Synchronize complex TableModel methods help required

Hello everyone,
I am working on a Client/Server Swing application that holds rapidly changing data displayed and manipulated via a JTable(On the client side of course). The server manages a couple hundred simultaneous client connections all working on the same data. All clients are being updated constantly when any data changes (initiated by any users). My table model uses a ArrayList to hold the data row Objects (Object[] to be precise). My TableModel holds all the methods to manipulate the Table content ArrayList, this mean that two different methods often access the same Object simultaneously (update one row and delete an other row in my Table content ArrayList for example). Therefore my ArrayList should be synchronized. But when I try to synchronize my ArrayList like this:
List rvContent = Collections.synchronizedList((ArrayList) in.readObject());
I have to cast my List as an ArrayList every time I need to use it, and even then somehow the application doesn't work anymore.
I was thinking that maybe I could synchronize access to some methods contained in my TableModel, but then how do I synchronize multiple methods in a way that if one method is beeing accessed, all other access request to other synchronized methods within that class are being cued as well?
Fact is that so far, when a lot of data is being manipulated, the client application tends to throw nullPointerExceptions (index out of bound for instance) ex: when a thread deletes one row while another one is calling a fireTableCellUpdated() on the same row.
So I hope I could explain my dilemma clearly enough, despite of my bad English.
Could any expert give me some quality help please on how to manage this kind of task, I am out of resources.
Thanks a lot to this great comunity

mdundek, It is very important to know EXACTLY what you are doing when you mess with Threads in a Swing Application. Always follow the following rule --> NEVER CAUSE AN UPDATE BE MADE TO A SWING VISUAL COMPONENT OUTSIDE OF THE AWT-EVENT DISPATCH THREAD. Simple.
I have a huge amount of experience doing exactly what you are trying to do - I'll assume that your clients are RMI-based and that the server is calling a "callback" object. The best way of doing this is to have an AsyncReceiver object, a Controller object and an AsyncUpdate object.
Controller: The purpose of the controller is to update your Swing Data Models but NOT to cause the GUI Components to update (ie. do not fireTableDataChanged() or whatever).
AsyncReceiver: When your (Remote) client receives the callback it passes it along to the async-receiver. The async-receiver uses SwingUtilities.invokeLater() to tell the Controller to update the data models, which will then be updated in the AWT Event-Dispatch Thread.
AsyncUpdate: use the javax.swing.Timer class to periodically update your screen (ie. call fireTableDataChanged() or whatever on your Swing data models). The reason for this is that it is a throttle on the paint() method, which is very expensive. If your GUI receives many updates per second, then calling a fireDataChanged() each time can considerably slow the GUI down. Instead update the data models separately, say every half-second. This is usually plenty.
Other tips are to cache exactly which Table cells have been changed between the half-second updates, and tell the table to only re-paint those cells. When we implemented this in our app, CVPU usage dropped by a factor of about 5.
Anyway, the point is - be very wary about creating explicitly your own Threads within a GUI. This should be done ONLY when you want to execute an expensive piece of work without "freezing" the GUI (in which case you should use the SwingWorker construct (http://java.sun.com/products/jfc/tsc/articles/threads/threads2.html). When you update the GUI, always cause the update to be made in the AWT Event-Dispatch thread through use of the SwingUtilities class./**
* THE AsyncReceiver
public class AsyncReceiver {
  private Controller controller_;
  public void remoteCallback(final EventObject e) {
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        controller_.update(e);
* NOW FOR THE AsyncUpdate
public class AsyncUpdate {
  private MyApplication app_;
  public void startAsyncUpdates() {
    //Redraw every 500 millis
    Timer t =
      new Timer(
        500,
        new ActionListener() {
          public void actionPerformed() {
            app_.causeScreenToRedraw();
    t.start();
}

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    Creative Audio Consul ? setting as per instructions, however have tried variations in vain. (Note: above tabs there is a select device box with SB Audigy [A0000] in it ? only option. Just wondering what [A0000] means?)
    Your advice please. A simple step by step guide would be appreciated, many thanks in advance, Jon

    "My computer has been recently upgraded at my local computer shop and all programs re-installed (including driver update from Creative's website). "
    Do you have the original installation disk?
    If so, try installing THOSE drivers, ESPECIALLY if it worked before. Be sure to uninstall what is there now, first.
    Its natural for most people to want the 'latest' drivers for their hardware. However:
    After experiencing some difficulties with some CL 'updates' for certain products, I now avoid them UNLESS I am having a PROBLEM with the existing drivers.

  • Help required...very urgent !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    Help required with an error message.
    "Table Z0CL_BATCLA for object class CHARGE does not exist"

    Hi
    It means your Z0CL_BATCLA is not assigned to object CHARGE, you have to create the linke between object and table in the table TCDOB.
    You can do it by trx SCDO, but in this case you have to change in standard object.
    Max

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