MessageSelector cannot be resolved

Question

I learn to do rocketMQ "Filter Example", but in eclipse, I don't find MessageSelector. Who can help me?

rocketMQ Filter Example Documentation.

Answer 1

I get, it's at the http://maven.aliyun.com/nexus/

<dependency>
    <groupId>org.apache.rocketmq</groupId>
    <artifactId>rocketmq-client</artifactId>
    <version>4.2.0</version>
</dependency>