BewareMyPower commented on pull request #10055:
URL: https://github.com/apache/pulsar/pull/10055#issuecomment-808710454


   @eolivelli 
   
   Here's the completed exception stack.
   
   ```
   Exception in thread "main" java.lang.RuntimeException: 
java.lang.ClassNotFoundException: 
org.glassfish.jersey.client.JerseyClientBuilder
        at javax.ws.rs.client.ClientBuilder.newBuilder(ClientBuilder.java:110)
        at javax.ws.rs.client.ClientBuilder.newClient(ClientBuilder.java:121)
        at 
org.apache.pulsar.client.impl.auth.AuthenticationSasl.start(AuthenticationSasl.java:164)
        at 
org.apache.pulsar.client.impl.PulsarClientImpl.<init>(PulsarClientImpl.java:146)
        at 
org.apache.pulsar.client.impl.PulsarClientImpl.<init>(PulsarClientImpl.java:134)
        at 
org.apache.pulsar.client.impl.PulsarClientImpl.<init>(PulsarClientImpl.java:130)
        at 
org.apache.pulsar.client.impl.ClientBuilderImpl.build(ClientBuilderImpl.java:65)
        at pulsar.KerberosAuthClient.main(KerberosAuthClient.java:27)
   ```
   
   From `javax.ws.rs.client.ClientBuilder.newBuilder` we can see
   
   ```java
       public static ClientBuilder newBuilder() {
           try {
               Object delegate = 
FactoryFinder.find("javax.ws.rs.client.ClientBuilder", 
"org.glassfish.jersey.client.JerseyClientBuilder", ClientBuilder.class);
               if (!(delegate instanceof ClientBuilder)) {
                   Class pClass = ClientBuilder.class;
                   String classnameAsResource = pClass.getName().replace('.', 
'/') + ".class";
                   ClassLoader loader = pClass.getClassLoader();
                   if (loader == null) {
                       loader = ClassLoader.getSystemClassLoader();
                   }
   ```
   
   It tries to load `JerseyClientBuilder` dynamically.


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