ShannonDing opened a new issue #3559:
URL: https://github.com/apache/rocketmq/issues/3559
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.
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