Make sure the list of message queues is not null before using selecting a queue. in orderly message sending example.

[ShannonDing]

in example/ordermessage/producer.java. make sure message queue is not null before using selecting a queue.

SendResult sendResult = producer.send(msg, new MessageQueueSelector() {
       @Override
        public MessageQueue select(List<MessageQueue> mqs, Message msg, Object arg) {
        Integer id = (Integer) arg;
        int index = id % mqs.size();
        return mqs.get(index);
       }
 }, orderId);

if the mqs is null, mqs.size() may be crash.

[chenlong1993]

please assign this work to me.

[ShannonDing]

please assign this work to me.

Welcome. assigned.

[ShannonDing]

ping @clbigdata

[devfat]

@ShannonDing The main process of sending message is in method org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl#sendSelectImpl.

The topicPublishInfo.ok() is called before calling MessageQueueSelector#select, what any else situation will cause the empty message queue list?

[zhiliatom]

@devfat you are right

[acmday]

So, this issue can be closed,right?

[sunheyi6]

So, this issue can be closed,right?

@ShannonDing