While working on some other bug, i found a few memory leaks which may cause the application crash because of not enough of memory:

Test to reproduce, you need to wait hour or so, depends from the system:

import java.awt.Color;
import java.awt.Frame;
import java.awt.Point;
import java.awt.Robot;
import java.util.List;

/**
 * @test
 * @key headful
 * @bug 8215105
 * @summary tests that Robot can capture the common colors without
 *         artifacts
 */
public final class CheckCommonColors {

    private static final Frame frame = new Frame();
    private static Robot robot;

    public static void main(final String[] args) throws Exception {
        robot = new Robot();
        try {
            test();
        } finally {
            frame.dispose();
        }
    }

    private static void test() {
        frame.setSize(400, 400);
        frame.setLocationRelativeTo(null);
        frame.setUndecorated(true);
        while (true)
            for (final Color color : List.of(Color.WHITE, Color.LIGHT_GRAY,
                                             Color.GRAY, Color.DARK_GRAY,
                                             Color.BLACK, Color.RED, Color.PINK,
                                             Color.ORANGE, Color.YELLOW,
                                             Color.GREEN, Color.MAGENTA,
                                             Color.CYAN, Color.BLUE)) {
                frame.dispose();
                frame.setBackground(color);
                frame.setVisible(true);
                checkPixels(color);
            }
    }

    private static void checkPixels(final Color color) {
        int attempt = 0;
        Point p = frame.getLocationOnScreen();
        Color pixel = robot.getPixelColor(p.x + frame.getWidth() / 2,
                                          p.y + frame.getHeight() / 2);
        if (color.equals(pixel)) {
            return;
        }
    }
}