java连接服务查询nebula时候，发生报错

问答 问题
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各位大佬，小弟允许java连接服务查询nebula时候，发生报错：

Caused by: com.vesoft.nebula.client.graph.exception.NotValidConnectionException: No extra connection: All servers are broken.
	at com.vesoft.nebula.client.graph.net.NebulaPool.getConnection(NebulaPool.java:215)
	at com.vesoft.nebula.client.graph.net.NebulaPool.getSession(NebulaPool.java:137)
	at com.jiangxia.example.kg_dubbo.dao.nebula_jdbc.impl.NebulaDriver.getSessionFromNebulaPool(NebulaDriver.java:113)

zookeeper服务端和客户端均已打开；
ubuntu和主机可以ping通
求解啊！给个思路也可以！

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你把 nebula-java session 连接那块的代码贴一下