diff -r 0d757a37896c -r 3c4c1debe32c src/java.desktop/macosx/native/libawt_lwawt/awt/AWTWindow.m
--- a/src/java.desktop/macosx/native/libawt_lwawt/awt/AWTWindow.m	Tue Nov 27 10:59:24 2018 +0530
+++ b/src/java.desktop/macosx/native/libawt_lwawt/awt/AWTWindow.m	Tue Nov 27 13:47:31 2018 +0530
@@ -965,6 +965,11 @@
                     // 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);
                 }
             }