linlinnn edited a comment on issue #10377:
URL: https://github.com/apache/pulsar/issues/10377#issuecomment-827659941
@jvoigt
There are some issues in your code.
1. Consumer should subscribe before producer send message.
2. The correct name of dlq topic is
`jsonTopic-subscription-DLQ`(persistent://public/default/jsonTopic-subscription-DLQ).
3. Add something like `CountDownLatch` to avoid `main thread` exit.
Then you can get expect result, good luck.
```shell
22:41:55.931 [pulsar-external-listener-48-1] INFO
org.apache.pulsar.client.api.DeadLetterTopicTest -
persistent://public/default/jsonTopic-subscription-DLQ => Message received:
{"message":"My Payload"}
22:41:55.931 [pulsar-external-listener-48-1] ERROR
org.apache.pulsar.client.api.DeadLetterTopicTest -
persistent://public/default/jsonTopic-subscription-DLQ => I WILL NACK IT with
Counter: 3
```
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