ShannonDing opened a new issue, #5131:
URL: https://github.com/apache/rocketmq/issues/5131
The producer instance should be shutdown after sending namespacing messages.
```
public static void main(String[] args) throws Exception {
DefaultMQProducer producer = new DefaultMQProducer(NAMESPACE,
PRODUCER_GROUP);
producer.setNamesrvAddr(DEFAULT_NAMESRVADDR);
producer.start();
for (int i = 0; i < MESSAGE_COUNT; i++) {
Message message = new Message(TOPIC, TAG, "Hello
world".getBytes(StandardCharsets.UTF_8));
try {
SendResult result = producer.send(message);
System.out.printf("Topic:%s send success, misId is:%s%n",
message.getTopic(), result.getMsgId());
} catch (Exception e) {
e.printStackTrace();
}
}
}
```
https://github.com/apache/rocketmq/blob/develop/example/src/main/java/org/apache/rocketmq/example/namespace/ProducerWithNamespace.java
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