Denes Bodo created HIVE-21507:
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             Summary: Hive swallows NPE if no delegation token found
                 Key: HIVE-21507
                 URL: https://issues.apache.org/jira/browse/HIVE-21507
             Project: Hive
          Issue Type: Bug
          Components: JDBC
    Affects Versions: 3.1.1
            Reporter: Denes Bodo
            Assignee: Denes Bodo


In case if there is no delegation token put into token file, this 
[line|https://github.com/apache/hive/blob/master/jdbc/src/java/org/apache/hive/jdbc/HiveConnection.java#L777]
 will cause a NullPointerException which is not handled and the user is not 
notified in any way.

To cause NPE the use case is to have an Oozie Sqoop import to Hive in a 
kerberized cluster. Oozie puts the delegation token into the token file with 
id: *HIVE_DELEGATION_TOKEN_hiveserver2ClientToken*. So with id *hive* it is not 
working. However, fallback code uses the key which Oozie provides 
[this|https://github.com/apache/hive/blob/master/jdbc/src/java/org/apache/hive/jdbc/HiveConnection.java#L784]
 way.

I suggest to have warning message to user that key with id *hive* cannot be 
used and falling back to get delegation token from the session.

I am creating the patch.



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