code: void handleSubscriberException(Throwable e, SubscriberExceptionContext context) {
      checkNotNull(e);
      checkNotNull(context);
      try {
        exceptionHandler.handleException(e, context);
      } catch (Throwable e2) {
        // if the handler threw an exception... well, just log it
        logger.log(Level.SEVERE,
            String.format("Exception %s thrown while handling exception: %s", e2, e), e2);
      }
    }
docs: Handles the given exception thrown by a subscriber with the given context.