deepyaraj commented on a change in pull request #88:
URL: https://github.com/apache/qpid-broker-j/pull/88#discussion_r645469101



##########
File path: 
broker-core/src/main/java/org/apache/qpid/server/security/group/FileGroupDatabase.java
##########
@@ -174,10 +179,27 @@ public synchronized void removeUserFromGroup(String user, 
String group)
     @Override
     public synchronized void createGroup(String group)
     {
-        Set<String> users = new ConcurrentSkipListSet<String>();
-        _groupToUserMap.put(group, users);
+        if (!isAvailable(group, _groupToUserMap))
+        {
+            Set<String> users = new ConcurrentSkipListSet<String>();
+            _groupToUserMap.put(group, users);
+            update();
+        }
+        else
+        {
+            throw new IllegalConfigurationException(String.format("Group with 
name '%s' already exists", group));
+        }
+    }
 
-        update();
+    private boolean isAvailable(String searchString,
+                                final Map<String, Set<String>> collection)
+    {
+        String groupAvailable = keySearch(collection.keySet(), searchString);
+        if (collection.get(groupAvailable) == null && groupAvailable == 
searchString)

Review comment:
       Done!
   




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