codelipenghui opened a new issue #4648: [doc] cause deadlock while use subscribeAsync demo in java client doc. URL: https://github.com/apache/pulsar/issues/4648 Here is the example in http://pulsar.apache.org/docs/en/client-libraries-java/#multi-topic-subscriptions  Use receive() to get message in subscribeAsync.thenAccept() will cause deadlock, because thread will block at receive() and can't call sendFlowPermitsToBroker(), so the thread will block forever. Need to update doc http://pulsar.apache.org/docs/en/client-libraries-java/#multi-topic-subscriptions
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