Multi threading race condition in JTable while rendering and truncating?

Question

Hi All,
It seems that there is a race confition when rendering a large table which is truckated by another thread while rendering it on a JTable view.
Let me try to explain what I think is the problem:
When considering the folowing code from BasicTableUI
First the size of the tbale model is determined in
public void paint(Graphics g, JComponent c) {
[snip]
        if (rMax == -1) {
         rMax = table.getRowCount()-1;
        }then this cMax is passed to:
private void paintCells(Graphics g, int rMin, int rMax, int cMin, int cMax) {
     JTableHeader header = table.getTableHeader();
     TableColumn draggedColumn = (header == null) ? null : header.getDraggedColumn();
     TableColumnModel cm = table.getColumnModel();
     int columnMargin = cm.getColumnMargin();
        Rectangle cellRect;
     TableColumn aColumn;
     int columnWidth;
     if (table.getComponentOrientation().isLeftToRight()) {
         for(int row = rMin; row <= rMax; row++) {
          cellRect = table.getCellRect(row, cMin, false);
                for(int column = cMin; column <= cMax; column++) {
                    aColumn = cm.getColumn(column);
                    columnWidth = aColumn.getWidth();
                    cellRect.width = columnWidth - columnMargin;
                    if (aColumn != draggedColumn) {
                        paintCell(g, cellRect, row, column);
                    cellRect.x += columnWidth;
     } else {The prepareRenderer works like this:
    public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
        Object value = getValueAt(row, column);
[snip]
     return renderer.getTableCellRendererComponent(this, value,
                                                   isSelected, hasFocus,
                                                   row, column);
    }Here the above getValueAt is called for every cell to be rendered (in one thread) , while async a row can be deleted (in another thread) while the tables rendereing is still in progress. This leads to a value to be unexpectedly be null in the above return renderer.getTableCellRendererComponent method call: this method could return an empty panel to indicated that the cell is gone which is strange behaviour because the row doesn't exists anymore. The other option would be to return a null renderer so that the cell won't be rendered but that is impossible because the code doens't expect a null renderer. The third option could to be synchronize somehow the 2 threads so that any delete on the model has to wait until the rendering has finished.
A possble solution could be to make paintCells at least protected and change to code to see if the designated row still exists, and if not don't increment the row height
Any help/feedback is greatly appreciated!
Note that this question is based upon Java5 and I do not know if this is also true for Java6
Thnx
Andr'e

Answer 1

So this means that a TableModel must be manupulated (setValueAt , adding deleting and/or updating objects in this TableModel) through a thread in the EventQueue!
i.e. (pseudo code)
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                getTableModel().setValueAt(........)
        });A