title: java.lang.NumberFormatException when trying to connect to HBase
body: <p>I am setting HBase configuration <code>new HBaseGraphConfiguration().set("hbase.zookeeper.quorum", ZOOKEPER_QORUM_NODE)</code> where </p>
  
  <p><code>ZOOKEPER_QORUM_NODE = "172.31.17.251:2181,172.31.17.252:2181,172.31.17.253:2181";</code></p>
  
  <p>However it throws an <code>java.lang.NumberFormatException</code>, the part of the error is </p>
  
  <pre><code>Caused by: java.lang.NumberFormatException: For input string: "2181]"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Integer.parseInt(Integer.java:580)
    at java.lang.Integer.parseInt(Integer.java:615)
    at org.apache.zookeeper.client.ConnectStringParser.&lt;init&gt;(ConnectStringParser.java:72)
  </code></pre>
  
  <p>The console output before the error line is </p>
  
  <pre><code>2018-05-30 14:40:52 INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=[172.31.17.251:2181, 172.31.17.252:2181, 172.31.17.253:2181] sessionTimeout=180000 watcher=hconnection-0x25a65b770x0, quorum=[172.31.17.251:2181, 172.31.17.252:2181, 172.31.17.253:2181], baseZNode=/hbase
  2018-05-30 14:40:52 INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=[172.31.17.251:2181, 172.31.17.252:2181, 172.31.17.253:2181] sessionTimeout=180000 watcher=hconnection-0x25a65b770x0, quorum=[172.31.17.251:2181, 172.31.17.252:2181, 172.31.17.253:2181], baseZNode=/hbase
  </code></pre>
  
  <p>How to solve it?</p>