[GitHub] [pulsar] BewareMyPower commented on issue #12189: How to get the messageID

[GitBox <gi...@apache.org>]

BewareMyPower commented on issue #12189:
URL: https://github.com/apache/pulsar/issues/12189#issuecomment-927628301


   ```java
           try (PulsarClient client = PulsarClient.builder().serviceUrl("pulsar://localhost:6650").build()) {
               final String topic = "topic";
               final Consumer<byte[]> consumer = client.newConsumer()
                       .topic(topic)
                       .subscriptionName("sub")
                       .subscribe();
               final Producer<byte[]> producer = client.newProducer()
                       .topic(topic)
                       .create();
               final CountDownLatch latch = new CountDownLatch(1);
               producer.sendAsync("hello".getBytes(StandardCharsets.UTF_8)).whenComplete((id, e) -> {
                   if (e == null) {
                       System.out.println("Send to " + id + ", type: " + id.getClass().getTypeName());
                   }
                   latch.countDown();
               });
               final Message<byte[]> message = consumer.receive();
               final MessageId id = message.getMessageId();
               System.out.println("Received from " + id + ", type: " + id.getClass());
               latch.await(); // wait until send callback is triggered
           } catch (PulsarClientException | InterruptedException e) {
               e.printStackTrace();
           }
   ```


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