GitHub user codelipenghui added a comment to the discussion:
negativeAcknowledge() parameter does not take effect
@yebai1105 You can acked the message at
```
msg = (Message) obj;
System.out.println("Message received: " + msg.getValue());
consumer.acknowledge(msg);
```
A acked message can not be redeliver again
GitHub link:
https://github.com/apache/pulsar/discussions/18857#discussioncomment-4352723
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