smolnar82 commented on code in PR #826:
URL: https://github.com/apache/knox/pull/826#discussion_r1473933619


##########
gateway-server/src/main/java/org/apache/knox/gateway/services/factory/TokenStateServiceFactory.java:
##########
@@ -61,17 +62,32 @@ protected Service createService(GatewayServices 
gatewayServices, ServiceType ser
           service.init(gatewayConfig, options);
         } catch (ServiceLifecycleException e) {
           LOG.errorInitializingService(implementation, e.getMessage(), e);
-          service = new AliasBasedTokenStateService();
-          ((AliasBasedTokenStateService) 
service).setAliasService(getAliasService(gatewayServices));
+          service = useDerbyDatabaseTokenStateService(gatewayServices, 
gatewayConfig, options);
         }
+      } else if (matchesImplementation(implementation, 
DerbyDBTokenStateService.class, true)) {

Review Comment:
   The service loader approach is already in use by 
`org.apache.knox.gateway.services.GatewayServiceFactory`. Thus, if someone 
wants to add their own implementation without contributing here, in the Knox 
project, they can do that by overriding the existing `TokenStateServiceFactory` 
and having that custom factory inserted into the 
`org.apache.knox.gateway.services.ServiceFactory` file within their custom JAR. 
   
   However, I see that's a different discussion we should start in Knox's DEV 
e-mail list. As of now, all service implementations work that way and I would 
rather not do this work in the scope of this JIRA.
   Any objection?



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