[fix] Initialize UrlServiceProvider before trying to use transaction coordinator (#23914)

Author: merlimat

pulsar-client/src/main/java/org/apache/pulsar/client/impl/ClientBuilderImpl.java

@@ -68,11 +68,7 @@ public PulsarClient build() throws PulsarClientException {
         if (conf.getAuthentication() == null || conf.getAuthentication() == AuthenticationDisabled.INSTANCE) {
             setAuthenticationFromPropsIfAvailable(conf);
         }
-        PulsarClient client = new PulsarClientImpl(conf);
-        if (conf.getServiceUrlProvider() != null) {
-            conf.getServiceUrlProvider().initialize(client);
-        }
-        return client;
+        return new PulsarClientImpl(conf);
     }
 
     @Override

pulsar-client/src/main/java/org/apache/pulsar/client/impl/PulsarClientImpl.java

@@ -247,6 +247,10 @@ private PulsarClientImpl(ClientConfigurationData conf, EventLoopGroup eventLoopG
                 this.timer = timer;
             }
 
+            if (conf.getServiceUrlProvider() != null) {
+                conf.getServiceUrlProvider().initialize(this);
+            }
+
             if (conf.isEnableTransaction()) {
                 tcClient = new TransactionCoordinatorClientImpl(this);
                 try {