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java.lang.NullPointerException: 	at org.apache.zookeeper.server.util.ConfigUtils.getClientConfigStr(	at org.apache.zookeeper.cli.GetConfigCommand.exec(	at org.apache.zookeeper.ZooKeeperMain.processZKCmd(	at org.apache.zookeeper.ZooKeeperMain.processCmd(	at org.apache.zookeeper.ZooKeeperMain.executeLine(	at	at org.apache.zookeeper.ZooKeeperMain.main(