Windows 7 Professional 64
Lenovo T410 laptop

Java(TM) SE Runtime Environment (build 1.6.0_23-b05)
Java HotSpot(TM) Client VM (build 19.0-b09, mixed mode, sharing)

Next code does not select the last char:

        JFrame frm = new JFrame();
        frm.getContentPane().add(new JTextField("some text"));
        frm.setSize(200, 200);
        frm.setVisible(true);
        new Thread(new Runnable() {
            public void run() {
                try {
                    try {
                        Thread.sleep(6000);
                    } catch (InterruptedException ex) {
                    }
                    Robot robot = new Robot();
                    robot.keyPress(java.awt.event.KeyEvent.VK_END);
                    robot.keyRelease(java.awt.event.KeyEvent.VK_END);
                    robot.keyPress(java.awt.event.KeyEvent.VK_SHIFT);
                    robot.keyPress(java.awt.event.KeyEvent.VK_LEFT);
                    robot.keyRelease(java.awt.event.KeyEvent.VK_LEFT);
                    robot.keyRelease(java.awt.event.KeyEvent.VK_SHIFT);
                } catch (AWTException ex) {
                    ex.printStackTrace();
                }
            }
        }).start();

Works fine on linux and windows versions other than 7.