Please help! not serializableException: im not sure why!

Question

hello all,
im using a JTable and would like to save the information in the table. whe the user presses the save button, i would like to call my save methods, but i end up with a serializable exception on my filfilter. I am not sue why this occurs, so im hoping someone could tell me. My code calling the save method is below, any help is most appreciated, thats.
java.io.NotSerializableException: FileOperations$MyFileFilter
private FileOperations fileOp;
fileOp = new FileOperations(this);
saveItem.setAccelerator(KeyStroke.getKeyStroke('S',ActionEvent.CTRL_MASK ));
saveItem.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent e) {
     fileOp.saveFile();
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.filechooser.FileFilter;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import java.awt.print.*;
public class FileOperations {
     final private static String extenstion = ".tm";
     private MySpread mySpread;
     private MyNewTable table;
     public myTableModel tableModel;
    private File file;
     private StringTokenizer tokenizer;
   public PrintStream out;
   // private ObjectOutputStream out;
      private ObjectInputStream out1;
    private BufferedReader in;
    private transient JFileChooser fileChooser;
    private transient MyFileFilter filter;
     class MyFileFilter extends FileFilter{
            public boolean accept(File file){
                return (file.isDirectory()||file.getName().toLowerCase().endsWith(extenstion));
          public String getDescription() {
         return "Spreadsheet (*.tm)";
    public FileOperations(MySpread gui) {
          mySpread = gui;
          table = mySpread.getTable();
          tableModel = mySpread.getTheTableModel();
          fileChooser = getFileChooser();
          filter = new MyFileFilter();
          fileChooser.addChoosableFileFilter(filter);
          mySpread.setTitle("Untitled");
     private JFileChooser getFileChooser() {
            if (this.fileChooser == null) {
           this.fileChooser = new JFileChooser(new File("."));
       } return this.fileChooser;
         public int querySave() {
     // show confirm dialog box from static JOptionPane method
     String filename = "Spreadsheet";
     if (file != null)
         filename = file.getName();
     int choice = JOptionPane.showInternalConfirmDialog(mySpread,"Do you want to save the changes you made to \""+filename+"\"?",
          "Save",
          JOptionPane.YES_NO_CANCEL_OPTION,
          JOptionPane.QUESTION_MESSAGE);
     // return user's choice
     return choice;
    public  void saveFile() {
         if (tableModel == null){System.out.print("ross");}
     if(tableModel.isChanged()) {
          System.out.print("tm has changed");
         if (file == null) {
          saveAsFile();
         } else {
          saveTableModel();
    System.out.print("tm has not changed");
     public void saveAsFile() {
     // open save dialog and save user input
     int choice = fileChooser.showSaveDialog(mySpread);
     // if user clicks ok, then procede with save, otherwise do nothing
     if(choice == JFileChooser.APPROVE_OPTION) {
         // get selected file to save to
         File selectedfile = fileChooser.getSelectedFile();
         fileChooser = new JFileChooser(selectedfile.getParentFile());
         fileChooser.addChoosableFileFilter(filter);
         // enforce the extenstion name
         String path;
         try {
          path = selectedfile.getCanonicalPath();
         catch (IOException e) {
          JOptionPane.showMessageDialog(mySpread, "Save","Unexpted Error",
                           JOptionPane.ERROR_MESSAGE, null);
          return;
         if (!path.endsWith(extenstion))
          selectedfile = new File(path+extenstion);
         // check the existence of the file
         if (selectedfile.exists()) {
          choice =
              JOptionPane.showInternalConfirmDialog
              (mySpread,
               "File "+selectedfile.getName()+" already exists.\n\n"+
               "Do you want to overwrite it?\n\n",
               "Save",
               JOptionPane.YES_NO_OPTION,
               JOptionPane.WARNING_MESSAGE);
          if (choice != JOptionPane.YES_OPTION)
              return;
       //  saveTableModel(selectedfile);
         writeDataTable(selectedfile);
         file = aFile;
           tableModel.setChanged(false);
         String title = file.getName();
         if (title.endsWith(extenstion))
          title = title.substring(0, title.length()-4);
         mySpread.setTitle(title);
     } catch (FileNotFoundException e) {
         JOptionPane.showMessageDialog(mySpread,"Open", "File \""+aFile.getName()+"\" not found!",JOptionPane.ERROR_MESSAGE, null);
     } catch (IOException e) {
         JOptionPane.showMessageDialog(mySpread,"Save", "File \""+aFile.getName()+"\" cannot be created!",JOptionPane.ERROR_MESSAGE, null);
    private void writeDataTable(File selectedFile)   {
             ObjectOutputStream oos = null;
              try { 
                oos = new ObjectOutputStream(new FileOutputStream(selectedFile));//only write out the models header plus data 
             //   oos.writeObject(model.getColumnIdentifiers());     
                oos.writeObject(tableModel.getDataVector());   
              }      catch (Exception e)   {   
                    e.printStackTrace();   
                finally      { if (oos != null){  
                      try{   
                     oos.flush();    
               catch (IOException ioe){}; 
                try{   
                      oos.close();   
                 catch (IOException ioe){};  
//           file = aFile;
file = selectedFile;
           tableModel.setChanged(false);
         String title = file.getName();
         if (title.endsWith(extenstion))
          title = title.substring(0, title.length()-4);
         mySpread.setTitle(title);
      }     //end writeDataTable
     if(tableModel.isChanged()){
          System.out.println("i get here. open file, tm is changed \n");
         choice = querySave();
     else
         choice = JOptionPane.NO_OPTION;
     System.out.println("i get here. open file, tm has notchnaged changed \n");   
     switch(choice) {
       case JOptionPane.YES_OPTION:
           // if user chooses yes in dialog box, save document first
           // before executing clear range
           saveFile();
         case JOptionPane.NO_OPTION:
           // open dialog from filechooser and save user choice
           int userChoice = fileChooser.showOpenDialog(mySpread);
           // if user chooses file, call openTableModel on new
           // FileOperations object, else go to break in default
           if(userChoice == JFileChooser.APPROVE_OPTION) {
            File selectedfile = fileChooser.getSelectedFile();
            fileChooser = new JFileChooser(selectedfile.getParentFile());
            fileChooser.addChoosableFileFilter(filter);
            loadModel(selectedfile);
           break;
    public void saveTableModel() {
     writeDataTable(file);

Answer 1

Hi - thanks for your replies.
my table is clas is below. also is the full error i get. I hope you can help with this, im honestly quite confussed.
import javax.swing.*;
import java.awt.*;
import javax.swing.event.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.table.*;
import java.io.File;
import javax.swing.border.*;
public class MyNewTable extends JTable {
     public MyNewTable (int x, int y){
          super(x,y);
     public void setValueAt(Object aValue, int row, int column) {
          System.out.println("t\ble value being set");
          TableModel mod = getModel();
          mod.setValueAt(aValue, row, column);
}full error
java.io.NotSerializableException: FileOperations$MyFileFilter
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
        at javax.swing.JFileChooser.writeObject(Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
        at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
        at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.writeArray(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
        at java.awt.Container.writeObject(Unknown Source)
        at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
        at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
        at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.writeArray(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
        at java.awt.Container.writeObject(Unknown Source)
        at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
        at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
        at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.writeArray(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
        at java.awt.Container.writeObject(Unknown Source)
        at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
        at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
        at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.writeArray(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
        at java.awt.Container.writeObject(Unknown Source)
        at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
        at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
        at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.writeObject(Unknown Source)
        at java.awt.Window.writeObject(Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
        at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
        at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.writeObject(Unknown Source)
        at javax.swing.event.EventListenerList.writeObject(Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
        at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
        at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
        at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
        at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
        at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
        at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
        at javax.swing.JTable.writeObject(Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
        at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
        at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.writeObject(Unknown Source)
        at javax.swing.event.EventListenerList.writeObject(Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
        at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
        at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
        at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
        at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
        at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
        at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.writeArray(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
        at java.util.Vector.writeObject(Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
        at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
        at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.writeArray(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
        at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
        at java.util.Vector.writeObject(Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
        at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
        at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
        at java.io.ObjectOutputStream.writeObject0(Unknown Source)
        at java.io.ObjectOutputStream.writeObject(Unknown Source)
        at FileOperations.writeDataTable(FileOperations.java:182)
        at FileOperations.saveAsFile(FileOperations.java:126)
        at FileOperations.saveFile(FileOperations.java:73)
        at MySpread$12.actionPerformed(MySpread.java:185)
        at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
        at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Unknow
n Source)
        at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
        at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Sour
ce)
        at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
        at java.awt.Component.processMouseEvent(Unknown Source)
        at java.awt.Component.processEvent(Unknown Source)
        at java.awt.Container.processEvent(Unknown Source)
        at java.awt.Component.dispatchEventImpl(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Window.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)
tm has not changedjava.lang.NullPointerException
        at javax.swing.plaf.basic.BasicTableUI.getPreferredSize(Unknown Source)
        at javax.swing.JComponent.getPreferredSize(Unknown Source)
        at javax.swing.ScrollPaneLayout.layoutContainer(Unknown Source)
        at java.awt.Container.layout(Unknown Source)
        at java.awt.Container.doLayout(Unknown Source)
        at java.awt.Container.validateTree(Unknown Source)
        at java.awt.Container.validateTree(Unknown Source)
        at java.awt.Container.validateTree(Unknown Source)
        at java.awt.Container.validateTree(Unknown Source)
        at java.awt.Container.validate(Unknown Source)
        at javax.swing.RepaintManager.validateInvalidComponents(Unknown Source)
        at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(Unknow
n Source)
        at java.awt.event.InvocationEvent.dispatch(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)
java.lang.NullPointerException
        at javax.swing.plaf.basic.BasicTableUI.paint(Unknown Source)
        at javax.swing.plaf.ComponentUI.update(Unknown Source)
        at javax.swing.JComponent.paintComponent(Unknown Source)
        at javax.swing.JComponent.paint(Unknown Source)
        at javax.swing.JComponent.paintChildren(Unknown Source)
        at javax.swing.JComponent.paint(Unknown Source)
        at javax.swing.JViewport.paint(Unknown Source)
        at javax.swing.JComponent.paintChildren(Unknown Source)
        at javax.swing.JComponent.paint(Unknown Source)
        at javax.swing.JComponent.paintChildren(Unknown Source)
        at javax.swing.JComponent.paint(Unknown Source)
        at javax.swing.JComponent.paintChildren(Unknown Source)
        at javax.swing.JComponent.paint(Unknown Source)
        at javax.swing.JLayeredPane.paint(Unknown Source)
        at javax.swing.JComponent.paintChildren(Unknown Source)
        at javax.swing.JComponent.paintWithOffscreenBuffer(Unknown Source)
        at javax.swing.JComponent.paintDoubleBuffered(Unknown Source)
        at javax.swing.JComponent.paint(Unknown Source)
        at java.awt.GraphicsCallback$PaintCallback.run(Unknown Source)
        at sun.awt.SunGraphicsCallback.runOneComponent(Unknown Source)
        at sun.awt.SunGraphicsCallback.runComponents(Unknown Source)
        at java.awt.Container.paint(Unknown Source)
        at sun.awt.RepaintArea.paint(Unknown Source)
        at sun.awt.windows.WComponentPeer.handleEvent(Unknown Source)
        at java.awt.Component.dispatchEventImpl(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Window.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)Thanks