ADDITIONAL SYSTEM INFORMATION :
Windows 10 - 1709


A DESCRIPTION OF THE PROBLEM :
JDK-8196030 (https://bugs.openjdk.java.net/browse/JDK-8196030?attachmentOrder=desc) contains in the first comment that the ticket does not affect Java 8. Unfortunately, that is not true. Running the SimpleAWTRobotTest.java (found in the original ticket) on some Windows 10 - 1709 systems fail, because the Robot.mouseMove() moves the mouse to the wrong part of the screen.

Failing systems need to be 1080p with a 15" or less monitor. Even with the display scaling set to 100%, the AWT Robot still moves the wrong coordinates.

I've seen it fail at 1080p 100% scale on a 13" laptop and a 15" laptop, but pass on a 65" screen. It seems Windows is "compensating" for the smaller screen and Java is not handling it. It seem to work reliably under Linux.

See discussion of the problem affecting AssertJ Swing here: https://github.com/joel-costigliola/assertj-swing/issues/235

This ticket is a request to backport JDK-8196030 to Java 8.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
See attached test (lifted verbatim from ORC-8196030).

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Move the mouse to the correct part of the screen.
ACTUAL -
Moves the mouse to the wrong part of the screen.

---------- BEGIN SOURCE ----------
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Robot;
import java.awt.event.InputEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

/**
 * Simple standalone AWT robot test.
 */
public class SimpleAWTRobotTest {

    private boolean clicked = false;

    public void initGUI() {
        JFrame frame = new JFrame("Simple AWT Robot Test");
        frame.setLayout(new BorderLayout());
        frame.setUndecorated(true);
        frame.setLocation(300, 300);

        JPanel panel = new JPanel();
        panel.setLayout(new BorderLayout());
        panel.setPreferredSize(new Dimension(100, 100));
        frame.add(panel);

        JButton button = new JButton("Click me");
        button.addActionListener(e -> clicked = true);
        panel.add(button, BorderLayout.CENTER);

        frame.pack();
        frame.setVisible(true);
    }

    public void test() throws Exception {
        final Robot robot = new Robot();

        SwingUtilities.invokeAndWait(() -> {
            this.initGUI();
        });
        SwingUtilities.invokeAndWait(() -> {
            //robot.mouseMove(0, 0);
            robot.mouseMove(350, 350);
        });
        Thread.sleep(500);
        SwingUtilities.invokeAndWait(() -> {
            robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
        });
        Thread.sleep(500);
        SwingUtilities.invokeAndWait(() -> {
            robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
        });
        Thread.sleep(500);
        if (clicked) {
            System.out.println("PASSED");
        } else {
            System.out.println("*** FAILED");
        }
        System.exit(0);
    }

    public static void main(String[] args) throws Exception {
        new SimpleAWTRobotTest().test();
    }
    
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Use Java 11

FREQUENCY : always