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java.lang.NullPointerException: 	at java.util.StringTokenizer.(StringTokenizer.java:199)	at java.util.StringTokenizer.(StringTokenizer.java:221)	at org.apache.zookeeper.ZooKeeperMain$MyCommandOptions.parseCommand(ZooKeeperMain.java:219)	at org.apache.zookeeper.ZooKeeperMain.processZKCmd(ZooKeeperMain.java:638)	at org.apache.zookeeper.ZooKeeperMain.processCmd(ZooKeeperMain.java:577)	at org.apache.zookeeper.ZooKeeperMain.executeLine(ZooKeeperMain.java:360)	at org.apache.zookeeper.ZooKeeperMain.run(ZooKeeperMain.java:320)	at org.apache.zookeeper.ZooKeeperMain.main(ZooKeeperMain.java:280)