RMI - zwracanie ArrayListy obiektów.

0

Witam,

Mój problem jest następujący:

Mam funkcję, która zwraca ArrayListe obiektów typu jTable, których klasa wygląda tak:

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.util.ArrayList;
import javax.swing.ImageIcon;


public class jTable extends javax.swing.JFrame {

    int TableSize;
    int TableID;
    int PlayerCount = 0;
    int Seats = 0;


    Image tlo;
    String TableName;
    


    Player [] PlayersOnTableList = new Player[100];

    public jTable(int TableID) {

        this.TableID = TableID;
        this.setVisible(true);
        setPreferredSize(new Dimension(794,547));
        initComponents();

        setTitle("JavPox - tableID: "+TableID);
        tlo = new ImageIcon(this.getClass().getResource("table.jpg")).getImage();
        repaint();
      
    }

    public void AddPlayer(int PlayerID){

         System.out.println("PlayerID = " + PlayerID);
  
switch(Seats){
        case 0: this.label1.setText(PlayersOnTableList[PlayerID].Nick); Seats++; break;
        case 1: this.label2.setText(PlayersOnTableList[PlayerID].Nick); Seats++; break;
        case 2: this.label3.setText(PlayersOnTableList[PlayerID].Nick); Seats++; break;
        case 3: this.label4.setText(PlayersOnTableList[PlayerID].Nick); Seats++; break;
        case 4: this.label5.setText(PlayersOnTableList[PlayerID].Nick); Seats++; break;
        case 5: this.label6.setText(PlayersOnTableList[PlayerID].Nick); Seats++; break;
        case 6: break;

    }
    
}

public void paint(Graphics g)
    {
        Graphics2D g2 = (Graphics2D)g;
        g2.drawImage(tlo,0, 0, null);
        repaint();
    }
  
    @SuppressWarnings("unchecked")
  
    private void initComponents() {

        label1 = new java.awt.Label();
        label2 = new java.awt.Label();
        label3 = new java.awt.Label();
        label4 = new java.awt.Label();
        label5 = new java.awt.Label();
        label6 = new java.awt.Label();
        label7 = new java.awt.Label();
        label8 = new java.awt.Label();
        label9 = new java.awt.Label();
        label10 = new java.awt.Label();

        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
        setResizable(false);
        getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());

        label1.setAlignment(java.awt.Label.CENTER);
        label1.setText("Empty Seat");
        getContentPane().add(label1, new org.netbeans.lib.awtextra.AbsoluteConstraints(380, 390, -1, -1));

        label2.setAlignment(java.awt.Label.CENTER);
        label2.setText("Empty Seat");
        getContentPane().add(label2, new org.netbeans.lib.awtextra.AbsoluteConstraints(46, 302, -1, -1));

        label3.setAlignment(java.awt.Label.CENTER);
        label3.setText("Empty Seat");
        getContentPane().add(label3, new org.netbeans.lib.awtextra.AbsoluteConstraints(46, 106, -1, -1));

        label4.setAlignment(java.awt.Label.CENTER);
        label4.setText("Empty Seat");
        getContentPane().add(label4, new org.netbeans.lib.awtextra.AbsoluteConstraints(380, 50, -1, -1));

        label5.setAlignment(java.awt.Label.CENTER);
        label5.setText("Empty Seat");
        getContentPane().add(label5, new org.netbeans.lib.awtextra.AbsoluteConstraints(690, 110, -1, -1));

        label6.setAlignment(java.awt.Label.CENTER);
        label6.setText("Empty Seat");
        getContentPane().add(label6, new org.netbeans.lib.awtextra.AbsoluteConstraints(690, 300, -1, -1));

        label7.setAlignment(java.awt.Label.CENTER);
        label7.setText("Empty Seat");
        getContentPane().add(label7, new org.netbeans.lib.awtextra.AbsoluteConstraints(190, 390, -1, -1));

        label8.setAlignment(java.awt.Label.CENTER);
        label8.setText("Empty Seat");
        getContentPane().add(label8, new org.netbeans.lib.awtextra.AbsoluteConstraints(190, 50, -1, -1));

        label9.setAlignment(java.awt.Label.CENTER);
        label9.setText("Empty Seat");
        getContentPane().add(label9, new org.netbeans.lib.awtextra.AbsoluteConstraints(570, 50, -1, -1));

        label10.setAlignment(java.awt.Label.CENTER);
        label10.setText("Empty Seat");
        getContentPane().add(label10, new org.netbeans.lib.awtextra.AbsoluteConstraints(560, 390, -1, -1));

        pack();
    }

    
    
    private java.awt.Label label1;
    private java.awt.Label label10;
    private java.awt.Label label2;
    private java.awt.Label label3;
    private java.awt.Label label4;
    private java.awt.Label label5;
    private java.awt.Label label6;
    private java.awt.Label label7;
    private java.awt.Label label8;
    private java.awt.Label label9;
   

}

Funkcja na serwerze wygląda następująco:

 public ArrayList RefreshTableList() throws RemoteException {
        return TableList;
      }

Przy czym TableList to ArrayLista obiektów typu jTable.

Funkcja, która wywołuje zdalnie powyższą metodę:

public void RefreshTableList(){

         ArrayList<jTable> TableListToList = new ArrayList<jTable>();
            

            try{

                PokerInterface Server = (PokerInterface)Naming.lookup("Server");
                     TableListToList = Server.RefreshTableList();


} catch (NotBoundException ex) {
            Logger.getLogger(MainLobby.class.getName()).log(Level.SEVERE, null, ex);
        } catch (MalformedURLException ex) {
            Logger.getLogger(MainLobby.class.getName()).log(Level.SEVERE, null, ex);
        } catch (RemoteException ex) {
            Logger.getLogger(MainLobby.class.getName()).log(Level.SEVERE, null, ex);
        }


    } 

Jeśli TableList jest pusty, funkcja działa, tj. zwraca faktycznie pusty ArrayTable. Jeśli jednak znajdują się w niej jakieś elementy, otrzymuję wyjątek:

2011-03-31 16:51:10 MainLobby RefreshTableList
SEVERE: null
java.rmi.UnmarshalException: error unmarshalling return; nested exception is: 
        java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: sun.awt.image.ToolkitImage
        at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:173)
        at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:178)
        at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:132)
        at $Proxy0.RefreshTableList(Unknown Source)
        at MainLobby.RefreshTableList(MainLobby.java:332)
        at MainLobby.jButton6ActionPerformed(MainLobby.java:426)
        at MainLobby.access$300(MainLobby.java:15)
        at MainLobby$4.actionPerformed(MainLobby.java:152)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
        at java.awt.Component.processMouseEvent(Component.java:6289)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
        at java.awt.Component.processEvent(Component.java:6054)
        at java.awt.Container.processEvent(Container.java:2041)
        at java.awt.Component.dispatchEventImpl(Component.java:4652)
        at java.awt.Container.dispatchEventImpl(Container.java:2099)
        at java.awt.Component.dispatchEvent(Component.java:4482)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
        at java.awt.Container.dispatchEventImpl(Container.java:2085)
        at java.awt.Window.dispatchEventImpl(Window.java:2478)
        at java.awt.Component.dispatchEvent(Component.java:4482)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:644)
        at java.awt.EventQueue.access$000(EventQueue.java:85)
        at java.awt.EventQueue$1.run(EventQueue.java:603)
        at java.awt.EventQueue$1.run(EventQueue.java:601)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
        at java.awt.EventQueue$2.run(EventQueue.java:617)
        at java.awt.EventQueue$2.run(EventQueue.java:615)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:614)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: sun.awt.image.ToolkitImage
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1332)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
        at java.util.ArrayList.readObject(ArrayList.java:593)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1848)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
        at sun.rmi.server.UnicastRef.unmarshalValue(UnicastRef.java:306)
        at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:155)
        ... 43 more
Caused by: java.io.NotSerializableException: sun.awt.image.ToolkitImage
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1164)
        at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
        at java.util.ArrayList.writeObject(ArrayList.java:570)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
        at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)
        at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
        at sun.rmi.server.UnicastRef.marshalValue(UnicastRef.java:274)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:315)
        at sun.rmi.transport.Transport$1.run(Transport.java:159)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662) 

Dodam, że mam drugą funkcję, zwracająca ArrayTable Stringów, i ona działa poprawnie.
Z góry dziękuję za jakiekolwiek wskazówki.

0

Klasa musi implementować interfejs Serializable. String implementuje, Twoja klasa jtable nie.

0

A coś więcej na ten temat?

public class jTable extends javax.swing.JFrame implements Serializable{ (...)

Nic nie zmienia.

0

Zrób sobie osobne obiekty z danymi, zamiast serializować JFrame. Zapewne z obiektu klasy JFrame da się osiągnąć obiekt typu ToolkitImage (albo ty gdzieś taki obiekt dołożyłeś), a on nie jest serializowalny. Pamiętaj, że przy serializacji serializuje się cały graf osiągalnych obiektów, tzn jeśli serializujesz obiekt A, a obiekt a posiada referencje do obiektów B, C, D to te obiekty muszą być zserializowane razem z nim. Proces jest rekurencyjny, a więc jeśli B ma referencje do obiektów E, F, G to te obiekty też muszą być serializowane przy serializowaniu obiektu A. Słówko kluczowe transient zapobiega serializacji pola, ale tobie raczej nie pomoże tutaj, bo winne jest pole, które jest w innej klasie (np w klasie wyżej w hierarchii czyli JFrame).

Serializacja komponentów Swingowych to wg mnie zły pomysł.

0

j/w zwracanie przez serwer obiektów swingowych to raczej bardzo zły pomysł. Reprezentacja danych powinna być oddzielona od nich samych.

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