int selRow = myTaskTable.getSelectedRow();

...
myTaskTable.addMouseListener(this);
...
public void mouseClicked(MouseEvent e)
{
 if(e.getModifiers() == MouseEvent.BUTTON1_MASK)
 {
   if(e.getClickCount() == 2)
   {
     e.consume();
     int selRow = myTaskTable.getSelectedRow();
     System.out.println("GridReport double clicked on row="+selRow);
    }
  }
}

final int selectedRowIndex = table.rowAtPoint(mouseEvent.getPoint());
// If the rows are sorted or filtered
final int modelRowIndex = table.convertRowIndexToModel(selectedRowIndex);

public void mouseClicked(MouseEvent e){
 if(e.getModifiers() == MouseEvent.BUTTON1_MASK){
   if(e.getClickCount() == 2){
     int selRow = myTaskTable.getSelectedRow();
     System.out.println("GridReport double clicked on row="+selRow);
     e.consume();
    }
  }
}