thenatog commented on a change in pull request #4377:
URL: https://github.com/apache/nifi/pull/4377#discussion_r450245985



##########
File path: 
nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-administration/src/main/java/org/apache/nifi/admin/service/impl/StandardKeyService.java
##########
@@ -119,10 +119,18 @@ public void deleteKey(String identity) {
 
             // delete the keys
             DeleteKeysAction deleteKeys = new DeleteKeysAction(identity);
-            transaction.execute(deleteKeys);
-
-            // commit the transaction
-            transaction.commit();
+            Integer rowsDeleted = transaction.execute(deleteKeys);
+
+            // commit the transaction if we found one and only one matching 
user identity
+            if(rowsDeleted == 0) {
+                rollback(transaction);
+                throw new AdministrationException("Unable to find user 
identity " + identity + " to remove token.");
+            } else if(rowsDeleted > 1) {

Review comment:
       I don't believe so, however I thought it best to provide more feedback 
from the DAO. One problem with investigating this issue was that there was not 
enough information provided at this level, and was only really identified by 
accessing the actual queries to h2. By throwing exceptions for 0 or greater 
than 1, we can catch potential issues like this.




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