Pubsub doens't work on GAE standard. Please add support for GAEStandard.
pubsub-java throws the following error on initialization
with
PubSub pubsub = PubSubOptions.getDefaultInstance().getService();
error:
java.lang.NoClassDefFoundError: java.nio.channels.spi.SelectorProvider is a restricted class.
Please see the Google App Engine developer's guide for more details. at
(i suspect its not supported if the library now is gRPC only)