--- a/src/java.desktop/macosx/classes/sun/lwawt/macosx/CPlatformWindow.java	Tue Jan 15 16:41:17 2019 -0800
+++ b/src/java.desktop/macosx/classes/sun/lwawt/macosx/CPlatformWindow.java	Wed Jan 16 23:56:32 2019 +0530
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2019, 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
@@ -295,8 +295,6 @@
     private Rectangle normalBounds = null; // not-null only for undecorated maximized windows
     private CPlatformResponder responder;
     private long lastBecomeMainTime; // this is necessary to preserve right siblings order
-    private boolean maximizedBothState = false;
-    private boolean frameResizibilityChanged = false;
 
     public CPlatformWindow() {
         super(0, true);
@@ -399,7 +397,7 @@
 
         // Either java.awt.Frame or java.awt.Dialog can be resizable, however java.awt.Window is never resizable
         {
-            final boolean resizable = isTargetResizable();
+            final boolean resizable = isFrame ? ((Frame)target).isResizable() : (isDialog ? ((Dialog)target).isResizable() : false);
             styleBits = SET(styleBits, RESIZABLE, resizable);
             if (!resizable) {
                 styleBits = SET(styleBits, ZOOMABLE, false);
@@ -611,8 +609,6 @@
             setBounds(maximizedBounds.x, maximizedBounds.y,
                     maximizedBounds.width, maximizedBounds.height);
         }
-        setFrameResizibilityChanged(true);
-        updateResizableAndMaximizeState(true);
     }
 
     private void unmaximize() {
@@ -709,9 +705,11 @@
         // Manage the extended state when showing
         if (visible) {
             /* Frame or Dialog should be set property WINDOW_FULLSCREENABLE to true if the
-            Frame resizable and Frame state is not MAXIMIZED_BOTH or Dialog is resizable.
+            Frame or Dialog is resizable.
             **/
-            if (isTargetResizable()) {
+            final boolean resizable = (target instanceof Frame) ? ((Frame)target).isResizable() :
+            ((target instanceof Dialog) ? ((Dialog)target).isResizable() : false);
+            if (resizable) {
                 setCanFullscreen(true);
             }
 
@@ -727,11 +725,6 @@
                         frameState = Frame.ICONIFIED;
                     }
 
-                    if (isFrameResizibilityChanged()) {
-                        updateResizableAndMaximizeState(false);
-                        setFrameResizibilityChanged(false);
-                    }
-
                     switch (frameState) {
                         case Frame.ICONIFIED:
                             execute(CWrapper.NSWindow::miniaturize);
@@ -851,10 +844,9 @@
 
     @Override
     public void setResizable(final boolean resizable) {
-        boolean windowResizable = resizable && !isMaximizedBoth();
-        setCanFullscreen(windowResizable);
-        setStyleBits(RESIZABLE, windowResizable);
-        setStyleBits(ZOOMABLE, windowResizable);
+        setCanFullscreen(resizable);
+        setStyleBits(RESIZABLE, resizable);
+        setStyleBits(ZOOMABLE, resizable);
     }
 
     @Override
@@ -963,11 +955,6 @@
             windowState = Frame.ICONIFIED;
         }
 
-        if (isFrameResizibilityChanged()) {
-            updateResizableAndMaximizeState(false);
-            setFrameResizibilityChanged(false);
-        }
-
         switch (windowState) {
             case Frame.ICONIFIED:
                 if (prevWindowState == Frame.MAXIMIZED_BOTH) {
@@ -1171,21 +1158,6 @@
     }
 
     /*
-     * Resizibility of frame with state MAXIMIZED_BOTH is set to true to zoom
-     * the frame on double click on title bar and set to false later. This is
-     * required as frame won't zoom if resizibility of frame is false.
-     */
-    private void deliverDoubleClickOnTitlebar() {
-        if ((peer != null) && (target instanceof Frame)) {
-            if (isMaximizedBoth()) {
-                updateResizableAndMaximizeState(false);
-                execute(CWrapper.NSWindow::zoom);
-                updateResizableAndMaximizeState(true);
-            }
-        }
-    }
-
-    /*
      * Our focus model is synthetic and only non-simple window
      * may become natively focusable window.
      */
@@ -1350,33 +1322,6 @@
         }
         return false;
     }
-
-    private boolean isTargetResizable() {
-        if (target instanceof Frame) {
-            return ((Frame)target).isResizable() && !isMaximizedBoth();
-        } else if (target instanceof Dialog) {
-            return ((Dialog)target).isResizable();
-        }
-        return false;
-    }
-
-    private void updateResizableAndMaximizeState(boolean maximizeState) {
-        maximizedBothState = maximizeState;
-        setResizable(!maximizeState);
-    }
-
-    private boolean isMaximizedBoth() {
-        return maximizedBothState;
-    }
-
-    private void setFrameResizibilityChanged(boolean resize) {
-        frameResizibilityChanged = resize;
-    }
-
-    private boolean isFrameResizibilityChanged() {
-        return frameResizibilityChanged;
-    }
-
     // ----------------------------------------------------------------------
     //                          NATIVE CALLBACKS
     // ----------------------------------------------------------------------

--- a/src/java.desktop/macosx/native/libawt_lwawt/awt/AWTWindow.m	Tue Jan 15 16:41:17 2019 -0800
+++ b/src/java.desktop/macosx/native/libawt_lwawt/awt/AWTWindow.m	Wed Jan 16 23:56:32 2019 +0530
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2019, 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
@@ -965,11 +965,6 @@
                     // Currently, no need to deliver the whole NSEvent.
                     static JNF_MEMBER_CACHE(jm_deliverNCMouseDown, jc_CPlatformWindow, "deliverNCMouseDown", "()V");
                     JNFCallVoidMethod(env, platformWindow, jm_deliverNCMouseDown);
-                    // Deliver double click on title bar
-                    if ([event clickCount] > 1) {
-                        static JNF_MEMBER_CACHE(jm_deliverDoubleClickOnTitlebar, jc_CPlatformWindow, "deliverDoubleClickOnTitlebar", "()V");
-                        JNFCallVoidMethod(env, platformWindow, jm_deliverDoubleClickOnTitlebar);
-                    }
                     (*env)->DeleteLocalRef(env, platformWindow);
                 }
             }

--- a/test/jdk/java/awt/Frame/UnfocusableMaximizedFrameResizablity/UnfocusableMaximizedFrameResizablity.java	Tue Jan 15 16:41:17 2019 -0800
+++ b/test/jdk/java/awt/Frame/UnfocusableMaximizedFrameResizablity/UnfocusableMaximizedFrameResizablity.java	Wed Jan 16 23:56:32 2019 +0530
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2007, 2019, 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
@@ -24,7 +24,7 @@
 /*
   @test
   @key headful
-  @bug 4980161 7158623 8204860 8208125
+  @bug 4980161 7158623 8204860 8208125 8215280
   @summary Setting focusable window state to false makes the maximized frame resizable
   @compile UnfocusableMaximizedFrameResizablity.java
   @run main UnfocusableMaximizedFrameResizablity
@@ -47,8 +47,15 @@
 
     private static void createAndShowFrame() throws Exception {
 
+        //MAXIMIZED_BOTH frame is resizable on Mac OS by default. Nothing to test.
+        if (System.getProperty("os.name").toLowerCase().startsWith("mac")) {
+            cleanup();
+            return;
+        }
+
         //The MAXIMIZED_BOTH state is not supported by the toolkit. Nothing to test.
         if (!Toolkit.getDefaultToolkit().isFrameStateSupported(Frame.MAXIMIZED_BOTH)) {
+            cleanup();
             return;
         }
 
@@ -93,7 +100,9 @@
     }
 
     private static void cleanup() {
-        frame.dispose();
+        if (frame != null) {
+            frame.dispose();
+        }
         isProgInterruption = true;
         mainThread.interrupt();
     }