NazerkeBS commented on a change in pull request #322:
URL: https://github.com/apache/solr/pull/322#discussion_r724035366



##########
File path: solr/core/src/java/org/apache/solr/core/ConfigSetService.java
##########
@@ -78,28 +80,30 @@ private static ConfigSetService instantiate(CoreContainer 
coreContainer) {
     }
   }
 
-  public void bootstrapConfigSet() {
+  private void bootstrapConfigSet(CoreContainer coreContainer) {
     // bootstrap _default conf, bootstrap_confdir and bootstrap_conf if 
provided via system property
-    String confDir = System.getProperty("bootstrap_confdir");
-    boolean boostrapConf = Boolean.getBoolean("bootstrap_conf");
     try {
       // _default conf
       bootstrapDefaultConf();
+
       // bootstrap_confdir
+      String confDir = System.getProperty("bootstrap_confdir");
       if (confDir != null) {
         bootstrapConfDir(confDir);
       }
+
       // bootstrap_conf, in SolrCloud mode
+      boolean boostrapConf = Boolean.getBoolean("bootstrap_conf");
       if (boostrapConf == true) {
-        if (this instanceof ZkConfigSetService) {
-          bootstrapConf(((ZkConfigSetService) 
this).getZkController().getCoreContainer());
+        if (coreContainer.getZkController() != null) {

Review comment:
       another concern: ZkCli.main() uses ConfigSetService.bootstrapConf(); 
although it is ZkConfigSetService, zkController is null. I tempted to do 
assertion `assert coreContainer.getZkContainer != null` in 
ConfigSetService.bootstrapConf(), but then I saw zkController is not 
instantiated in ZkCli. Maybe it is an edge case ? 




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