Github user matyix commented on the issue:

    https://github.com/apache/zeppelin/pull/2637
  
    hello @echarles 
    
    - we're also running into this NPE problem, my colleague @sancyx already 
commented on this issue: https://issues.apache.org/jira/browse/ZEPPELIN-2475 
and he's going to submit a PR to solve this problem
    - executor pod name is generated by Spark Driver using the `spark.app.name` 
specified in `spark-submit` as a prefix. To `spark.app.name` prefix specified 
in interpreter settings is appended to the groupId of the interpreter group. 
    - are the dependencies added to the spark-submit command as --jars ? If so 
can you please share the logs?


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