8047288: Fixes endless loop on mac caused by invoking Windows.isFocusable() on Appkit thread.

Reviewed-by: ant, pchelko
Contributed-by: artem.malinko@oracle.com

src/macosx/classes/sun/lwawt/LWWindowPeer.java

@@ -105,6 +105,8 @@ public class LWWindowPeer
 
     private final SecurityWarningWindow warningWindow;
 
+    private volatile boolean targetFocusable;
+
     /**
      * Current modal blocker or null.
      *
@@ -240,13 +242,12 @@ public class LWWindowPeer
         if (!visible && warningWindow != null) {
             warningWindow.setVisible(false, false);
         }
-
+        updateFocusableWindowState();
         super.setVisibleImpl(visible);
         // TODO: update graphicsConfig, see 4868278
         platformWindow.setVisible(visible);
         if (isSimpleWindow()) {
             KeyboardFocusManagerPeer kfmPeer = LWKeyboardFocusManagerPeer.getInstance();
-
             if (visible) {
                 if (!getTarget().isAutoRequestFocus()) {
                     return;
@@ -397,6 +398,7 @@ public class LWWindowPeer
 
     @Override
     public void updateFocusableWindowState() {
+        targetFocusable = getTarget().isFocusableWindow();
         platformWindow.updateFocusableWindowState();
     }
 
@@ -1220,13 +1222,13 @@ public class LWWindowPeer
     }
 
     private boolean isFocusableWindow() {
-        boolean focusable = getTarget().isFocusableWindow();
+        boolean focusable  = targetFocusable;
         if (isSimpleWindow()) {
             LWWindowPeer ownerPeer = getOwnerFrameDialog(this);
             if (ownerPeer == null) {
                 return false;
             }
-            return focusable && ownerPeer.getTarget().isFocusableWindow();
+            return focusable && ownerPeer.targetFocusable;
         }
         return focusable;
     }

test/java/awt/Focus/WindowIsFocusableAccessByThreadsTest/WindowIsFocusableAccessByThreadsTest.java

+/*
+ * Copyright (c) 2014 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      8047288
+  @summary  Tests method isFocusable of Window component. It should be accessed only from EDT
+  @author   artem.malinko@oracle.com
+  @library  ../../regtesthelpers
+  @build    Util
+  @run      main WindowIsFocusableAccessByThreadsTest
+*/
+
+import test.java.awt.regtesthelpers.Util;
+
+import javax.swing.*;
+import java.awt.*;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public class WindowIsFocusableAccessByThreadsTest {
+    private static AtomicBoolean testPassed = new AtomicBoolean(true);
+    private static volatile TestFrame frame;
+    private static volatile TestWindow window;
+    private static volatile Button openWindowBtn;
+
+    public static void main(String[] args) {
+        frame = new TestFrame("Test EDT access to Window components");
+        window = new TestWindow(frame);
+
+        SwingUtilities.invokeLater(WindowIsFocusableAccessByThreadsTest::init);
+
+        Util.waitTillShown(frame);
+        Robot robot = Util.createRobot();
+        Util.clickOnComp(frame, robot, 100);
+        Util.clickOnComp(openWindowBtn, robot, 100);
+
+        Util.waitTillShown(window);
+
+        if (!testPassed.get()) {
+            throw new RuntimeException("Window component methods has been accessed not " +
+                    "from Event Dispatching Thread");
+        }
+    }
+
+    private static void init() {
+        frame.setSize(400, 400);
+        frame.setLayout(new FlowLayout());
+        openWindowBtn = new Button("open window");
+        openWindowBtn.addActionListener(e -> {
+            window.setSize(100, 100);
+            window.setLocation(400, 100);
+            window.setVisible(true);
+        });
+        frame.add(openWindowBtn);
+        frame.setVisible(true);
+    }
+
+    private static void testThread() {
+        if (!SwingUtilities.isEventDispatchThread()) {
+            testPassed.set(false);
+        }
+    }
+
+    private static class TestWindow extends Window {
+        public TestWindow(Frame owner) {
+            super(owner);
+        }
+
+        // isFocusable method is final and we can't add this test to it.
+        // But it invokes getFocusableWindowState and here we can check
+        // if thread is EDT.
+        @Override
+        public boolean getFocusableWindowState() {
+            testThread();
+            return super.getFocusableWindowState();
+        }
+    }
+
+    private static class TestFrame extends Frame {
+        private TestFrame(String title) throws HeadlessException {
+            super(title);
+        }
+
+        // isFocusable method is final and we can't add this test to it.
+        // But it invokes getFocusableWindowState and here we can check
+        // if thread is EDT.
+        @Override
+        public boolean getFocusableWindowState() {
+            testThread();
+            return super.getFocusableWindowState();
+        }
+    }
+}