2013-07-08 14:30:16,787 ERROR org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher: ZK is null on connection event -- see stack trace for the stack trace when constructor was called on this zkw
java.lang.Exception: ZKW CONSTRUCTOR STACK TRACE FOR DEBUGGING
        at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.<init>(ZooKeeperWatcher.java:143)
        at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.<init>(ZooKeeperWatcher.java:127)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.initializeZooKeeper(HRegionServer.java:641)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.preRegistrationInitialization(HRegionServer.java:609)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:735)
        at java.lang.Thread.run(Thread.java:662)
2013-07-08 14:30:16,789 ERROR org.apache.zookeeper.ClientCnxn: Error while calling watcher
java.lang.NullPointerException: ZK is null
        at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.connectionEvent(ZooKeeperWatcher.java:366)
        at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.process(ZooKeeperWatcher.java:303)
        at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:521)
        at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:497)