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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