src/macosx/classes/sun/lwawt/macosx/CPlatformEmbeddedFrame.java

*** 149,158 ****
--- 149,162 ----
      public void setMenuBar(MenuBar mb) {}
  
      @Override
      public void setAlwaysOnTop(boolean value) {}
  
+     // This method should be properly implemented for applets.
+     // It returns null just as a stub.
+     public PlatformWindow getTopmostPlatformWindowUnderMouse() { return null; }
+ 
      @Override
      public void updateFocusableWindowState() {}
  
      @Override
      public boolean rejectFocusRequest(CausedFocusEvent.Cause cause) {