src/java.desktop/macosx/classes/com/apple/eawt/_AppMenuBarHandler.java

@@ -103,18 +103,18 @@
         }
 
         final MenuBarUI ui = menuBar.getUI();
         if (!(ui instanceof AquaMenuBarUI)) {
             // Aqua was not installed
-            throw new IllegalStateException("Application.setDefaultMenuBar() only works with the Aqua Look and Feel");
+            return;
         }
 
         final AquaMenuBarUI aquaUI = (AquaMenuBarUI)ui;
         final ScreenMenuBar screenMenuBar = aquaUI.getScreenMenuBar();
         if (screenMenuBar == null) {
             // Aqua is installed, but we aren't using the screen menu bar
-            throw new IllegalStateException("Application.setDefaultMenuBar() only works if apple.laf.useScreenMenuBar=true");
+            return;
         }
 
         screenMenuBar.addNotify();
         final Object peer = AWTAccessor.getMenuComponentAccessor().getPeer(screenMenuBar);
         if (!(peer instanceof CMenuBar)) {