title: apache-drill storage plugin creation failed
body: <p>I was trying to create a storage plugin configuration in apache-drill ( 1.6 ) for oracle jdbc. I have already copied <code>ojdbc7.jar</code>  within the <code>apache-drill-1.6.0/jars/3rdparty</code>  directory.  </p>
  
  <p>But am getting an error  </p>
  
  <blockquote>
    <p>Please retry: error (unable to create/ update storage)</p>
  </blockquote>
  
  <p>while trying to create the storage plugin !</p>
  
  <p>Here is the storage plugin configuration: </p>
  
  <pre><code>   {
        "type": "jdbc",
        "driver": "oracle.jdbc.OracleDriver",
        "url": "jdbc:oracle:thin:username/password@xx.xx.xx.xx:1521:***",
        "enabled": true
      }
  </code></pre>
  
  <p>&amp; here is the <code>drill-override.conf</code> file : </p>
  
  <pre><code>drill.exec: {
    cluster-id: "drillbits1",
    zk.connect: "localhost:2181",
    sys.store.provider.local.path="/data/drill"
  }
  </code></pre>
  
  <p>I have restarted drill after copying ojdbc7.jar file within the drill 3rd party directory ! </p>
  
  <p>I found some similar issues here in stackoverflow .. ( <a href="https://stackoverflow.com/questions/34291340/cant-create-drill-storage-plugin-for-oracle">storage_plugin failure</a> &amp; <a href="https://stackoverflow.com/questions/33351412/apache-drill-1-2-and-oracle-jdbc">drill-1.3&amp;Oracle jdbc</a> ) But nothing worked for me !! </p>
  
  <p>Do you have any idea about this ? </p>
  
  <p>[ I am using apache-drill version 1.6 in distributed mode ,  centOS 7 &amp; java_version 1.8 ]</p>