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adding dynamicly TitledPanes to Accordion

So I'm creating a program that gets the swagger doc.json, extracts all the REST Apis then shows them in an Accordion: the problem is that the Accordion won't work for me because TitledPanes are added dynamically: i.e: for each Rest API endpoint extracted out of the JSON file a new TitledPane will show up.
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Map;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import io.swagger.models.HttpMethod;
import io.swagger.models.Operation;
import io.swagger.models.Path;
import io.swagger.models.Response;
import io.swagger.models.Swagger;
import io.swagger.models.parameters.Parameter;
import io.swagger.parser.SwaggerParser;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TitledPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class GroupOfTitledPane extends Application {
JFrame frame;
JTextField t1;
JButton btn;
int i;
#Override
public void start(final Stage stage) {
frame=new JFrame();
frame.setLayout(null);
frame.setSize(400,250);
frame. setLocation(500,300);
t1=new JTextField();
t1.setBounds(60,40,270,30);
frame.add(t1);
btn=new JButton("SUBMIT");
btn.setBounds(140,90,100,30);
frame.add(btn);
frame.setVisible(true);
btn.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
if(e.getSource()==btn)
{
String input=t1.getText();
if(input.isEmpty() || input.equals(" "))
{
JOptionPane.showMessageDialog(null,"Veuillez saisir l'adresse de l'URL");
}
else{
URL urldoc = null;
try {
urldoc = new URL(input);
}
catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
String url = new String("https://"+urldoc.getAuthority()+"/v2/swagger.json");
System.out.println(url);
Swagger swagger = new SwaggerParser().read(url);
Map<String, Path> paths = swagger.getPaths();
// Create Root Pane.
VBox root = new VBox();
root.setPadding(new Insets(20, 10, 10, 10));
for (Map.Entry<String, Path> p : paths.entrySet()) {
Path path = p.getValue();
Map<HttpMethod, Operation> operations = path.getOperationMap();
for (java.util.Map.Entry<HttpMethod, Operation> o : operations.entrySet()) {
System.out.println("===");
System.out.println("PATH:" + p.getKey());
System.out.println("Http method:" + o.getKey());
System.out.println("Summary:" + o.getValue().getSummary());
System.out.println("Parameters number: " + o.getValue().getParameters().size());
for (Parameter parameter : o.getValue().getParameters()) {
System.out.println(" - " + parameter.getName());
}
System.out.println("Responses:");
for (Map.Entry<String, Response> r : o.getValue().getResponses().entrySet()) {
System.out.println(" - " + r.getKey() + ": " + r.getValue().getDescription());
}
// Create First TitledPane.
TitledPane firstTitledPane = new TitledPane();
firstTitledPane.setText((o.getKey()).toString() + ":" + (p.getKey()).toString());
VBox content1 = new VBox();
content1.getChildren().add(new Label("Java Swing Tutorial"));
content1.getChildren().add(new Label("JavaFx Tutorial"));
content1.getChildren().add(new Label("Java IO Tutorial"));
firstTitledPane.setContent(content1);
root.getChildren().addAll(firstTitledPane);
Scene scene = new Scene(root, 300, 200);
stage.setScene(scene);
stage.show();
}
}
}
}
}
});
}
public static void main(String[] args) {
Application.launch(args);
}
}
And here is the error:
https://petstore.swagger.io/v2/swagger.json 0 [AWT-EventQueue-0] INFO io.swagger.parser.Swagger20Parser - reading from https://petstore.swagger.io/v2/swagger.json
=== PATH:/pet/{petId} Http method:GET Summary:Find pet by ID Parameters number: 1
- petId Responses:
- 200: successful operation
- 400: Invalid ID supplied
- 404: Pet not found Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException:
Not on FX application thread; currentThread = AWT-EventQueue-0
at com.sun.javafx.tk.Toolkit.checkFxUserThread(Toolkit.java:279)
atcom.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(QuantumToolkit.java:444) at javafx.stage.Window.setShowing(Window.java:939) at javafx.stage.Window.show(Window.java:955) at javafx.stage.Stage.show(Stage.java:259) at GroupOfTitledPane$1.actionPerformed(GroupOfTitledPane.java:102) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.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.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$500(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(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)

Getting Checked Exception while running a SQL Program

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.PrintWriter;
import java.sql.*;
import java.net.*;
public class connection {
JTextField textfeild;
JButton button;
String text;
Socket sock;
PrintWriter writer;
JButton button1;
public static void main(String[] args) {
connection user1 = new connection();
user1.go();
}//main method close
public void go() {
JFrame frame12 = new JFrame();
JPanel centerpanel12 = new JPanel();
centerpanel12.setLayout(new BoxLayout(centerpanel12, BoxLayout.Y_AXIS));
textfeild = new JTextField(20);
centerpanel12.add(textfeild);
//textfeild.addActionListener(new textfeildlitner());
frame12.add(centerpanel12);
button = new JButton("Click Me");
centerpanel12.add(button);
button.addActionListener(new buttonlitner());
button1 = new JButton("DataDisplay");
centerpanel12.add(button1);
button1.addActionListener(new buttonlitner1());
frame12.getContentPane().add(BorderLayout.CENTER, centerpanel12);
frame12.pack();
frame12.setVisible(true);
frame12.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}//go method close
/*class textfeildlitner implements ActionListener{
public void actionPerformed(ActionEvent ev){
}
}//inner class textfeildlitner close*/
class buttonlitner implements ActionListener {
public void actionPerformed(ActionEvent ev) {
button.setText("I AM Clicked");
String name = textfeild.getText();
System.out.println(name);
textfeild.setText("");
textfeild.requestFocus();
}//method close
}//inner class close
class buttonlitner1 implements ActionListener {
void connection() {
try {
String user = "SQlUI";
String pass = "123456";
String db = "jdbc:sqlserver://localhost:1234;" + ";databaseName=SQlUI";
Class.forName("com.microsoft.sqlserver.jdbc");
Connection con = DriverManager.getConnection(db, user, pass);
Statement s1 = con.createStatement();
ResultSet r1 = s1.executeQuery("select * from Table_1");
String[] result = new String[20];
if (r1 != null) {
while (r1.next()) {
for (int i = 0; i < result.length; i++) {
for (int j = 0; j < result.length; j++) {
result[j] = r1.getString(i);
System.out.println(result[j]);
}//for j
}//for i
}//if
}//try
} catch (Exception ex) {
ex.printStackTrace();
}//catch
}//connection()
public void actionPerformed(ActionEvent ev) {
button1.setText("Processing");
new buttonlitner1().connection();
}//method close
}//inner class close
}// outer class close
While running this code i am getting following exception----
java.lang.ClassNotFoundException: com.microsoft.sqlserver.jdbc
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at connection$buttonlitner1.connection(connection.java:66)
at connection$buttonlitner1.actionPerformed(connection.java:89)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.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.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(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)
Don't know why its happening. I have added the sqlserver.jar in eclipse external library.
The connection name
String db="jdbc:sqlserver://localhost:1234;"+";databaseName=SQlUI";
is correct. i am attaching the screenshot of the sqlserver.jar which i have added to external library.

The driver class is com.microsoft.sqlserver.jdbc.SQLServerDriver and not com.microsoft.sqlserver.jdbc. Try to use:
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

Java Moving an Image with separate class

I am making a small hobby game, I have a couple of classes so far. There are two classes that I am having some issues with, the classes in question are listed below.
Screen.Java
package geisst.flat;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
public class Screen extends JFrame {
public int x = 100;
public int y = 100;
public Screen() {
this.setSize(400, 400);
this.setTitle("Flat Game");
this.setResizable(false);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
addKeyListener(new KeyListen());
}
public void paint(Graphics g) {
BufferedImage mainImage = null;
try {
mainImage = ImageIO.read(new File("res/test.gif"));
} catch(IOException e) {
}
g.drawImage(mainImage, x, y, null);
repaint();
}
}
And KeyListen.Java
package geisst.flat;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
public class KeyListen extends KeyAdapter {
Screen screen;
#Override
public void keyPressed(KeyEvent e) {
int keyCode = e.getKeyCode();
if(keyCode == KeyEvent.VK_LEFT) {
screen.x += 3;
}
}
}
KeyListen is supposed to move the mainImage's x position up by 3 pixels, but I recieve the following error.
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at geisst.flat.KeyListen.keyPressed(KeyListen.java:15)
at java.awt.Component.processKeyEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Window.processEvent(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.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(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.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(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)
Do you guy's and gal's have any idea why this would be happening? It's probably something really obvious :P
Thanks in advance,
GeissT

You are never initializing the value of screen.
What you can do is something like this:
In the KeyListener Class
public KeyListen (Screen screen) {
this.screen = screen;
}
and in the Screen Class:
addKeyListener(new KeyListen(this));

You never initialize screen, so it is null, and yet you use it's properties:
screen.x += 3;
You should pass a reference to the Screen object to the listener, or by calling getSource:
#Override
public void keyPressed(KeyEvent e) {
int keyCode = e.getKeyCode();
if(keyCode == KeyEvent.VK_LEFT) {
if (e.getSource() instanceof Screen)
((Screen)e.getSource()).x += 3;
}
}

1) not good idea paint directly to the JFrame, put there JPanel, JComponent or JLabel
2) for Swing JComponents is there paintComponent instead of paint, paint is correct method for painting to the RootPane or GlassPane (derived Component from JFrame)
3) use KeyBindings rather than KeyListener, because KeyListener doesn't works without Focus in the Window, not good idea to setFocusable to the ContentPane
4) use JComponent for Custom Painting or JLabel with Icon
5) example for KeyBindings here

Exception on deleting JList items on keypress

I'm getting a NullPointerException in my JList, but the source of the exception seems to be the Swing event handling code. The JList has a key listener which will delete the selected item when the Delete key is pressed. The exception is only thrown on the second and all subsequent deletions from the list. Any ideas on how to fix it?
Sample code to reproduce the problem and the exception that is produced are included below:
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Vector;
import javax.swing.JFrame;
import javax.swing.JList;
public class Sample {
public static void main(String[] args) {
final JFrame frame = new JFrame();
final Vector<String> list = new Vector<String>();
for (int i = 0; i < 5; ++i) {
list.add("String " + i);
}
final JList listView = new JList(list);
listView.addKeyListener(new KeyListener() {
#Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_DELETE) {
list.remove(listView.getSelectedIndex());
listView.updateUI();
}
}
#Override
public void keyReleased(KeyEvent e) { }
#Override
public void keyTyped(KeyEvent e) { }
});
frame.add(listView);
frame.pack();
frame.setVisible(true);
}
}
Here's the exception being thrown:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.plaf.basic.BasicListUI$Handler.isNavigationKey(Unknown Source)
at javax.swing.plaf.basic.BasicListUI$Handler.keyPressed(Unknown Source)
at java.awt.AWTEventMulticaster.keyPressed(Unknown Source)
at java.awt.Component.processKeyEvent(Unknown Source)
at javax.swing.JComponent.processKeyEvent(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.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(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.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(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)

The problem is in this line:
listView.updateUI();
Calling this method causes the current UI to be uninstalled from the JList, yet it is still being used to process events. This results in the NullPointerException you see. This isn't the method you want to call.
Try
listView.revalidate();
instead to cause the component to re-layout or perhaps just repaint() to get it to repaint.

list.registerKeyboardAction(this,
KeyStroke.getKeyStroke(KeyEvent.VK_DELETE, 0), JComponent.WHEN_FOCUSED);
EDIT: remove unrelated code

Instead of the updateUI() you should call the revalidate() and repaint() method. And probably a check if the element in the list really exists wouldn't be a bad idea.
#Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_A) {
if(list.get(listView.getSelectedIndex()) != null) {
list.remove(listView.getSelectedIndex());
listView.revalidate();
listView.repaint();
}
}
}

Why java.io.NotSerializableException: javax.swing.plaf.metal.MetalFileChooserUI?

I basically want to serialize an ArrayList in Java, and here is the code that apparently needs to be changed. (EDIT: pasted entire class)
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.ArrayList;
import javax.swing.*;
public class GraphEditSerial extends JFrame{
//stores all dots on the MainPanel
private ArrayList<Circle> circles = new ArrayList<Circle>();
class Circle implements Serializable{
private static final long serialVersionUID = -8364830119753788192L;
private int x, y;
public String toString(){
return "("+x+", "+y+")";
}
public Circle(int x, int y) {
this.x = x;
this.y = y;
}
}
//variables for current workmode
private boolean canInsert = false;
private boolean canDelete = false;
private boolean canMove = false;
private boolean wasMoved = false;
//defines a JPanel and adds a MouseListener
class MainPanel extends JPanel implements MouseListener{
//constructor
public MainPanel(){
setBackground(Color.white);
addMouseListener(this);
}
//paints a blue spot on specified location
public void paint(Graphics g) {
super.paint(g);
g.setColor(Color.blue);
for (Circle k: circles) {
g.fillOval(k.x - 5, k.y - 5, 10, 10);
}
}
public void mouseClicked(MouseEvent e) {
//user wants to add a circle
if(canInsert){
//adds new circle to ArrayList and displays all circles
circles.add(new Circle(e.getX(), e.getY()));
repaint();
}
//user wants to delete a circle
else if(canDelete){
//checking if clicked position is within 4px of existing circles
for (int k=0; k<circles.size();k++){
Circle c = circles.get(k);
if(c.x-e.getX()<=4
&&c.x-e.getX()>=-4
&&c.y-e.getY()<=4
&&c.y-e.getY()>=-4){
//removes circle that is within 4 px of clicked position
circles.remove(k);
}
}
repaint();
}
}
//used to move existing circles, but only if current workmode = move
public void mousePressed(MouseEvent e) {
//current workmode has to be "move"
if(canMove==true){
//checking if clicked position is within 4px of existing circles
for (int k=0; k<circles.size();k++){
Circle c = circles.get(k);
if(c.x-e.getX()<=4
&&c.x-e.getX()>=-4
&&c.y-e.getY()<=4
&&c.y-e.getY()>=-4){
//removes circle that is within 4 px of clicked position
circles.remove(k);
wasMoved=true;
}
}
}
}
//displays moved circle at current position of mouse
public void mouseReleased(MouseEvent e) {
//current workmode has to be "move"
if(canMove==true){
//checking if user clicked on an existing circle before
if(wasMoved==true){
circles.add(new Circle(e.getX(), e.getY()));
repaint();
wasMoved=false;
}
}
}
//not assigned
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
}
//Menu
JMenuBar mb = new JMenuBar();
JMenu graph = new JMenu("Graph");
JMenu vertex = new JMenu("Vertex");
JMenuItem open = new JMenuItem("open");
JMenuItem mnew = new JMenuItem("new");
JMenuItem save = new JMenuItem("save");
JMenuItem insert = new JMenuItem("insert");
JMenuItem move = new JMenuItem("move");
JMenuItem delete = new JMenuItem("delete");
JMenuItem none = new JMenuItem("none");
//FileChooser
JFileChooser fc;
//main panel
MainPanel main = new MainPanel();
//bottom row
JPanel bottomrow = new JPanel(new GridLayout(1,2));
JLabel l1 = new JLabel("Selected Action: ", SwingConstants.RIGHT);
JTextField l2 = new JTextField("none", SwingConstants.LEFT);
//setting up a Menu with MenuItems, Dimensions, ActionListeners, etc...
public GraphEditSerial(String s){
super(s);
//adding menu items to menus
graph.add(open);
graph.add(mnew);
graph.add(save);
vertex.add(insert);
vertex.add(move);
vertex.add(delete);
vertex.add(none);
fc = new JFileChooser();
//Label l2 changes accordingly to selected MenuItem
open.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
l2.setText("Graph: open");
canInsert=false; canDelete=false; canMove=false;
repaint();
int returnVal = fc.showOpenDialog(GraphEditSerial.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File f = fc.getSelectedFile();
try{
FileInputStream fis = new FileInputStream(f);
ObjectInputStream ois = new ObjectInputStream(fis);
ArrayList<Circle> a = (ArrayList<Circle>)ois.readObject();
circles = a;
repaint();
}
catch (ClassNotFoundException e) {}
catch (IOException e){}
}
}
});
mnew.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
l2.setText("Graph: new");
canInsert=false; canDelete=false; canMove=false;
//clears all vertexes
circles.clear();
repaint();
}
});
save.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
l2.setText("Graph: save");
canInsert=false; canDelete=false; canMove=false;
repaint();
int returnVal = fc.showSaveDialog(GraphEditSerial.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
String datname = fc.getSelectedFile().getAbsolutePath().toString();
try{
FileOutputStream fos = new FileOutputStream(datname);
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject((ArrayList<Circle>) circles);
oos.close();
}
catch (IOException e){
l2.setText(e.toString());
e.printStackTrace();
}
}
}
});
insert.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
l2.setText("Vertex: insert");
canInsert=true; canDelete=false; canMove=false;
repaint();
}
});
move.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
l2.setText("Vertex: move");
canInsert=false; canDelete=false; canMove=true;
repaint();
}
});
delete.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
l2.setText("Vertex: delete");
canInsert=false; canDelete=true; canMove=false;
repaint();
}
});
none.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
l2.setText("none");
canInsert=false; canDelete=false; canMove=false;
repaint();
}
});
bottomrow.add(l1);
bottomrow.add(l2);
main.setPreferredSize(new Dimension(500,300));
main.setOpaque(true);
main.setBackground(Color.WHITE);
mb.setPreferredSize(new Dimension(500, 20));
mb.add(graph);
mb.add(vertex);
setJMenuBar(mb);
add(main, BorderLayout.CENTER);
add(bottomrow, BorderLayout.PAGE_END);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
pack();
setVisible(true);
setLocationRelativeTo(null);
}
public static void main(String[] arg){
//new GraphEditor("MyGraphEditor");
new GraphEditSerial("MyGraphEditor");
}
}
I did it without the JFileChooser and just specified a filename, and it worked like a charm. I could also deserialize it without problems. But as soon as I use JFileChooser, I get "java.io.NotSerializableException: javax.swing.plaf.metal.MetalFileChooserUI"
Anyone got an idea?
EDIT: this is what e.printStackTrace() prints
java.io.NotSerializableException: javax.swing.plaf.metal.MetalFileChooserUI
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.writeObject(Unknown Source)
at javax.swing.event.EventListenerList.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.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
at javax.swing.JComponent.writeObject(Unknown Source)
at sun.reflect.GeneratedMethodAccessor10.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.defaultWriteObject(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 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.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.writeObject(Unknown Source)
at java.util.ArrayList.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 GraphEditSerial$3.actionPerformed(GraphEditSerial.java:202)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.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.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(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)

Is Circle an inner class of your UI class itself? If it is an inner class and fc is a field of the outer class the writeObject on a Circle element will try to serialize not only its fields but its outer-class's fields too. And if fc is a field of the outer-class and a MetalFileChooserUI then it will obviously fail serialization.
That's the best guess I can come up with from your code snippet. If that doesn't answer your question, as vanza says we would need more information on the content of the Circle

It looks like you are saving some object which has this (anonymous) ActionListener attached, or somehow references an object which in turn references this ActionListener. The ActionListener, in turn references the fc object, which is a JFileChooser. The JFileChooser itself knows its UI object (which does all the work such that the file chooser fits in your system), and this one is not serializable.
There is no point in serializing a JFileChooser. The only interesting data it would contain are the file or directory name, which anyway could be unusable on another system.
An easy solution would be moving the fc inside the actionPerformed method, and initialize it there (creating a new JFileChooser).
But you really want to have a look why your ActionListener (or the object it is attached to) is serialized - this sometimes could be useful, but most probably you don't want your GUI to be serialized at all, only the data. To have some insight, change
catch (IOException e){l2.setText(e.toString());}
to
catch (IOException e){
l2.setText(e.toString());
e.printStackTrace();
}
and look at the stack trace from standard output. It should show you a hint which objects are tried to serialize. It could be that your Circles have a reference to some object which they shouldn't, really. (Or a reference which should be transient. Or that they are objects of an inner class when they should not.)

I just wanted to add some additional information about that problem because I ran over exactly this error (probably because I am a student at the same university with the same lecturer and the exact same task :D).
In this blogpost I analysed this adverse constellation in detail: try to serialize an inner class with an outer class that handles events and uses jfilechooser, which fails:
http://hannes-schurig.de/21/11/2012/java-problem-beim-serialisieren-von-objekten-bei-der-verwendung-von-ereignishandlern-jfilechooser/
It's in german but I think it's easy to get the point, important things are highlighted.