tisonkun commented on issue #20041:
URL: https://github.com/apache/pulsar/issues/20041#issuecomment-1501601837

   Also, the root cause is:
   
   ```
   pulsar-sql | at 
org.apache.pulsar.client.admin.internal.PulsarAdminBuilderImpl.authentication(PulsarAdminBuilderImpl.java:94)
   pulsar-sql | at 
org.apache.pulsar.sql.presto.PulsarConnectorConfig.getPulsarAdmin(PulsarConnectorConfig.java:479)
   pulsar-sql | ... 53 more
   pulsar-sql | Caused by: 
org.apache.pulsar.client.api.PulsarClientException$UnsupportedAuthenticationException:
 java.lang.ClassNotFoundException: null
   ```
   
   So it's possible that `authPluginClassName` is configured but incorrect.


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