jixuan1989 commented on issue #822: [IOTDB-502] Fix possible NPE in 
`org.apache.iotdb.db.service.TSServiceImpl`
URL: https://github.com/apache/incubator-iotdb/pull/822#issuecomment-587490819
 
 
   I tried. In this way, the start-client.sh tool will report: 
   ```
   IoTDB> Can not establish connection with jdbc:iotdb://127.0.0.1:6667/. Host 
is 127.0.0.1, port is 6667.
   ```
   
   If we use JDCB like 
   ```
   Connection connection = 
DriverManager.getConnection("jdbc:iotdb://127.0.0.1:6667/", "root", "root")
   ```
   
    then an exception will be thrown:
   ```
   Exception in thread "main" java.sql.SQLException: Can not establish 
connection with jdbc:iotdb://127.0.0.1:6667/.
        at 
org.apache.iotdb.jdbc.IoTDBConnection.openSession(IoTDBConnection.java:435)
        at org.apache.iotdb.jdbc.IoTDBConnection.<init>(IoTDBConnection.java:84)
        at org.apache.iotdb.jdbc.IoTDBDriver.connect(IoTDBDriver.java:63)
        at java.sql.DriverManager.getConnection(DriverManager.java:664)
        at java.sql.DriverManager.getConnection(DriverManager.java:247)
        at org.apache.iotdb.JDBCExample.main(JDBCExample.java:32)
   Caused by: org.apache.thrift.TApplicationException: getTimeZone failed: 
unknown result
        at 
org.apache.iotdb.service.rpc.thrift.TSIService$Client.recv_getTimeZone(TSIService.java:405)
        at 
org.apache.iotdb.service.rpc.thrift.TSIService$Client.getTimeZone(TSIService.java:389)
        at 
org.apache.iotdb.jdbc.IoTDBConnection.getTimeZone(IoTDBConnection.java:475)
        at 
org.apache.iotdb.jdbc.IoTDBConnection.openSession(IoTDBConnection.java:431)
        ... 5 more
   ```
   
   It is accepted, at least better than the current status.

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