jdk/test/java/awt/Window/WindowDeadlockTest/WindowDeadlockTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 8176490
 * @summary Tests that there is no hang or deadlock when the visibility
 *      of parent and child windows is changed.
 * @library ../../regtesthelpers
 * @build Util
 * @run main/timeout=20 WindowDeadlockTest
 */

import java.awt.Dialog;
import java.awt.Frame;
import java.awt.Robot;

import test.java.awt.regtesthelpers.Util;

public class WindowDeadlockTest {
    public static void main(String[] args) throws Exception {
        Robot robot = Util.createRobot();

        Frame main = new Frame("Main");
        main.setBounds(0, 0, 200, 100);
        main.setVisible(true);

        Dialog first = new Dialog(main, "First");
        first.setBounds(250, 0, 200, 100);
        first.setVisible(true);

        Dialog second = new Dialog(first, "Second");
        second.setBounds(0, 150, 200, 100);
        second.setVisible(true);

        Util.waitForIdle(robot);
        robot.delay(2000);

        Dialog third = new Dialog(first, "Third", false);
        third.setBounds(250, 150, 200, 100);
        third.setVisible(true);
        first.setVisible(false); // the hang takes place here

        Util.waitForIdle(robot);
        robot.delay(2000);

        third.dispose();
        second.dispose();
        first.dispose();
        main.dispose();
    }
}