src/share/classes/sun/applet/AppletPanel.java

@@ -60,10 +60,11 @@
  * thread group to call the applet's init(), start(), stop(), and
  * destroy() methods.
  *
  * @author      Arthur van Hoff
  */
+@SuppressWarnings("serial") // JDK implementation class
 public
 abstract class AppletPanel extends Panel implements AppletStub, Runnable {
 
     /**
      * The applet (if loaded).