fmiguelez commented on issue #9867:
URL: https://github.com/apache/pulsar/issues/9867#issuecomment-796623650


   > You can try to use 
`[org.apache.pulsar.broker.authentication.AuthenticationProviderTls]` or 
`[org.apache.pulsar.broker.authentication.AuthenticationProviderTls,org.apache.pulsar.broker.authentication.AuthenticationProviderAthen]`
 to fetch values of array types.
   
   It will not work either. You can try your proposal yourself with (it fails 
with same error):
   
   ```shell
   docker run -e 
"PF_authenticationProviders=[org.apache.pulsar.broker.authentication.AuthenticationProviderTls]"
 apachepulsar/pulsar:2.7.0 bash -c "bin/gen-yml-from-env.py 
conf/functions_worker.yml; bin/pulsar functions-worker;"
   ```
   
   The problem is that they python script interprets the value as a string so 
final value you will see in yaml file will be:
   
   ```yaml
   authenticationProviders: 
'[org.apache.pulsar.broker.authentication.AuthenticationProviderTls]'
   ```
   
   I does not matter if you enclose the value in square brackets or not, final 
result will always be quoted (string) and thus provoke an exception on Java 
when trying to read it as a `Set<String>`. 
   
   I have some changes on the script so I when we finish testing it locally I 
will publish a pull request with the corrections to solve the issue.
   
   
   
   


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