(省略)
public class ServiceActivator implements BundleActivator {

   private ServiceRegistration registration;

   public void start(BundleContext context) throws Exception { //リスト2-1
      System.out.println("Hello OSGi Service!");
      INotificationService service = new HelloNotificationService();
      registration = context.registerService(INotificationService.class.getName(), service, new Hashtable()); //リスト 2-2
   }

   public void stop(BundleContext context) throws Exception { //リスト2-3
      registration.unregister();@
      System.out.println("Goodbye OSGi Service.");
   }

}