java连接zookeeper服务器出现“KeeperErrorCode = ConnectionLoss for ...”

1 Exception in thread "main" org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /test
2     at org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
3     at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
4     at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1041)
5     at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1069)
6     at cn.zhang.bigdata.zk.ZooKeeperTest.main(ZooKeeperTest.java:11)

1 1、连接还没有创建完成，就操作节点就会报异常？（最多，而且千篇一律，都一样）
2 2、用最新的jar试一下？（试了不好用）
3 3、防火墙没有关闭？（我的已经关闭）

1 // 将时间改为 15秒，即可
2  ZooKeeper zk = new ZooKeeper("10.0.0.11:2181", 15000, null);