michael-o commented on a change in pull request #186: BZ 63636: 
Context#findRoleMapping() never called in RealmBase#hasRole()
URL: https://github.com/apache/tomcat/pull/186#discussion_r311490843
 
 

 ##########
 File path: java/org/apache/catalina/realm/RealmBase.java
 ##########
 @@ -928,6 +928,15 @@ public boolean hasRole(Wrapper wrapper, Principal 
principal, String role) {
             }
         }
 
+        // Check for a role alias/mapping defined on context level
+        if (getContainer() instanceof Context) {
+            Context context = (Context) getContainer();
+            String realRole = context.findRoleMapping(role);
 
 Review comment:
   So, if I understand your request properly, this should not be part of 
`RealmBase` at all, but has to be implemented in `StandardWrapper`, namely 
`findSecurityReference()` whre it queries `getParent()#findRoleMapping()` if it 
is not found in `references`?.
   
   So `findSecurityReferences()` have to be changed as well? But not 
`removeSecurityReference()`?
   
   though, `getParent()` must be still of type `Context` (`instanceof` check)?

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