onobc opened a new pull request, #18358:
URL: https://github.com/apache/pulsar/pull/18358

   ### Motivation
   Authentication for the admin client can not be specified on the 
`PulsarAdminBuilder` using configuration properties only. 
   The `PulsarClientBuilder::authentication` method must be called to set the 
authentication, currently. 
   
   This is inconsistent w/ the regular PulsarClient which does in fact check 
for the auth properties 
[here](https://github.com/apache/pulsar/blob/a2c15340d3a73401b57574a4032ca375bde502bc/pulsar-client/src/main/java/org/apache/pulsar/client/impl/PulsarClientImpl.java#L192).
 
   
   #### Example
   
   This works
   ```java
   AuthenticationBasic auth = new AuthenticationBasic();
   auth.configure("{\"userId\":\"foo\", \"password\":\"bar\"}");
   PulsarAdmin adminWithAuth = PulsarAdmin.builder()
       .serviceHttpUrl("...")
       .authentication(auth)
       .build();
   ```
   
   This does not work 
   ```java
   Map<String, Object> config = new HashMap<>();
   config.put("authPluginClassName", 
"org.apache.pulsar.client.impl.auth.AuthenticationBasic");
   config.put("authParams", "{\"userId\":\"foo\", \"password\":\"bar\"}");
   PulsarAdmin adminWithoutAuth = PulsarAdmin.builder()
       .serviceHttpUrl("...")
       .loadConf(config)
       .build();
   ```
   
   ### Modifications
   The `ClientBuilderImpl::loadConf` and `PusarAdminBuilderImpl::loadConf` now 
use `authPluginClassName`
   and one of `authParams` or `authParamsMap` to set authentication.
   Since the authentication is correctly set by `ClientBuilderImpl`, the code 
to set the authentication can be removed from `PulsarClientImpl::new`
   
   This change also adds a new unit test class for this functionality.
   
   ### Verifying this change
   - [ ] Make sure that the change passes the CI checks.
   
   This change added tests and can be verified as follows:
   - Run `PulsarClientImplTest::*`
   - Run `PulsarAdminImplTest::*`
   
   ### Documentation
   - [ ] `doc` <!-- Your PR contains doc changes -->
   - [ ] `doc-required` <!-- Your PR changes impact docs and you will update 
later -->
   - [x] `doc-not-needed` <!-- Your PR changes do not impact docs -->
   - [ ] `doc-complete` <!-- Docs have been already added -->
   
   ### Matching PR in forked repository
   PR in forked repository: https://github.com/onobc/pulsar/pull/1


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