+this.empNo;
eMap.put(this.empNo,empFileName);
try{
FileOutputStream fileOut = new FileOutputStream("C:\\Users\\Public\\Documents\\AtlizerProjects\\tmp\\"+empFileName);
ObjectOutputStream out = new ObjectOutputStream(fileOut);
out.writeObject(e);
out.close();
fileOut.close();
System.out.println("Serialized data is saved in C:\\Users\\Public\\Documents\\AtlizerProjects\\tmp\\"+empFileName);
}catch(IOException ex){
Logger.getLogger(SerDemo.class.getName()).log(Level.SEVERE, null, ex);
}
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
try{
for(int i=1;i<=this.empNo;i++){
String eFile=(String) eMap.get(i);
System.out.println(eMap);
Employee em=null;
FileInputStream fileIn = new FileInputStream("C:\\Users\\Public\\Documents\\AtlizerProjects\\tmp\\"+eFile);
ObjectInputStream in = new ObjectInputStream(fileIn);
em = (Employee) in.readObject();
in.close();
fileIn.close();
System.out.println(em.aadharNo+","+em.name);
}
}catch( IOException | ClassNotFoundException ex){
Logger.getLogger(SerDemo.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(SerDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
// } catch (InstantiationException ex) {
// java.util.logging.Logger.getLogger(SerDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
// } catch (IllegalAccessException ex) {
// java.util.logging.Logger.getLogger(SerDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
// } catch (javax.swing.UnsupportedLookAndFeelException ex) {
// java.util.logging.Logger.getLogger(SerDemo.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() {
try{
File f;
f = new File(SerDemo.fileName);
if(f.isFile()){
SerDemo ser=null;
FileInputStream fileIn = new FileInputStream("C:\\Users\\Public\\Documents\\AtlizerProjects\\tmp\\serDemo.ser");
ObjectInputStream ois = new ObjectInputStream(fileIn);
ser = (SerDemo) ois.readObject();
ois.close();
fileIn.close();
ser.setVisible(true);
}else{
new SerDemo().setVisible(true);
}
}catch(Exception ex){
Logger.getLogger(SerDemo.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField2;
// End of variables declaration
Employee e;
ArrayList<Employee> eList;
LinkedHashMap eMap;
private void initMine() {
eList=new ArrayList<>();
eMap=new LinkedHashMap();
WindowListener exitListener = new WindowAdapter(){
@Override
public void windowClosing(WindowEvent e){
int confirm = JOptionPane.showOptionDialog(null, "Are You Sure to Close Application?", "Exit Confirmation", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, null, null);
System.out.println(confirm);
if(confirm==0){
try{
FileOutputStream serDemo =new FileOutputStream("C:\\Users\\Public\\Documents\\AtlizerProjects\\tmp\\serDemo.ser");
ObjectOutputStream oos = new ObjectOutputStream(serDemo);
oos.writeObject(this);
oos.close();
serDemo.close();
} catch (FileNotFoundException ex) {
Logger.getLogger(SerDemo.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(SerDemo.class.getName()).log(Level.SEVERE, null, ex);
}
System.exit(0);
}else{
System.out.println("Hello Again");
}
}
};
addWindowListener(exitListener);
}
}
The error message encountered is:
Sep 19, 2013 5:25:33 PM com.sl.app.SerDemo$4 windowClosing
SEVERE: null
java.io.NotSerializableException: com.sl.app.SerDemo$4
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1180)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
at com.sl.app.SerDemo$4.windowClosing(SerDemo.java:231)
at java.awt.Window.processWindowEvent(Window.java:2051)
at javax.swing.JFrame.processWindowEvent(JFrame.java:296)
at java.awt.Window.processEvent(Window.java:2009)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:688)
at java.awt.EventQueue$3.run(EventQueue.java:686)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:702)
at java.awt.EventQueue$4.run(EventQueue.java:700)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
