java中的Zookeeper连接

下面的代码（不是我的）应该使用znode_exists（）方法检查zookeeper的连接状态。我想在发布消息之前在producerAPI使用它。但是我在定义ZooKeeperConnection对象时出错了。我已经添加了可能的类和库

import java.io.IOException;
//import org.apache.zookeeper.*; adding this doesn't help
import org.apache.zookeeper.ZooKeeperMain;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.data.Stat;
public class ZKExists {
    private static ZooKeeper zk;
       private static ZooKeeperConnection conn; // Object cannot be resolve to a type

       // Method to check existence of znode and its status, if znode is available.
       public static Stat znode_exists(String path) throws
          KeeperException,InterruptedException {
          return zk.exists(path, true);
       }

       public static void main(String[] args) throws InterruptedException,KeeperException {
          String path = "/Znode_path"; // Assign znode to the specified path

          try {
              ZooKeeperConnection conn = new ZooKeeperConnection();
             zk = conn.connect("localhost");
             Stat stat = znode_exists(path); // Stat checks the path of the znode

             if(stat != null) {
                System.out.println("Node exists and the node version is " +
                stat.getVersion());
             } else {
                System.out.println("Node does not exists");
             }

          } catch(Exception e) {
             System.out.println(e.getMessage()); // Catches error messages
          }
       }

}

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要使对象有效，我缺少哪个库？

是否要将消息发布到Apache Kafka主题？假设您这样做：发布前不需要检查Zookeeper，只需发布到Kafka并处理任何错误即可。卡夫卡要求Zookeeper无论如何都要运行，否则它将无法工作。在生产中，你会监控应用程序。@JensHoffmann是的，我会。我只是觉得最好看看是否有经纪人。我知道经纪人支票比zk支票更明智。但我无法使用“zkUtils.getAllBrokerIncluster（）”作为列表。是否要将消息发布到Apache Kafka主题？假设这样做：发布前不需要检查Zookeeper，只需发布到Kafka并处理任何错误即可。卡夫卡要求Zookeeper无论如何都要运行，否则它将无法工作。在生产中，你会监控应用程序。@JensHoffmann是的，我会。我只是觉得最好看看是否有经纪人。我知道经纪人支票比zk支票更明智。但是我不能使用“zkUtils.getAllBrokerIncluster（）”作为列表。