diff --git a/test/jdk/java/awt/Dialog/DialogDeadlockTest.java b/test/jdk/java/awt/Dialog/DialogDeadlockTest.java
new file mode 100644
index 00000000000..87a929053c7
--- /dev/null
+++ b/test/jdk/java/awt/Dialog/DialogDeadlockTest.java
@@ -0,0 +1,129 @@
+/*
+ * Copyright (c) 2004, 2023, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+  @test
+  @bug 5006427
+  @summary Shows many modal dialog and checks if there is a deadlock or thread race.
+  @key headful
+  @run main DialogDeadlockTest
+*/
+
+import java.awt.BorderLayout;
+import java.awt.Button;
+import java.awt.Dialog;
+import java.awt.EventQueue;
+import java.awt.Frame;
+import java.awt.Window;
+import java.lang.reflect.InvocationTargetException;
+import java.util.LinkedList;
+import java.util.List;
+
+public class DialogDeadlockTest {
+    public static final int MAX_COUNT = 200;
+    private static Dialog lastDialog;
+    private static Runnable r;
+    private static volatile int count;
+    private static volatile int cumul;
+
+    public static void main(String[] args) throws InterruptedException,
+            InvocationTargetException {
+        DialogDeadlockTest ddt = new DialogDeadlockTest();
+        ddt.start();
+    }
+
+    public void start() {
+        final Frame frame = new Frame("abc");
+        final List<Window> toDispose = new LinkedList<>();
+
+        try {
+            frame.setLocation(300, 0);
+            frame.add(new Button("def"));
+            frame.pack();
+            frame.setVisible(true);
+            cumul = 0;
+
+            r = new Runnable() {
+                public void run() {
+                    count++;
+                    if (count < 10) {
+                        Dialog xlastDialog = lastDialog;
+                        cumul += count;
+                        Dialog d = new Dialog(frame, "Dialog "
+                                + cumul, true);
+                        d.setLayout(new BorderLayout());
+                        d.add(new Button("button " + count), BorderLayout.CENTER);
+                        d.pack();
+                        toDispose.add(d);
+                        lastDialog = d;
+                        EventQueue.invokeLater(r);
+                        d.setVisible(true);
+                        if (xlastDialog != null) {
+                            xlastDialog.setVisible(false);
+                        } else {
+                            if (cumul < MAX_COUNT) {
+                                count = 0;
+                                lastDialog = null;
+                                EventQueue.invokeLater(r);
+                            }
+                        }
+                    } else {
+                        try {
+                            Thread.sleep(1000);
+                        } catch (InterruptedException ignore) {
+                        }
+                        lastDialog.setVisible(false);
+                        lastDialog = null;
+                    }
+                }
+            };
+            try {
+                EventQueue.invokeAndWait(r);
+            } catch (InterruptedException ignore) {
+            } catch (Exception e) {
+                throw new RuntimeException("Unexpected exception: "
+                        + e.getLocalizedMessage());
+            }
+            while (cumul < MAX_COUNT - 1) {
+                try {
+                    Thread.sleep(1000);
+                } catch (InterruptedException ignore) {}
+            }
+            System.out.println("Test PASSED");
+        } finally {
+            try {
+                EventQueue.invokeAndWait(() -> {
+                    frame.setVisible(false);
+                    frame.dispose();
+                    for (Window w: toDispose) {
+                        w.dispose();
+                    }
+                });
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            } catch (InvocationTargetException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+}
diff --git a/test/jdk/java/awt/Dialog/DialogLocationTest.java b/test/jdk/java/awt/Dialog/DialogLocationTest.java
new file mode 100644
index 00000000000..b5f21780a40
--- /dev/null
+++ b/test/jdk/java/awt/Dialog/DialogLocationTest.java
@@ -0,0 +1,182 @@
+/*
+ * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+  @test
+  @bug 4101437
+  @summary Dialog.setLocation(int,int) works unstable when the dialog is visible
+  @key headful
+  @run main DialogLocationTest
+*/
+
+import java.awt.AWTException;
+import java.awt.Container;
+import java.awt.Dialog;
+import java.awt.EventQueue;
+import java.awt.Frame;
+import java.awt.GraphicsEnvironment;
+import java.awt.Panel;
+import java.awt.Point;
+import java.awt.Rectangle;
+import java.awt.Robot;
+import java.awt.event.ComponentAdapter;
+import java.awt.event.ComponentEvent;
+import java.lang.reflect.InvocationTargetException;
+import java.util.Random;
+
+public class DialogLocationTest extends Panel {
+    private volatile int count = 0;
+    private Dialog my_dialog;
+    private volatile boolean waitingForEvent = false;
+    private volatile int newX, newY;
+    Random random = new Random();
+
+    public void init() {
+        Container f = getParent();
+
+        while (!(f instanceof Frame)) {
+            f = f.getParent();
+        }
+
+        my_dialog = new Dialog((Frame) f, "TestDialog");
+        my_dialog.setSize(150, 100);
+
+        setSize(200, 200);
+    }
+
+    public void start() throws InterruptedException,
+            InvocationTargetException {
+        Robot robot;
+        try {
+            robot = new Robot();
+            EventQueue.invokeAndWait(() -> {
+                my_dialog.setLocationRelativeTo(null);
+                my_dialog.setVisible(true);
+            });
+            robot.waitForIdle();
+            robot.delay(1000);
+            my_dialog.addComponentListener(new CL());
+            setDialogLocation(my_dialog);
+        } catch (AWTException e) {
+            throw new RuntimeException(e);
+        } finally {
+            EventQueue.invokeAndWait(() -> {
+                my_dialog.setVisible(false);
+                my_dialog.dispose();
+            });
+        }
+    }
+
+    public void setDialogLocation(Dialog dialog) {
+        int height, width, insetX, insetY;
+        Point curLoc;
+        int i;
+
+        Rectangle screen = GraphicsEnvironment
+                .getLocalGraphicsEnvironment()
+                .getMaximumWindowBounds();
+        height = screen.height;
+        width = screen.width;
+        insetX = screen.x;
+        insetY = screen.y;
+
+        String message = "Failed on iteration %d expect:[%d,%d] "
+                + "reported:[%d,%d] diff:[%d,%d]";
+
+        for (i = 0; i < 100; i++) {
+            newX = random.nextInt(insetX, width - 300);
+            newY = random.nextInt(insetY, height - 400);
+
+            if (newX == 0 && newY == 0) {
+                i--;
+                continue;
+            }
+
+            waitingForEvent = true;
+
+            EventQueue.invokeLater(() -> {
+                dialog.setLocation(newX, newY);
+            });
+
+            while (waitingForEvent) {
+                Thread.yield();
+            }
+
+            curLoc = dialog.getLocation();
+            if (curLoc.x != newX || curLoc.y != newY) {
+                count++;
+                System.out.println(message.formatted(i, newX, newY,
+                        curLoc.x, curLoc.y, curLoc.x - newX, curLoc.y - newY));
+                System.out.flush();
+            }
+        }
+
+        if (count > 0) {
+            throw new RuntimeException("Dialog Location was set incorrectly");
+        }
+    }
+
+    public class CL extends ComponentAdapter {
+        int lastX, lastY;
+        String message = "Failed in componentMoved() expect:[%d,%d]"
+                + " reported: [%d,%d] diff [%d,%d]";
+
+        public void componentMoved(ComponentEvent e) {
+            if (e.getComponent() == my_dialog) {
+                Point eventLoc = e.getComponent().getLocation();
+                if (lastX != eventLoc.x || lastY != eventLoc.y) {
+                    lastX = eventLoc.x;
+                    lastY = eventLoc.y;
+                    if (newX != 0 && newY != 0 && (eventLoc.x != newX || eventLoc.y != newY)) {
+                        count++;
+                        System.out.println(message.formatted(newX, newY,
+                                eventLoc.x, eventLoc.y,
+                                eventLoc.x - newX, eventLoc.y - newY));
+                        System.out.flush();
+                    }
+                    waitingForEvent = false;
+                }
+            }
+        }
+    }
+
+    public static void main(String[] args) throws InterruptedException,
+            InvocationTargetException {
+        Frame frame = new Frame("DialogLocationTest");
+        try {
+            DialogLocationTest test = new DialogLocationTest();
+            EventQueue.invokeAndWait(() -> {
+                frame.add(test);
+                test.init();
+                frame.setVisible(true);
+            });
+            test.start();
+        } finally {
+            EventQueue.invokeLater(() -> {
+                frame.setVisible(false);
+                frame.dispose();
+            });
+        }
+    }
+}
+
diff --git a/test/jdk/java/awt/Dialog/ModalDialogOnNonEdt.java b/test/jdk/java/awt/Dialog/ModalDialogOnNonEdt.java
new file mode 100644
index 00000000000..a7a9565d054
--- /dev/null
+++ b/test/jdk/java/awt/Dialog/ModalDialogOnNonEdt.java
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2002, 2023, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+  @test
+  @bug 4636311 4645035
+  @summary Modal dialog shown on EDT after modal dialog on EDT doesn't receive mouse events
+  @key headful
+  @run main ModalDialogOnNonEdt
+*/
+
+import java.awt.Dialog;
+import java.awt.Frame;
+import java.awt.EventQueue;
+import java.awt.Robot;
+import java.awt.Point;
+import java.awt.Dimension;
+import java.awt.Window;
+import java.awt.event.InputEvent;
+import java.awt.AWTException;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseAdapter;
+import java.util.ArrayList;
+import java.util.List;
+
+public class ModalDialogOnNonEdt {
+
+    public void start () {
+        ShowModalDialog showModalDialog = new ShowModalDialog();
+
+        try {
+            EventQueue.invokeLater(showModalDialog);
+            Robot robot = new Robot();
+            robot.delay(2000);
+
+            Point origin = ShowModalDialog.lastShownDialog.getLocationOnScreen();
+            Dimension dim = ShowModalDialog.lastShownDialog.getSize();
+            robot.mouseMove((int)origin.getX() + (int)dim.getWidth()/2,
+                            (int)origin.getY() + (int)dim.getHeight()/2);
+            robot.mousePress(InputEvent.BUTTON1_MASK);
+            robot.mouseRelease(InputEvent.BUTTON1_MASK);
+
+            robot.delay(2000);
+            if (ShowModalDialog.count < 2) {
+                throw new RuntimeException("TEST FAILED: second modal dialog was not shown");
+            }
+
+            /* click on second modal dialog to verify if it receives mouse events */
+            synchronized (ShowModalDialog.monitor) {
+                origin = ShowModalDialog.lastShownDialog.getLocationOnScreen();
+                dim = ShowModalDialog.lastShownDialog.getSize();
+                robot.mouseMove((int)origin.getX() + (int)dim.getWidth()/2,
+                                (int)origin.getY() + (int)dim.getHeight()/2);
+                robot.mousePress(InputEvent.BUTTON1_MASK);
+                robot.mouseRelease(InputEvent.BUTTON1_MASK);
+
+                ShowModalDialog.monitor.wait(2000);
+            }
+
+            if (ShowModalDialog.count < 3) {
+                throw new RuntimeException("TEST FAILED: second modal dialog didn't receive mouse events");
+            }
+
+        } catch (AWTException e) {
+            e.printStackTrace();
+            throw new RuntimeException("Some AWTException occurred");
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+            throw new RuntimeException("Test was interrupted");
+        } finally {
+            for (Window w : ShowModalDialog.toDispose) {
+                w.setVisible(false);
+                w.dispose();
+            }
+        }
+
+        System.out.println("TEST PASSED");
+    }
+
+    public static void main(String[] args) {
+        new ModalDialogOnNonEdt().start();
+    }
+}
+
+class ShowModalDialog implements Runnable {
+    static volatile int count = 0;
+    static Object monitor = new Object();
+    static Dialog lastShownDialog;
+    static List<Window> toDispose = new ArrayList<>();
+
+    public void run() {
+        count++;
+        Frame frame = new Frame("Frame #" + count);
+        toDispose.add(frame);
+        Dialog dialog = new Dialog(frame, "Modal Dialog #" + count, true);
+        dialog.setSize(100, 100);
+        dialog.setLocation(100, 100*count);
+        dialog.addMouseListener(new MouseAdapter() {
+                public void mouseClicked(MouseEvent me) {
+                    System.out.println(me.toString());
+                    if (ShowModalDialog.count < 2) {
+                        Runnable runner = new ShowModalDialog();
+                        new Thread(runner).start();
+                    } else {
+                        synchronized (monitor) {
+                            ShowModalDialog.count++;
+                            monitor.notifyAll();
+                        }
+                    }
+                }
+            });
+        lastShownDialog = dialog;
+        toDispose.add(dialog);
+        dialog.setVisible(true);
+    }
+}
diff --git a/test/jdk/java/awt/Dialog/NewMessagePumpTest.java b/test/jdk/java/awt/Dialog/NewMessagePumpTest.java
new file mode 100644
index 00000000000..084d0f2e43c
--- /dev/null
+++ b/test/jdk/java/awt/Dialog/NewMessagePumpTest.java
@@ -0,0 +1,140 @@
+/*
+ * Copyright (c) 1998, 2023, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+  @test
+  @bug 4119383
+  @summary Tests total rewrite of modality blocking model
+  @key headful
+  @run main/timeout=30 NewMessagePumpTest
+*/
+
+import java.awt.BorderLayout;
+import java.awt.Button;
+import java.awt.Dialog;
+import java.awt.Dimension;
+import java.awt.EventQueue;
+import java.awt.Frame;
+import java.awt.Panel;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.lang.reflect.InvocationTargetException;
+
+public class NewMessagePumpTest {
+    public void start() {
+        Frame1 frame = new Frame1();
+        frame.validate();
+        frame.setVisible(true);
+    }
+
+    public static void main(String[] args) throws InterruptedException,
+            InvocationTargetException {
+        NewMessagePumpTest test = new NewMessagePumpTest();
+        EventQueue.invokeAndWait(test::start);
+    }
+}
+
+class Frame1 extends Frame {
+    Frame1() {
+        try {
+            jbInit();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    private void jbInit() throws Exception {
+        MyPanel panel1 = new MyPanel(this);
+        this.setLayout(new BorderLayout());
+        this.setSize(new Dimension(400, 300));
+        this.setLocationRelativeTo(null);
+        this.setTitle("Frame Title");
+        panel1.setLayout(new BorderLayout());
+        this.add(panel1, BorderLayout.CENTER);
+    }
+}
+
+class Dialog1 extends Dialog {
+    BorderLayout borderLayout1 = new BorderLayout();
+    Button button1 = new Button();
+
+    Dialog1(Frame f) {
+        super(f, true);
+        try {
+            jbInit();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    void jbInit() throws Exception {
+        button1.setLabel("close");
+        button1.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                button1_actionPerformed(e);
+            }
+        });
+        this.setLayout(borderLayout1);
+        this.add(button1, BorderLayout.NORTH);
+    }
+
+    void button1_actionPerformed(ActionEvent e) {
+        dispose();
+    }
+}
+
+class MyPanel extends Panel {
+    Frame frame;
+
+    MyPanel(Frame f) {
+        frame = f;
+    }
+
+    public void addNotify() {
+        super.addNotify();
+        System.out.println("AddNotify bringing up modal dialog...");
+        final Dialog1 dlg = new Dialog1(frame);
+        dlg.pack();
+        new Thread(() -> {
+            try {
+                Thread.sleep(5000);
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            }
+            try {
+                EventQueue.invokeAndWait(() -> {
+                    dlg.setVisible(false);
+                    dlg.dispose();
+                });
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            } catch (InvocationTargetException e) {
+                throw new RuntimeException(e);
+            }
+        }).start();
+        dlg.setVisible(true);
+        frame.setVisible(false);
+        frame.dispose();
+        System.out.println("Test passed");
+    }
+}