michaeljmarshall commented on PR #15247:
URL: https://github.com/apache/pulsar/pull/15247#issuecomment-1104698923

   I was wondering when this would be an NPE, and it looks like it's most 
likely an NPE when `fileConfig.validate();` throws an exception. In that case, 
the `executor` is left `null` and the resulting cleanup calls `close()`, which 
expects a non-null `executor`.


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