--- old/src/java.desktop/macosx/native/libawt_lwawt/awt/AWTWindow.m	2018-09-21 16:33:23.000000000 +0530
+++ new/src/java.desktop/macosx/native/libawt_lwawt/awt/AWTWindow.m	2018-09-21 16:33:22.000000000 +0530
@@ -950,6 +950,11 @@
                     // 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);
                 }
             }