Exception in thread "main" java.lang.NoSuchMethodError: java.util.concurrent.ConcurrentHashMap.keySet()Ljava/util/concurrent/ConcurrentHashMap$KeySetView;
	at org.apache.helix.messaging.handling.HelixTaskExecutor.init(HelixTaskExecutor.java:479)
	at org.apache.helix.messaging.handling.HelixTaskExecutor.onMessage(HelixTaskExecutor.java:512)
	at org.apache.helix.manager.zk.CallbackHandler.invoke(CallbackHandler.java:198)
	at org.apache.helix.manager.zk.CallbackHandler.init(CallbackHandler.java:324)
	at org.apache.helix.manager.zk.CallbackHandler.<init>(CallbackHandler.java:114)
	at org.apache.helix.manager.zk.ZKHelixManager.addListener(ZKHelixManager.java:314)
	at org.apache.helix.manager.zk.ZKHelixManager.addControllerMessageListener(ZKHelixManager.java:398)
	at org.apache.helix.manager.zk.ControllerManagerHelper.addListenersToController(ControllerManagerHelper.java:54)
	at org.apache.helix.manager.zk.DistributedLeaderElection.onControllerChange(DistributedLeaderElection.java:93)
	at org.apache.helix.manager.zk.CallbackHandler.invoke(CallbackHandler.java:209)
	at org.apache.helix.manager.zk.CallbackHandler.init(CallbackHandler.java:324)
	at org.apache.helix.manager.zk.CallbackHandler.<init>(CallbackHandler.java:114)
	at org.apache.helix.manager.zk.ZKHelixManager.handleNewSessionAsController(ZKHelixManager.java:906)
	at org.apache.helix.manager.zk.ZKHelixManager.handleNewSession(ZKHelixManager.java:855)
	at org.apache.helix.manager.zk.ZKHelixManager.createClient(ZKHelixManager.java:493)
	at org.apache.helix.manager.zk.ZKHelixManager.connect(ZKHelixManager.java:530)
	at org.apache.helix.controller.HelixControllerMain.startHelixController(HelixControllerMain.java:156)
	at org.apache.helix.controller.HelixControllerMain.main(HelixControllerMain.java:209)