code: void afterStop(final Actor actor) {
      try {
        actor.afterStop();
      } catch (Throwable t) {
        environment.logger.log("vlingo/actors: Actor afterStop() failed: " + t.getMessage(), t);
        environment.stage.handleFailureOf(new StageSupervisedActor(Stoppable.class, actor, t));
      }
    }
docs: =======================================