JTable / ObjectInputStream

Question

Hey, guys.
For some reason my JTable isn't updating properly. This is how things are supposed to work.
The client sends a request to the server. The server queries the database, and then sends the result, as a vector, to the client. I have a JTable, that updates itself everytime the appropriate TAB is chosen. Now, the first time I click on the tab, the JTable shows me exactly what is in that table in the database. Then I make a change to the table in the database, choose the TAB again, but the table isn't updated. It is definitely updated in the database as I have checked that.
This is what the server does:
er.getItemsFromDB();
Vector <EmailInfo> itemsList = er.getItemsList();
try {
        objectoutputstream.writeObject(itemsList);
        objectoutputstream.flush();
catch (Exception e){
        e.printStackTrace();
}the receive is implemented as so:
    protected Object receiveObject(){
        Object obj = new Object();
        try {
            obj = objectinputstream.readObject();
        catch(Exception e){
            e.printStackTrace();
        return obj;
    }And the app does the following:
Vector <EmailInfo> itemsList = (Vector <EmailInfo>) socket.receiveObject(); Now, it definitely works the first time I run the program. And so far, I know that the server queries the database perfectly everytime, and it sends out the changed data. But for some reason, when I readObject(), it seems to read in the old data the second time I use the readObject method.
Anyone know what I'm doing wrong. Let me know if you need to see more code.
Thanks.
...DJVege...

Answer 1

I'll try and show you the process:
private void refreshItemTable(){
        MyTableModel itemTableModel = new MyTableModel(itemColumnNames, getItemData());calls getItemData()
private Object[][] getItemData(){
        socket.send(socket.GETITEMSFROMDB);
        Vector <EmailInfo> itemsList = (Vector <EmailInfo>) socket.receiveObject();
        Object[][] rdata = new String[itemsList.size()][7];
        for (int i = 0; i < itemsList.size(); i++){
            EmailInfo item = (EmailInfo)itemsList.get(i);
            rdata[0] = item.getArtikelID();
rdata[i][1] = item.getArtikelName();
rdata[i][2] = item.getArtikelFarbe();
rdata[i][3] = "�" + item.getPreis();
rdata[i][4] = "�" + item.getVersicherterVersand();
rdata[i][5] = "�" + item.getExtraCost();
rdata[i][6] = String.valueOf(item.getStock());
return rdata;
calls socket.receiveObject():
protected Object receiveObject(){
        Object obj = new Object();
        try {
            obj = objectinputstream.readObject();
        catch(Exception e){
            e.printStackTrace();
        return obj;
    } This is what the server does to send:
else if (command.equals(GETITEMSFROMDB)){
                        er.getItemsFromDB();
                        Vector <EmailInfo> itemsList = er.getItemsList();
                        System.out.println(itemsList.get(0).getArtikelFarbe());
                        try {
                            objectoutputstream.writeObject(itemsList);
                            objectoutputstream.flush();
                        catch (Exception e){
                            e.printStackTrace();
                    }calls getItemsFromDB():
public void getItemsFromDB(){
        itemsList.removeAllElements();
        try {
            conn = createConnectionToDB();
            Statement st = conn.createStatement();
            ResultSet rset;
            EmailInfo data;   
            st.execute("select * from Artikels order by artikelID");
            rset = st.getResultSet();
            while (rset.next()){
                data = new EmailInfo();
                data.setArtikelID(rset.getString(1));
                data.setArtikelName(rset.getString(2));
                data.setArtikelFarbe(rset.getString(3));
                data.setPreis(rset.getString(4));
                data.setVersicherterVersand(rset.getString(5));
                data.setExtraCost(rset.getString(6));
                data.setStock(Integer.parseInt(rset.getString(7)));
                itemsList.add(data);
            conn.close();
            //System.out.println("Closed Database Connection");
        catch (Exception e){
            e.printStackTrace();
             try {
                conn.close();
                //System.out.println("Closed Database Connection");
            catch (SQLException ex){
                //System.out.println("Can't close database");
                System.exit(0);
    }Then the server calls getItemsList():
public Vector <EmailInfo> getItemsList(){
        return ItemsList;
    }where itemsList is set as a class variable above:
private Vector <EmailInfo> itemsList = new Vector <EmailInfo> (3, 10);Does that help at all?
Regards.
...DJVege...