zookeeper 链接报错 KeeperErrorCode = NodeExists for

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Receive watched event:WatchedEvent state:SyncConnected type:None path:null
ZooKeeper session established.
org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode = NodeExists for /test_node
	at org.apache.zookeeper.KeeperException.create(KeeperException.java:119)
	at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
	at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:783)
	at ZKTest.doSomething(ZKTest.java:27)
	at ZKTest.process(ZKTest.java:21)
	at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:522)
	at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:498)　CONNECTING
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