smolnar82 commented on a change in pull request #361:
URL: https://github.com/apache/knox/pull/361#discussion_r454391965



##########
File path: 
gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/ZookeeperRemoteAliasService.java
##########
@@ -190,13 +190,18 @@ private static void checkPathsExist(final 
RemoteConfigurationRegistryClient remo
      *
      * @param clusterName
      *            cluster name
-     * @return List of all the aliases
+     * @return List of all the aliases (an empty list, in case there is no 
alias for the given cluster)
      */
     @Override
     public List<String> getAliasesForCluster(final String clusterName) throws 
AliasServiceException {
-        final List<String> localAliases = 
localAliasService.getAliasesForCluster(clusterName);
+        final List<String> localAliases = localAliasService == null ? 
Collections.emptyList() : localAliasService.getAliasesForCluster(clusterName);
         if (localAliases == null || localAliases.isEmpty()) {
-          return remoteClient == null ? new ArrayList<>() : 
remoteClient.listChildEntries(buildClusterEntryName(clusterName));
+          if (remoteClient != null) {
+            final List<String> remoteAliases = 
remoteClient.listChildEntries(buildClusterEntryName(clusterName));
+            return remoteAliases == null ? new ArrayList<>() : remoteAliases;
+          } else {
+            return new ArrayList<>();

Review comment:
       I've no idea if it should be mutable and I did not want to touch that 
part -> this is why I use the same way to return in the other case too.




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