跳到下一行时无法突出显示Jtable中的下一个可编辑单元格

Question

Below is my custom logic to tab to the next editable cell. Adds row automatically when tabbed from a particular column.

What works fine:

When new row is added focus is automatically on the first row of next column so that when i start typing it types from first column of next row.

What i need :

Highlight the cell in focus so that the user knows that the focus is on first column of next row. At the moment although it types correctly into the cell we dont know visibly that it is pointing to that cell.

Note :

I have done this table.cellSelectionEnabled(true); and still doesnt work.

InputMap im = itemTable.getInputMap(JTable.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
KeyStroke tab = KeyStroke.getKeyStroke(KeyEvent.VK_TAB, 0);
final Action oldTabAction = itemTable.getActionMap().get(im.get(tab));
Action tabAction = new AbstractAction()
{
    public void actionPerformed(ActionEvent e)
    {
        oldTabAction.actionPerformed( e );
        JTable table = (JTable)e.getSource();
        int rowCount = table.getRowCount();
        int columnCount = table.getColumnCount();
        int row = table.getSelectedRow();
        int column = table.getSelectedColumn();
        FLItemRuleInfo itemRuleInfo = itemTableModel.getItemRuleInfoList().get(row);

        while (! itemTableModel.isCellEditable(row, column) )
        {

            if((itemRuleInfo.getItem()==null || itemRuleInfo.getItem().getItemId()==null || itemRuleInfo.getItem().getItemId().isEmpty())){
                column=1;
                break;
            }
            column += 1;
            if (column == columnCount)
            {
                column = 1;
                row +=1;
            }
           /* if (row == rowCount)
            {
                row = 0;
            }*/
            if (row == table.getSelectedRow()
            &&  column == table.getSelectedColumn())
            {
                break;
            }
        }


        table.changeSelection(row, column, false, false);
        if(column==8 && (row == rowCount-1) && itemRuleInfo.getItem()!=null){
            itemTableModel.addRow(new FLItemRuleInfo());

        }                       

    }
};
itemTable.getActionMap().put(im.get(tab), tabAction);

Answer 1

The getValueAt was returning null for a particular case and i changed null to an empty String "". This resolved the issue.