code: public RetryerBuilder<V> retryIfExceptionOfType(@Nonnull Class<? extends Throwable> exceptionClass) {
          Preconditions.checkNotNull(exceptionClass, "exceptionClass may not be null");
          rejectionPredicate = Predicates.or(rejectionPredicate, new ExceptionClassPredicate<V>(exceptionClass));
          return this;
      }
docs: Configures the retryer to retry if an exception of the given class (or subclass of the given class) is
  thrown by the call.
  
  @param exceptionClass the type of the exception which should cause the retryer to retry
  @return <code>this</code>