src/java.desktop/macosx/native/libawt_lwawt/awt/AWTWindow.m

@@ -948,10 +948,15 @@
                 jobject platformWindow = [self.javaPlatformWindow jObjectWithEnv:env];
                 if (platformWindow != NULL) {
                     // 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);
                 }
             }
         }
 }