如何修复RocketmqClient中“name server中没有topic的topic路由信息”异常

sh mqadmin updateTopic -n <namesrvAddr> -t <topicName> -c <clusterName>

DefaultMQProducer producer = new DefaultMQProducer("ProducerGroupName");
producer.setNamesrvAddr("nameserver1:9876;nameserver2:9876");

ping nameserver1
telnet nameserver1 9876

import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;

public class Producer {
    public static void main(String[] args) throws Exception {
        DefaultMQProducer producer = new DefaultMQProducer("ProducerGroupName");
        producer.setNamesrvAddr("nameserver1:9876;nameserver2:9876");

        try {
            producer.start();
            Message msg = new Message("TestTopic", "TagA", "Hello RocketMQ".getBytes());
            SendResult sendResult = producer.send(msg);
            System.out.printf("%s%n", sendResult);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            producer.shutdown();
        }
    }
}