smolnar82 commented on code in PR #597:
URL: https://github.com/apache/knox/pull/597#discussion_r904699792


##########
gateway-provider-security-authz-composite/src/main/java/org/apache/knox/gateway/deploy/impl/CompositeAuthzDeploymentContributor.java:
##########
@@ -56,23 +59,24 @@ public void contributeFilter( DeploymentContext context, 
Provider provider, Serv
 
     Map<String, String> providerParams = provider.getParams();
     String providerNames = providerParams.get("composite.provider.names");
-    if (!providerNames.isEmpty()) {
-    String[] names = parseProviderNames(providerNames);
-    for (String name : names) {
-      getProviderSpecificParams(resource, params, providerParams, name);
-      DeploymentFactory.getProviderContributor("authorization", name)
-              .contributeFilter(context, provider, service, resource, params);
-      params.clear();
-    }
+    if (!StringUtils.isEmpty(providerNames)) {
+      List<String> names = parseProviderNames(providerNames);
+      for (String name : names) {
+        getProviderSpecificParams(resource, params, providerParams, name);
+        DeploymentFactory.getProviderContributor("authorization", name)
+                .contributeFilter(context, provider, service, resource, 
params);
+        params.clear();
+      }
     }
   }
 
-  String[] parseProviderNames(String providerNames) {
-    String[] b = providerNames.split("\\s*,\\s*");
-    for (int i = 0; i < b.length; i++) {
-      b[i] = b[i].trim();
+  List parseProviderNames(String providerNames) {
+    if (providerNames==null || StringUtils.isEmpty(providerNames) || 
StringUtils.isBlank(providerNames)){

Review Comment:
   `StringUtils.isBlank(providerNames)` is enough here. It is `null safe` and 
will also cover `StringUtils.isEmpty(providerNames)`.



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